C$ 281 Find Cheap Flights from Ottawa to Illinois – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ottawa to Illinois departing on 10/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Cheap Flights from Ottawa to Illinois

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ottawa to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ottawa to Illinois

Thu, 15 Oct - Wed, 21 Oct
Multiple Airlines Logo
6:55 a.m. - 2:35 p.m.
YOW
-
ORD
8h 40m
1 stop
Multiple Airlines Logo
7:00 a.m. - 12:54 p.m.
ORD
-
YOW
4h 54m
1 stop
C$ 522Multiple Airlines
Mon, 31 Aug - Sat, 5 Sep
Multiple Airlines Logo
7:00 a.m. - 12:50 p.m.
YOW
-
ORD
30h 50m
1 stop
Multiple Airlines Logo
7:00 a.m. - 12:54 p.m.
ORD
-
YOW
4h 54m
1 stop
C$ 532Multiple Airlines
Sat, 31 Oct - Wed, 4 Nov
United Airlines Logo
6:00 a.m. - 11:00 a.m.
YOW
-
STL
6h 00m
1 stop
United Airlines Logo
5:00 a.m. - 9:16 p.m.
STL
-
YOW
15h 16m
1 stop
C$ 535United Airlines
Wed, 16 Sep - Thu, 17 Sep
United Airlines Logo
6:00 a.m. - 3:38 p.m.
YOW
-
STL
10h 38m
3 stops
United Airlines Logo
6:55 p.m. - 9:56 a.m.
STL
-
YOW
14h 01m
2 stops
C$ 537United Airlines
Fri, 4 Sep - Mon, 7 Sep
Porter Airlines Logo
8:00 a.m. - 2:35 p.m.
YOW
-
ORD
7h 35m
1 stop
Porter Airlines Logo
7:00 a.m. - 12:54 p.m.
ORD
-
YOW
4h 54m
1 stop
C$ 537Porter Airlines
Tue, 1 Sep - Sat, 5 Sep
Porter Airlines Logo
8:00 a.m. - 11:00 a.m.
YOW
-
ORD
4h 00m
1 stop
Porter Airlines Logo
11:45 a.m. - 7:09 p.m.
ORD
-
YOW
6h 24m
1 stop
C$ 548Porter Airlines
Thu, 20 Aug - Sun, 23 Aug
American Airlines Logo
8:40 a.m. - 2:20 p.m.
YOW
-
ORD
6h 40m
1 stop
American Airlines Logo
8:09 a.m. - 2:55 p.m.
ORD
-
YOW
5h 46m
1 stop
C$ 559American Airlines
Fri, 28 Aug - Sun, 30 Aug
Air Canada Logo
9:00 a.m. - 2:02 p.m.
YOW
-
STL
6h 02m
1 stop
Air Canada Logo
8:55 a.m. - 3:10 p.m.
STL
-
YOW
5h 15m
1 stop
C$ 561Air Canada
Thu, 20 Aug - Sun, 23 Aug
American Airlines Logo
8:40 a.m. - 2:20 p.m.
YOW
-
ORD
6h 40m
1 stop
American Airlines Logo
8:09 a.m. - 2:55 p.m.
ORD
-
YOW
5h 46m
1 stop
C$ 561American Airlines
Fri, 14 Aug - Fri, 21 Aug
Air Canada Logo
4:00 p.m. - 8:24 p.m.
YOW
-
STL
5h 24m
1 stop
Air Canada Logo
8:55 a.m. - 3:10 p.m.
STL
-
YOW
5h 15m
1 stop
C$ 565Air Canada
Booking Insights

KAYAK's insights & trends for Ottawa to Illinois flights

Get data-powered insights and trends into flights from Ottawa to Illinois to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest Ottawa to Illinois flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Illinois from Ottawa found in the last 5 days was to Chicago, at C$ 494 round-trip. The most popular route is from Ottawa (YOW) to Chicago O'Hare Intl Airport (ORD), and the cheapest round-trip airline ticket found on this route in the last 5 days was C$ 494.

What is the cheapest time of day to fly to Illinois?

The average price for all round-trip flights from Ottawa to Illinois depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Illinois is generally in the evening, when round-trip flights cost C$ 750 on average. Morning departures are around 14% more expensive than evening flights, on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is C$ 857.

Can I save money by flying with a layover from Ottawa to Illinois?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at C$ 803 on average.

What is the cheapest month to fly from Ottawa to Illinois?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ottawa to Illinois, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ottawa to Illinois is August, when tickets cost C$ 186 (return) on average. On the other hand, the most expensive months are January and May, when the average cost of round-trip tickets is C$ 765 and C$ 640 respectively.

What’s the cheapest day of the week to fly from Ottawa to Illinois?

The average price of all round-trip flights from Ottawa to Illinois clicked on KAYAK for each day over the last 12 months.

When flying from Ottawa to Illinois, you should consider leaving on a Saturday and avoid Mondays if you are looking for the best rates. For your return to Ottawa, you’ll find the best rates on Mondays and the most expensive ones on Tuesdays.

Good to know

Low seasonJanuary
Cheapest flightC$ 281
Best time to beat the crowds but there is an average 69% increase in price.
Most popular time to fly and prices are also 17% lower on average.
Flight from Ottawa to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Ottawa to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ottawa to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ottawa to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ottawa to Illinois is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ottawa to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Ottawa to Illinois with an airline and back with another airline.

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

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ottawa to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Ottawa to the following destinations at these prices or less: Chicago C$ 502 one-way - C$ 698 round-trip

Reviews of the top 3 airlines flying from Ottawa to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Ottawa to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ottawa to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
Porter AirlinesOverall score based on 442 reviews
7.5Food
8.6Crew
6.9Entertainment
8.2Boarding
7.9Comfort
Airline reviews

Look, I understand that Kayak doesn't know I cancelled my flight on Porter. So I didn't actually fly yesterday. My main disappointment is with Porter ticket fare policies, and maybe you can pass this on to them: At my employer's request, I had booked a full fare ticket with no change fees since my trip to Toronto would likely be extended. Indeed, when I went to change my flight home to a later date, I was told the Fare Difference would cost an additional $550. So much for no change fees lol! While I had the agent on the line, I hopped over to Kayak, searched for new flights on the date in question, and saw a one-way ticket that got me home for only $355. So I got reimbursed about $450for the unused half of my roundtrip and bought a new ticket for $355. What good is a full fare / no change fee ticket if they screw you with "fare difference" BS. I'm still flying home on Porter Airlines but they just lost a hundred bucks with their stupid shenanigans.

4.0 OkayJeff, Jul 2026
YYZ - SFO
Read more Porter Airlines reviews

Look, I understand that Kayak doesn't know I cancelled my flight on Porter. So I didn't actually fly yesterday. My main disappointment is with Porter ticket fare policies, and maybe you can pass this on to them: At my employer's request, I had booked a full fare ticket with no change fees since my trip to Toronto would likely be extended. Indeed, when I went to change my flight home to a later date, I was told the Fare Difference would cost an additional $550. So much for no change fees lol! While I had the agent on the line, I hopped over to Kayak, searched for new flights on the date in question, and saw a one-way ticket that got me home for only $355. So I got reimbursed about $450for the unused half of my roundtrip and bought a new ticket for $355. What good is a full fare / no change fee ticket if they screw you with "fare difference" BS. I'm still flying home on Porter Airlines but they just lost a hundred bucks with their stupid shenanigans.

I flew with Porter yesterday and overall had a positive experience. The flight was delayed, but the airline did a good job keeping passengers informed with frequent updates throughout the process. My biggest challenge was actually in Terminal 3, where the speaker system wasn’t very clear. It was often difficult to hear the announcements, which made it harder to follow updates at the gate. On board, the experience improved significantly. The aircraft felt very new and well maintained, and the seats were surprisingly comfortable for a short-haul flight. One of the flight attendants seemed a little disengaged, but the other was excellent—friendly, professional, and a pleasure to interact with. Despite the delay, the comfortable aircraft, clear communication from Porter, and positive onboard service made for a good overall experience.

It was okay. Had a thing with the front desk, she had me repack my suitcases to have them be under the weight restrictions, but then the other one was overweight, she argued with me about it when there were tons of people in line. Wasn’t great.

Organization and the adjusted times but the snacks could be of a bigger portion

Our flight was delayed by a bit. I appreciated that we were kept informed on why periodically. Boarding was fine. I overheard one flight attendant sounding very rude to a passenger who was not paying attention to the safety demonstration. The snacks were minimal as it was a short flight. There was no entertainment. Overall the flight was good back to LGA.

The check-in staff, boarding staff, and flight crew were all very friendly. Really miss the Porter lounge in Ottawa.

Due to mechanical problems it was delayed causing problems the actual flight. Was fune

Delayed by 2.5 hours. This happened previously on my flight from YOW to YVR on Dec. 26.2023. This is a terrible airline. The reason was there was lack of ground crew. This is a known event. AVOID PORTER AIRLINES IF YOU CAN. There is a reason half the plane was empty.

Flight Ottawa to Toronto canceled and no crew was available to direct me on what to do. I opened a file and I wait to be compensated.

Porter, like most airlines, need to improve their baggage policies. In reality, there are no longer 'cheap flights' because passengers pay exorbitant baggage fees.

Crew were welcoming, accommodating and they worked hard to find places for all carry on.

very average service no complimentary alcoholics drinks unlike other airlines such as Porter airlines No decent seats available during check-in time the day before

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

My flight was delayed about 1 1/2 hours in Chicago, but other then that it was a good flight.

lots of delays the crew were unclear about where to pick up my carry-on, which they took from me to check in on the plane.

My connecting gate in .Chicago was across the aisle from my arriving gate. Otherwise I would not have made my connection. So that was very fortunate.

My flight was delayed by a whole day, so I lost a day of my vacation.

Wifi wasn't working on one of the UA flights after boarding.

Crew was not very helpful. They forgot to serve me coffee and had to wait for a long time.It looked as if they were not very happy with what they were doing.

Great crew, friendly. Found the trip long just sitting with no onboard entertainment

The flight was good. My luggage didn’t land with me when I arrived in Columbus. So grateful I was able to get my luggage back within the 2 hours😍👍.

It was out first time flying Air Canada and it was ok, comfort-wise. I hope airlines are able to get a quiet room installed for young children flying. Screaming and crying the whole time in business class is quite unfortunate. That was the only thing that really messed up the experience.

Staff were very friendly. Plane left on time and arrived on time.

The Flight Attendant was particularly helpful to my wife, who was having a bad day.

It is air Canada so leaving 20 minutes late is very acceptable

One United employee a little impatient, also on flight WiFi was out for some time. I was happy to receive a complimentary alcoholic beverage for volunteering to check my carry on bag.

Everything was great, staff, planes, at the gate. All around everything was a pleasure flying .

I COULD NOT GET ON THE FLIGHT BECAUSE THE AIR CANADA CHECK-IN STAFF COULD NOT CHECK ME IN NEITHER COULD THEY DIRECT ME TO THE ALTERNATIVE CHECK-IN AIRLINE I DIDN'T FLY AND HAD TO REBOOK ANOTHER AIRLINE, PORTER FOR THE FOLLOWING DAY. I NEED MY REFUND FOR THE RETURN LEG

When a person pays 500 $ for one way ticket that person should have better seat not the seat before the bathrooms.🤔🤨

Seating is very tight. We were delayed 90 minutes to board, because the flight crew were late

Everything you need to know for your flight from Ottawa to Illinois

Information on your arrival and departure airports