ca.kayak.com is also available in French. Voir le site en français.

Prices are in Canadian Dollars.

Find cheap flights from St. Louis to Ontario

Find cheap flights from St. Louis to Ontario

Round-trip
Economy
St. Louis (STL)
Ontario
Tue. 26/1
Tue. 2/2
Any month
Compare vs. KAYAK |
Search hundreds of travel sites at once for deals on flights to Ontario

Good to know

Low season

June Best time to beat the crowds (3% less expensive on average)

High season

September Most popular time to fly (13% more expensive on average)

Average price round-trip

C$ 464 (avg. price over the last 2 weeks)

Good deal round-trip

C$ 213 or less

Good deal one-way

C$ 198 or less

Top tips for finding cheap flights to Ontario

  • Looking for a cheap flight? 25% of our users found tickets from St. Louis to Ontario for the following prices or less: to Toronto C$ 240 one-way - C$ 464 round-trip
  • High season is considered to be January, February and December. The cheapest month to fly to Ontario is January.

FAQs - booking Ontario flights

How long is the flight to Ontario from St. Louis?

What is the cheapest flight to Ontario from St. Louis?

How does KAYAK find such low prices on flights to Ontario?

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Ontario?

What is the Hacker Fare option on flights to Ontario?

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight to Ontario?

Top 4 airlines serving Lambert-St Louis to Ontario

Scores according to KAYAK customer reviews

7.9
Delta
Overall score based on 28,927 reviews
8.1
Boarding
7.8
Comfort
8.5
Crew
7.8
Entertainment
7.5
Food
Airline reviews

Pros: "All of it"
Cons: "Nothing Best flight"

Cons: "Really felt happy on time touch down nice journey with delta"

Pros: "Friendly crew"

Pros: "The flight landed early. Check-in staff were great."
Cons: "Boarding was a debacle. Flight was oversold. Passenger had trouble boarding when their group was called."

Pros: "The crew was amazing! The seat was comfortable."
Cons: "Used the self check in kiosk to begin! That was awesome! But after that I still had to stand in line to check in my bags. That part of the process took a bit longer than expected."

Pros: "The crew was amazing. Kat and the other stewards were very friendly."
Cons: "Maybe the option for free upgrade to first class if flight is not full??"

Cons: "Delays were unfortunate, but the gate area at LaGuardia was way too crammed, hardly any seats, and poorly organized"

Pros: "Nothing special"
Cons: "That was the most uncomfortable and cramped seat I had ever had on a plane flight. Even sitting on the pillow did not help."

Pros: "Crew was amazing."

Pros: "I like that I arrived at my destination safely."
Cons: "My allergies were bothering me due to the airlines allowing animals to travel as passengers, in this case a rabbit. I am very allergic to animals. My breathing was compromised."

Pros: "This had one of the best attendants I have encountered. She was extra friendly and made us feel good."

Pros: "Good snacks"
Cons: "Nothing"

Pros: "Everything was on time and efficient. I also liked that the captain came on and updated us on arrival, turbulence, weather, etc."

Pros: "Extra leg room was great"
Cons: "Entertainment system was flickering"

Cons: "Flight was delayed out of St. Louis causing several of us to miss our connecting flight from Salt Lake City to Portland. Delta was of very little help in assisting us in making a connecting flight. They could have at least helped with travel arrangements and provided us with a little food, a pillow and a blanket as we waited in their terminal for the next flight on their airline which was a several hour wait. I understand these things happen but the passengers didn't cause the problem and Delta needs to take care of people better if they expect to earn repeat business."

Pros: "Crew were helpful and pleasant"
Cons: "Seating was uncomfortable, cabin was cold and no blankets available, food was just ok, plane had lots of empty seats yet everyone was squeezed into 3 in a row making it uncomfortable, no updates from captain or crew as to where we were in the flight....."

Pros: "On time, great service, a lot of legroom."
Cons: "Nothing."

Pros: "Left on time all went well in Atlanta"
Cons: "Impossible to figure out what to do in Toronto at Canadian Customs. You move from secure to unsecure then back to secure. It’s a mess and nobody tells you what to do or where to go. Picture process took 4 times. Nobody tells you that you have to transfer your own bags from Delta to West Jet. I even asked in a Toronto and they said no and nobody in Atlanta told me to collect my bags. So bags never made it until the next AM. The West Jet rep was very good and located the bags and they were delivered as promised. You should provide 3 page detailed instructions on how to handle Toronto. I am a seasoned traveler by the way. I’ve never seen anything worse. I could go on and on."

Pros: "Nothing"
Cons: "We lost our whole vacation and had to pay for the plans fare twice because My last name was spelled wrong on our tickets and we were unable to use them because my passport didn’t match the name on the ticket. We had to rebook everything pay almost twice as much for the plane fare, our Lodi g cost more and our trip was delayed for two weeks. Vyama is blaming us for spelling our name wrong and claimes that it’s our fault this happened because everything is automated. There saying they don’t touch anything that we enter into the booking but somehow everything they claim we entered is now in all capital letters and the space between our first name and middle name is now gone and all run together. The coustomer service number gets you to someone in India. I have tried to get this addressed four times now at first they tried to place the responsibility on the airlines now us and they have hung up on me twice. Kayak has been worthless, they also just pass the responsibility on to someone else. We will never use them again ant I intend to make sure that this mess is put out in social media to hopefully keep others from having their travel plans ruined by their flawed system."

Cons: "Z"

Cons: "was a difficult transition from delta to west jet in Toronto and we almost missed the flight"

Cons: "They changed my flight to a different one departing 2 hours earlier and did not notify me! The original flight was still available & they would not let me take it despite my reservation paper work. CRAZY! I have a two hour drive to the airport this gave me the option to leave home at 2:30am or go the night before and pay for a hotel. Flight was managed by DELTA who also did not care! All involved blamed each other. Beware"

Cons: "Could not get the boarding pass to print at the self serve kiosk. Had to wait in line for assistance."

Pros: "Delta and Westjet staff are of great help to me."
Cons: "Not applicable"

Pros: "The staff is very friendly. Most pleasant airline I've flown with."

Pros: "On time as scheduled."
Cons: "N/A"

Pros: "Left early and arrived early."
Cons: "Smallest bathroom on a plane I've ever seen. Could barely sit down without my knees banging into door or wall."

Pros: "The flight attendant named Steven went so far beyond the call. He was attentive, he fixed our video system when no one else could and when he learned we were celebrating an anniversary he brought us a present. He was awesome!"

Pros: "In flight movies"
Cons: "The flight was 3 hours late taking off which made us miss our connection to chicago so we are stuck in Atlanta tonight with unplanned expenses we were not planning on!"

Pros: "Refurbished plane. Lighting was good"
Cons: "No TV screen"

Pros: "Very friendly crew"
Cons: "Seatbelts very short given ample seat size"

Pros: "Everything from the check-in to the landing was great. We were well informed about what was going on with out luggage (we were on a regional flight) and the assortment of free snacks were superb! I guess I'll be a returning customer"
Cons: "I was expecting some form of entertainment (radio, overhead monitor, etc) on the CRJ700. But it really don't take away from the experience since T-Mobile partnered with the Wi-Fi service and I received a free hour of Wi-Fi!"

Cons: "No space in the seats"

Cons: "My flight got to New York so late!!!! I missed my international flight."

Cons: "Not great communication from gate or staff on board. Failed to provide adequate water. No ice on super warm flight. Just bad experience overall."

Pros: "Crew"
Cons: "3 hours there before the departure."

Pros: "Spacious, clean, great host and hostesses. The flight arrived at our destination 30 minutes early."
Cons: "Nothing."

Pros: "Newer plane! Comfortable"
Cons: "Nothing just great"

Cons: "Not enough water on the flight and we landed in a parking lot and shuttled back to the airport."

Pros: "That a delta plane actually had seat back video screens- First delta flight ever that I've been on that did. But every ones screen froze up just over an hour into the flight."
Cons: "Even though the Atlanta to Toronto arrived 'early' I had barely 20 minutes to get to the other plane- I would not have made it with out the amazing staff of weather and the Toronto airport. I use a wheelchair and even zipping through as fast as I could I was 15 minutes late arriving at the gate. I booked this flight thinking I had at least and hour and a bit between flights. Thankfully others on my flight were also late so the Ottawa bound plane did not leave on time"

Pros: "When you are delayed, there is not much to commend."
Cons: "Delayed. That pretty well says it all."

Cons: "turbulance"

Pros: "The crew was good and the flight was smooth."
Cons: "Somehow we were double booked and double billed. We got to the airport 3 hours early and checked our bags. All 3 were lost and searched. Everything was put back precariously and there was shampoo and lotion everywhere."

Pros: "i love the view from the window seats and that I was able to relax and the snacks."

Pros: "Plane was comfortable"
Cons: "In order to leave airport on time (plane came in late) they claimed overhead space was full and that remainder boarding passengers had to check their bags. (Bags to be picked up in baggage claim) When walked into plane saw plenty of overhead space for carryons!"

Pros: "I was cleared for standby! Flight attendant at the stl gate is always friendly and willing to help! I love her!"
Cons: "I waited almost 6 hours on the phone the night before the flight to get on standby! Almost didn't get the flight! Was charged $50 only to not get on my next flight because it was over booked! Flight attendant was very rude!"

Pros: "I liked that I was able to get able to get an earlier flight!"
Cons: "I don't like that I had to pay $50 extra dollars for standby on both legs of my flight! I am a very loyal delta customer and these past times flying I feel like my favorite airline is turning into the bad airlines delay everytime, problems with the plane fare prices too high! I'm starting to think about taking my business elsewhere!"

Pros: "Good flight, comfortable; good food."
Cons: "Entertainment system kept failing"

Pros: "10 minutes early departure"
Cons: "There isn't enough seats in the gate area and sitting on the runway for 10 extra minutes we could have been early"

Pros: "You got us there safely."
Cons: "Not sure who is at fault for running out of de-ice solution, but keeping us sitting on the tarmac without air ventilation for almost 3 hours... with only an apology and a last minute glass of water? that was terrible customer service."

Pros: "Prompt on time service."
Cons: "N/A"

Pros: "Flight did not take place because of cancelled return flight. the whole itinerary was cancelled."
Cons: "because of cancelled flight I had to schedule a new itinerary directly through American Airlines. The cost increased from $947.50 to $1,873 plus airport parking for 17 days."

Pros: "Seats which we selected where great"
Cons: "I would have like the opportunity of moving up to preferred seating. Would be willing to purchase it"

Pros: "Great seats in first class"
Cons: "N/a"

Cons: "They changed my flight schedule that made me have to arrange my travel plan"

Pros: "Room between rows Entertainment from St Louis to Phoenix"

Pros: "We got to our destination safely, and American provided us with extra legroom seats."
Cons: "Service was curt and there was only phone-based entertainment."

Pros: "The crew was great"
Cons: "The seats were not comfortable and boarding was a pain. Not sure why you wouldn’t want to board from the back to front. Weather grounded us at our loading airport so we were stuck with the option of staying the flight or going in the lobby."

Pros: "British Airways got us on another flight to Dublin through Heathrow."
Cons: "Plane was late missed the connecting flight. Aer Lingus/American Airlines refused to help us find another flight to Dublin. I called Vagama customer service and the attended refused to help get an additional flight or confirm our returning flight would be held."

Pros: "The pilot was great. Avoided turbulence and arrived about 20min early. Easy to find seat and stow bag. Smooth takeoff and landing."
Cons: "Alaska airlines was who I thought I was riding with but the itinerary changed past min. Gate change and the airline itself was changed. Really confusing since I printed my boarding pass the night before."

Pros: "Smooth boarding. On time flight"
Cons: "No gluten free snacks:("

Pros: "On time"
Cons: "Small seats"

Cons: "No personal TV’s and no food for purchase"

Cons: "The layover was too short we missed our connecting flight. How did Kayak even allow us to book such an itinerary. Staff with the airline was also rude! Never will I book with site ever again!Rude"

Pros: "Arrived early"
Cons: "American airlines lost my bag... Customer service in LAX is non-existent."

Cons: "The cleaniless of the flight can get better"

Pros: "Flying AA. Excellent flight"
Cons: "No wifi. Pay only"

Pros: "Besides the seating problems everything else went smoothly"
Cons: "I was not able to get seats assigned to us before arriving at the gate. We got put on the very last row by no choice of our own. The seats are not designed for the average adult, possibly the worst ergonomics of any seats I've ever encountered. Extremely uncomfortable flight."

Cons: "Me 6’ 200 lb sitting in middle seat next to somebody that needed 2 seats for self (pls understand I’m not unsensetive nor prejudice just stating a fact). I requested to sit in last row (of both sides of plane that were empty but attendant said sears reserved for attendants - 2)."

Pros: "To be fair. The flight is only 50 minutes. By th time you get a drink it's time to land. It is completely unfair to the staff to have to do that. A flight like that. Have a box with a snack and some coolers that have 5 different beverages. I wouldn't even sell booze. I person can hold out for a flight that shot to get one on the connection or in the terminal."
Cons: "It's always a cramped flight. Nothing to be done except use a bigger, more spacious plane. The good thing is it's the fastest way to get to Chicago from where I lived it would take 6hrs by car."

Pros: "Spacious seats"

Pros: "Mostly friendly staff and quick flight time."
Cons: "Only half the plane got snacks and drinks. Additionally, I was forced to check my bag, which is a pretty big deal because I was connecting to an international flight and was unable to retrieve my prescriptions in all the rush to check my bag."

Pros: "everything was on tyime"

Pros: "A nonstop flight, with a friendly efficient crew, met my expectations. A crew member went above and beyond when I asked for a coffee stirrer with my coke and ice."
Cons: "I've been spoiled by another airline's access to screens on the back of the headrest. I have my own hand held devices to entertain myself instead."

Cons: "Delayed a total of four hous!"

Pros: "Flight was on time, staff was friendly and boarding was organized."
Cons: "I'm a small person (5'-2", 105lbs) and I didn't have room to breathe in that tiny little seat."

Pros: "JAL is customer oriented and it's always a pleasant experience. Unfortunately, though the return trip is also JAL, the cabin crew isn't."

Pros: "Boarding was good, Good flight , good service , plane was small for the distance with limited space for movement ,"

Cons: "No food or beverages for me. I slept comfortably on my flight"

Pros: "The crew was attentive and boarding went smoothly. The seat had more room under the seat in front of me, my purse was not jammed in."
Cons: "I hate paying extra for almost every seat on the plane. It's a con job. Food selection was terrible. If I'm paying anyway, give me better choices. No monitors in plane at all. Entertainment needs to be viewed on a tablet or laptop of some sort."

Pros: "I don't know how airlines get away with all the stipulations and regualations they have in the buying process there is. Otho g I like about the scam artist they are"
Cons: "The fact they they can just make it a policy and then because the employees have to have a job and enforce it blows my mind. 200 dollar transfer fee plus the difference in the ticket when it's over two weeks in advance. You people are scam artist"

Pros: "Plenty of leg room no entertainment so I dozed."
Cons: "People stuffing oversized bags in overhead."

Pros: "The movies"
Cons: "No Food"

Pros: "One I love free sodies and two I love free sodies with a smile. I definitely got both with this flight crew."
Cons: "Not enough sodies and I couldn't smell my own farts."

Pros: "Frankly there isn't much to say here. After 7 flights in 2 weeks there was only 1 flight with great staff that actually cared about the customers and looked like they enjoyed their job. The rest treated guests with indifference at best."
Cons: "Customer service is dreadful, the planes are so old they still have cigarette lighter charges in first (but of course no adapters), no food/snacks of any significance, and they seemingly cancel flights at a whim with basically no staff to help re-book the lines of guests that have been disrupted. I pity those who loose luggage AA baggage services are flooded with lost baggage they just don't care any more. Seriously its embarrassing how little they care about customer service."

Cons: "We were delayed for 4 hours, due to a mechanical issue. We were not given any forms of reimbursement. I would like a 500.00 voucher."

Cons: "Flight was delayed."

Pros: "My business class seat was comfortable"
Cons: "4hr boarding delay and no entertainment system whatsoever on a 6hr flight."

Cons: "Would be nice to know ahead of time if flight is equipped with an in seat television so as to be prepared to bring headphones."

Pros: "We arrived safe."
Cons: "Departure 1.5 hours late. Missed connection. Travel took 16 hours instead of 6 hours."

Pros: "All great."

Cons: "Still in the waiting room waiting for this flight"

Pros: "Everything was timely."
Cons: "No complaints"

Pros: "I was very pleased that the attendant gave me a free drink since I had a military ID. It was very kind of her."
Cons: "The flight was delayed multiple times. We were never informed as to why this was. It was very frustrating since I had a connecting flight into Tucson from Dallas. I got off the plane with twenty minutes to get to my next flight which was not in the same terminal. The plane was also incredibly hot while we waited to take off, I was beginning to become uneasy and nauseous."

Pros: "Zero of it"
Cons: "The fact they cancelled this flight for no reason, didn't contact me at all even though they had all of my information and than barely tried to re book me. They wanted me to take 3 connecting the flights the next day. And the next flight I was able to get on 24 hours later, I almost wasn't allowed to check in because they couldn't find my reservation."

Pros: "Airplanes are newer with onboard entertainment of all sorts for both adults and kids alike. Seats are comfortable Checking in was a very quick easy process"
Cons: "Nothing"

Pros: "see top review"
Cons: "see top review"

Cons: "they refused to provide accommodation or any reasonable flight alternate. they showed no urgency or any decency to help me. i will avoid this airline as much as possible in the future"

Pros: "Easy and fast flight :)"

Pros: "Flight from STL to YYZ was unremarkable, which isn't a bad thing when it comes to air transportation. Bit of a delay leaving, waiting for de-icing trucks to show up and do their work, but I'm not sure that's Air Canada's fault."

Cons: "I booked this particular flight because it was the shortest route available. But the Air Canada flight from Dallas was delayed for an hour and then we experienced computer problems causing further delays. I therefore missed my connection in Toroto and was told by the ground staff I could only get out 2 days later. I was also told there were no hotels available. There were long lines of angry people complaining, and they were from different flights, One couple complained they missed 2 days of their honeymoon. The plane did have seats in business class which they refused to hand out. Eventually they found me a hotel and redirected me through Frankfort the next day. It turned out to be a 27 hour trip. Huge disappointment."

Cons: "No entertainment"

Cons: "We took off 1 to two hours late"

Pros: "Empty plane"

Pros: "Left on time"
Cons: "Didn't pick up dinner trays, when they passed out breakfast, one lady didn't bother to hand out the napkin or the bottle of water to people, while the lady going down the other aisle did. Greasy pice of cake and no napkin, and a red eye flight and no water? I saw them on the cart, I guess it was just too much work to hand them out!!!"

Pros: "An Air Canada rep over the phone"
Cons: "Gate agent, zero entertainment (and no warning that we should download an app inside airport), poor food, flight attendant wouldn't bring coffee to us (made us go to the back)"

Pros: "We actually arrived alive."
Cons: "We arrived into London so late that we were forced to take a taxi at a huge expense. During the 3 hr delay the only food provided was a small bag of pretzels and water."

Cons: "Misinformation on baggage allowance for Tango flights."

Pros: "Very cool service, nice, modern aircraft, entertainment system"
Cons: "Small leg space in economy"

Cons: "We almost missed our connection and no concern, communication, or assistance from crew. They should allow close timed flights priority thru process."

Cons: "I was not able to board this flight. And it was such a disappointment and a shocking first for me. I reached the airport and on being checked at the counter, I was told that I cannot board because I don't have a Canadian visa. It was shocking to learn that I needed visa for a 1.5 hour layover. The website should give a prompt or should share the requirements. And all my ticket money got wasted."

Pros: "On time"
Cons: "Food , uncomfortable ,"

Pros: "Everyone was very courteous to us. Very little turbulence on trip. Flying is very easy today more than Even 5 years ago. I will fly again on Air Canada"
Cons: "Small basic meals"

Cons: "Pushed call button twice as I could not get entertainment system in business class to work, never came"

Pros: "The crew was really nice."
Cons: "The didn't include a meal or any wine/beer as most international flights do."

Cons: "Staff was useless. Made all international connections via my cell phone."

Pros: "I thought the crew was friendly."
Cons: "The seats were incredibly small and uncomfortable. No snacks were offered."

Pros: "At least there was food tho only banana bread for breakfast"
Cons: "No movies or entertainment for overnight flight"

Pros: "I enjoyed the entertainment option."
Cons: "Wish there were more choices for new movies."

Pros: "Quick flight, well-done!"

Cons: "Flight was cancelled and they did not bother to inform us! Ended up flying on United and arrived 6 hours later than planned."

Cons: "Flight delayed. Attendant told us to come back tomorrow and we could get on the same flights just a day later. Really?? not that stupid. Had problems getting a room overnight - management said we weren't in the system. Gentleman at air canada desk very rude - even told his partner in front of us he couldn't stand this part of his job."

Cons: "Short movie list"

Cons: "Flight was great. Kayak was a nightmare to work with."

Cons: "The fight itself was fine. Not great. Not terrible. But the airline lost my son's suitcase and has been entirely unhelpful ever since then. Now we have been stuck in a foreign country without clothes and toiletries for 36 hours and Air Canada's "helpline" has been anything but helpful. They can not find any information on the location of the suitcase and hope that they will find it in another 48 hours. Rediculous!! I will never fly them again and suggest that you save your money, effort and vacation by flying with another airline."

Pros: "Decent flight"
Cons: "Delays are part of travel, but they're ridiculous and I am unhappy with the delay leaving Minneapolis. It caused all sorts of problems down the line because it caused me to miss my connection, take different flights, and come into Munich much later than I had expected. Also, you Canadians don't have Sudoku in your magazines. Why?"

Pros: "How quick it waz"
Cons: "How close the seats were"

Pros: "All services and most of all excellent customer services."

Pros: "Friendly crew. Very smooth flight. Easy to navigate terminal."
Cons: "Nothing!"

Pros: "Leg space, arrival on time"
Cons: "Had to pay for food and cheap earbuds"

Pros: "Airplane was clean and crew was nice."

Pros: "Glad for this new route. Will make Europe easier to access from PDX."

Pros: "Plane arrived pretty much on time. Boarding was uneventful."
Cons: "Plane too low to use jetway at Pearson. Epic walk from US gates to immigration. Insufficient leg room if you're over 5'10", but that's how it is these days."

Pros: "I liked the way they handled the rain delay. Although inconvenient, they were transparent with the process"
Cons: "The lack of certainty whether we were removed or stilling our connecting flight to delay."

Pros: "Schedule ok"
Cons: "Pitch was miserable Attendant said bit was a low cost carrier so no tv in seat We are over 6 feet so never again"

Cons: "The flight needed canada transit visa and you guys dint even said me. Moreover when I contacted vayama as my bookings were proceeded by them even they dint helped me and then I had to cancel my ticket. I expect you to refund my money because of your fault I could not board the flight and had a horrible experience"

Pros: "On time good staff"

Pros: "Entertainment"
Cons: "Legroom - amazingly cramped, and I'm only 5'10""

Pros: "Bos->Toronto Good Air Canada at Boston Logan airport has there own gate area with only 3 gates. This reduces the security line for faster security check. However this also causes problems with PreCheck. See below."
Cons: "Bad There is only one line for security at Air Canada Boston Logan because of the small volume at this check point. Because of this, PreCheck passages need to hold onto there bording pass as they go through security. The first security person who checks ID and boarding pass only told my wife not to take off her shoes. He did not tell her to hold on to her boarding pass, so she put it into the bin for x-ray stuff. So later security personnel then told her to take off her shoes and gave her a body scan because her boarding pass was already in the x-ray machine. I always hold on to my boarding pass thru security but had to take my computer out of my carry-on."

Cons: "No complimentary snacks and all available food extremely expensive. Would not use this airline again if others were an option."

Pros: "Movies were great."
Cons: "Having to pay extra for a window or an aisle seat."

Pros: "Good flight and on time."

Pros: "The crew was good!"
Cons: "I wished that there were opportunities given for beverages. I also would have liked more explanations on how to connect to the entertainment."

Pros: "We checked in late and therefore weren't able to get seats together. At the ticket counter, we asked to get put together and were able to get these seats."
Cons: "As with all coach seats, they were cramped."

Pros: "Free snack"

Cons: "Very crowded, small seating and legroom"

Pros: "I will fly Air Canada again but will probably drive to Toronto to catch a plane, rather than take the connecting plane out of my own city.There's a Tim Horton's at the airport!"
Cons: "Flight from our small city was late leaving and we didn't find out about the delay until close to the take off time. The reason given to us was that there was too much air traffic in Toronto. Couldn't this have been planned better? Not the fault of Air Canada."

Cons: "Even though this flight was operated by CA and booked through Ethiopian, they would not honor my two checked bags. However, the guy behind me - also going to Ethiopia - they allowed two checked bags, no charge. I always feel like they aren't willing to budge or look up the rules or even just be nice about baggage. I'd rather not give any more $$ for baggage that i'm actually allowed."

Cons: "Over 1 hour waiting on phone and disconnected. Terrible. Check-in people didn't even say one single word of apology. they suggested call Air Canada."

Pros: "Crew worked hard under difficult circumstances but flight was not well equipped"
Cons: "First we boarded and then had to deviate and move to a different delayed flight. No head sets, tv did not work , seat was very uncomfortable."

Cons: "Roomier Seats more isle space and comfortable seating. Better head sets"

Pros: "The customer service wait is extremely long especially when u get hung up on and start all over . But one man was very helpful in changing to accommodate me next day"

Pros: "Despite delays the captain was communicative and gracious."
Cons: "Only one person was at the gate checking passports on a full flight so embarking took a very long time, making us late. Entertainment system was pay-only and the screen couldn't be turned off so we had ads flashing brightly in our faces the whole trip."

Pros: "Everything was excellent! I even got upgraded to a window seat!"

Pros: "My wife was happy"
Cons: "Fixing my own supper"

Pros: "Service was excellent"

Pros: "Attendants were friendly"
Cons: "They could not find our flight in their system which was very nerve wracking."

Pros: "That I didn't have to walk to Fargo. I wasn't dragged off a plane."
Cons: "3 flights to Fargo were cancelled. I was told I would not get to Fargo until 32 hours after my original time I was suppose to land in Fargo. After spending a fair amount of time on the phone with customer service I was able to get me on a Flight to Minneapolis that did not arrive till 1:30am then had to take a rental car to drive 3.5 hours to make it to my destination. I was not compensated for any of this. My return flight from Fargo to St. Louis was also Delayed. Both from Fargo and from Chicago. I have never experienced such poor scheduling from an airline or as many delays or cancelled flights in just a few day period."

Cons: "Never on time"

Pros: "Flight was smooth and comfortable. Flight attendants were kind and courteous."
Cons: "The speaker system was a little loud when announcements were made."

Pros: "Smooth and positive communication."

Cons: "Late by almost an hour"

Cons: "No seatback screens."

Cons: "For the second time in a row, the Houston Airport crew did not transfer the luggages to Air Canada."

Cons: "."

Pros: "Seats felt roomy, in comparison to many other regional planes."
Cons: "Vinyl seats made my back really sweaty on a relatively short flight."

Pros: "Everything was smooth"

Pros: "Greg care and service from those stationed on board."

Cons: "Very long walk from aircraft to immigration"

Pros: "Crew members were awesome and very attentive both at the airport and on board."

Cons: "Flight was delayed for 2 hours"

Cons: "Flight was delayed. Time was posted at gate for new time. Went to get dinner and when we returned to gate saw that the time had been moved UP from previous anouncement and practically missed our flight."

Pros: "Professional staff, landed safely, the NY skyline is gorgeous"
Cons: "Had to get on a later flight, TSA sucks as usual, I'm too tall for that plane"

Pros: "Had own entertainment did not use however like the app availability. Considering all of the weather delays I am very impressed and happy with service."
Cons: "Unfortunately there were no hot beverages, but cold were served."

Pros: "Fast"
Cons: "Small plane"

Pros: "Download the United app, it makes the flight better."
Cons: "Na"

Cons: "Flight was delayed so long I missed my connecting flight and spent 18 hours traveling rather than 8."

Pros: "Snacks"

Pros: "Crew"
Cons: "Seating...loudness..cost of beverages..getting/storing baggage. Aesthetics"

Pros: "For the most part the ride was nice."
Cons: "Seats were so small"

Pros: "Crew were all friendly and trip went very smooth in the air. Havent flown for years so computer checkins were a bit overwhelming at first but staff again very helpful. thanks for a great experience Mildred Johnson"

Pros: "Because of a 10 minute fix, we had to wait an additional 40 minutes for paperwork. I missed my connecting flight because of this."

Cons: "Flight was 1 1/2 hours late departing!"

Pros: "Friendly few, clean plane, and on time"
Cons: "It was way too hot on the plane. I understand it's hard to find a happy medium with people on temperature but this flight was too warm, especially with people traveling with winter wear on."

Pros: "Flight was on time"
Cons: "Check in was terrible"

Pros: "Legroom was a bit tight."

Pros: "Empty plane do had lots of space. Super comfortable."

Pros: "I'm always comfortable when riding UA. The staff is professional and helpful!"

Pros: "Easy"

Pros: "The boarding process went smoothly and was on schedule."
Cons: "Overhead compartment filled up and it was hard funding space for my bag."

Cons: "The delay. It was approximately a 2 hour delay getting to Arcata."

Pros: "Wifi on flight"

Pros: "New (to me) lime sparkling soda And a cookie too! Seemed to be a little more seat and leg room."
Cons: "I only wish your branded credit card did not cost$95.00 after first year."

Cons: "Code share between United and Air Canada, operated by Mesa. Many troubles finding the correct website. Confirmation number changed once. Terminal changed twice while we were at IAH. 1 hour late taking off, 45 minutes late landing. Missed connection in Toronto. Bags showed up in Toronto 2 hours after landing."

Pros: "Rain delayed our take off but most of the time was made up. No complaints!"
Cons: "Forced to check our carry on suitcase even though there was plenty of room above the seats."

Pros: "Newer plane,"

Cons: "Late out of Stl. Missed flight out of Chicago"

Pros: "The bigger seat and more room"
Cons: "Flight attendants not walking around and pick up the trash. I had to take the trash back to the garbage. I saw the ladies just chatting in the back."

Pros: "On time. Quick boarding, very efficient."
Cons: "Stewardess was a little grumpy."

Read more about Delta
COVID-19 information

Safety measures for airlines flying from St. Louis to Ontario

Airlines flying from St. Louis to Ontario have enacted additional safety measures and adjusted policies to better accommodate travellers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from St. Louis to Ontario

Mandatory masks

Masks required on board, masks provided on flights from St. Louis to Ontario

Social distancing seating

Middle seats unavailable to book on flights from St. Louis to Ontario

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from St. Louis to Ontario

Book cheap flights from St. Louis to Ontario

Recent round-trip flight deals

10/3
Wed.
1 stop
Multiple Airlines
4h 55m
STL - YYZ
24/3
Wed.
1 stop
Multiple Airlines
4h 38m
YYZ - STL
13/3
Sat.
1 stop
United Airlines
4h 35m
STL - YYZ
21/3
Sun.
1 stop
United Airlines
4h 38m
YYZ - STL
21/4
Wed.
direct
Air Canada
2h 03m
STL - YYZ
24/4
Sat.
direct
Air Canada
2h 09m
YYZ - STL
15/5
Sat.
2 stops
Delta
11h 11m
STL - YYZ
23/5
Sun.
1 stop
Delta
9h 22m
YYZ - STL
21/6
Mon.
1 stop
American Airlines
5h 17m
STL - YYZ
27/6
Sun.
1 stop
American Airlines
6h 04m
YYZ - STL
10/3
Wed.
1 stop
Multiple Airlines
6h 06m
STL - YYZ
24/3
Wed.
2 stops
Multiple Airlines
7h 49m
YYZ - STL
21/4
Wed.
1 stop
United Airlines
3h 55m
STL - YYZ
24/4
Sat.
direct
United Airlines
2h 09m
YYZ - STL
13/3
Sat.
2 stops
Air Canada
9h 41m
STL - YYZ
21/3
Sun.
1 stop
Air Canada
14h 29m
YYZ - STL
21/4
Wed.
1 stop
United Airlines
3h 55m
STL - YYZ
24/4
Sat.
direct
United Airlines
2h 09m
YYZ - STL
26/3
Fri.
2 stops
Air Canada
7h 14m
STL - YYZ
4/4
Sun.
1 stop
Air Canada
9h 34m
YYZ - STL
21/4
Wed.
1 stop
United Airlines
3h 58m
STL - YYZ
24/4
Sat.
1 stop
United Airlines
5h 02m
YYZ - STL
12/2
Fri.
1 stop
United Airlines
4h 44m
STL - YYZ
19/2
Fri.
1 stop
United Airlines
4h 08m
YYZ - STL
12/2
Fri.
2 stops
Air Canada
6h 44m
STL - YYZ
19/2
Fri.
1 stop
Air Canada
11h 43m
YYZ - STL
22/4
Thu.
2 stops
Delta
6h 28m
STL - YXU
24/4
Sat.
2 stops
Delta
6h 50m
YXU - STL
12/2
Fri.
2 stops
Air Canada
6h 44m
STL - YYZ
19/2
Fri.
2 stops
Air Canada
8h 12m
YYZ - STL
15/5
Sat.
2 stops
Delta
11h 11m
STL - YYZ
23/5
Sun.
2 stops
Delta
10h 06m
YYZ - STL
15/5
Sat.
1 stop
Multiple Airlines
9h 04m
STL - YYZ
23/5
Sun.
direct
Multiple Airlines
2h 07m
YYZ - STL
11/4
Sun.
2 stops
Delta
9h 13m
STL - YXU
15/4
Thu.
2 stops
Delta
7h 39m
YXU - STL
15/5
Sat.
1 stop
United Airlines
3h 39m
STL - YYZ
23/5
Sun.
1 stop
United Airlines
12h 50m
YYZ - STL
21/6
Mon.
1 stop
Multiple Airlines
4h 59m
STL - YYZ
27/6
Sun.
direct
Multiple Airlines
2h 07m
YYZ - STL
Show more results

Recent one-way flight deals

5/2
Fri.
1 stop
United Airlines
4h 47m
STL - YYZ
5/2
Fri.
2 stops
Delta
7h 13m
STL - YYZ
5/2
Fri.
3 stops
Multiple Airlines
21h 47m
STL - YYZ
-
1
  • Round-trip
  • One-way
  • Multi-city
  • Trip Builder
  • Economy
  • Premium Economy
  • Business
  • First
  • Multiple
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First
Economy
  • Economy
  • Premium Economy
  • Business
  • First