SEA - ONT
C$ 73 Find cheap flights from Seattle to Ontario
This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Ontario departing on 22/5. 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.
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Cheap flight deals from Seattle to Ontario (SEA-ONT)
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Ontario 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.Flights from Seattle to Ontario - Travel Insights & Trends
Get data-powered insights and trends into flights from Seattle to Ontario to help you find the cheapest flights, the best time to fly and much more.
What’s the cheapest day of the week to fly from Seattle to Ontario?
If you are looking for a flight deal from Seattle to Ontario, look for departures on Mondays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from Ontario, Tuesday is the cheapest day to fly and Monday is the most expensive.
What is the cheapest month to fly from Seattle to Ontario?
The cheapest month for flights from Seattle to Ontario is September, where tickets cost C$ 226 on average. On the other hand, the most expensive months are November and April, where the average cost of tickets is C$ 329 and C$ 326 respectively.
How far in advance should I book a flight from Seattle to Ontario?
To get a below average price on the flight from Seattle to Ontario, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 53 days before departure.
Which airlines provide the cheapest flights from Seattle to Ontario?
In the last 3 days, Delta offered the best one-way deal for that route, at C$ 108. KAYAK users also found Seattle to Ontario round-trip flights on Frontier from C$ 73 and on Delta from C$ 228.
Which airlines fly most frequently between Seattle and Ontario?
Alaska Airlines connects Seattle to Ontario with up to 4 flights per day. Delta also offers 4 flights per day, while Frontier follows with 1 flight per day.
Which airlines fly direct between Seattle and Ontario?
There are 3 airlines that fly direct from Seattle to Ontario. They are: Alaska Airlines, Delta and Frontier. The cheapest price of all airlines flying this route was found with Alaska Airlines at C$ 161. On average, the best prices for this route can be found at Alaska Airlines.
How many flights are there between Seattle and Ontario per day?
Each day, there are between 9 and 11 nonstop flights that take off from Seattle and land in Ontario, with an average flight time of 2h 36m. The most common departure time is 7:00 a.m. and most flights take off in the morning. Each week, there are 71 flights. The most frequent day of departure is Wednesday, when 15% of all weekly flights depart. The fewest flights depart on a Friday.
Which cabin class options are there for flights between Seattle and Ontario?
There is only one cabin class option available for the route, which is Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.
How long does a flight from Seattle to Ontario take?
Direct flights cover the 2,477 km separating Seattle to Ontario in about 2h 30m.
What’s the earliest departure time from Seattle to Ontario?
Early birds can take the earliest flight from Seattle at 6:32 am and will be landing in Ontario at 9:05 am.
What’s the latest departure time from Seattle to Ontario?
If you prefer to fly at night, the latest flight from Seattle to Ontario jets off at 9:26 pm and lands at 11:59 pm.
When to book flights from Seattle to Ontario
FAQs for booking flights from Seattle to Ontario
Top tips for finding a cheap flight from Seattle to Ontario
Prefer to fly non-stop from Seattle to Ontario?
Find which airlines fly direct from Seattle/Tacoma Intl to Ontario, which days they fly and book direct flights.
Nonstop departures
Seattle/Tacoma Intl to Ontario
Monday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Tuesday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Wednesday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Thursday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Friday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Saturday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Sunday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Nonstop returns
Ontario to Seattle/Tacoma Intl
Monday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Tuesday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Wednesday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Thursday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Friday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Saturday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Sunday
Alaska Airlines, Delta, Frontier, +6 more
Alaska Airlines, Delta, +7 more
5
6
Top airlines flying from Seattle to Ontario
Up on arrival, due to twisted ankle, I wasn’t able to walk. Requested for a wheelchair. They immediately asked for it. After 10 minutes wait a young man named Carlos picked me up at the gate, got my baggage and took me to the pick up area. It was a great service. Thanks Alaska Air line
Up on arrival, due to twisted ankle, I wasn’t able to walk. Requested for a wheelchair. They immediately asked for it. After 10 minutes wait a young man named Carlos picked me up at the gate, got my baggage and took me to the pick up area. It was a great service. Thanks Alaska Air line
Good. Quiet. Comfortable. The protests nearly kept me from catching my flight. They waited for me! I made it!
I tried to cancel my flight weeks in advance round trip and told I was not able to. $400 down the drain
wish Airlines would board the plane starting in the back first. Makes more sense and I think it would be faster, NO? Everything else was great!
I went Premium otherwise it would have been a long wait. On board I only asked for a cup of hot water and got lukewarm. Cabin crew have poor to no service. But great flight; it went smooth.
I appreciated the check-in at SEATAC - a knowledgeable person was available. I found it easy to ask questions as I went along. I hadn't been at SEATAC for a year and was not that familiar. Parking was fine at Sacramento
My baggage arrived at the airport on an earlier flight. It would have been nice if I would have gotten a text. I waited until all the luggage had arrived before Ivwent to the baggage counter!
I had to check-in my small carry-on at the gate which was inconvenient. According to the people at the gate at SEATAC, there wasn't anymore room in the overhead bins. I obliged. But, when I got inside the aircraft, there was plenty of room EVERYWHERE! It was either miscommunication or incompetence among the Alaska personnel.
Bad. The fight was late and they gave a ridiculous $12 stipend. Better give something or nothing. $12 is ridiculous.
It was a good flight . It wasn’t a full flight so we had space to move around
Had a broken tray in business class. Crew just shrugged it off.
Everything was great except for the seat. The backrest would not stay in the upright position.
public website still broken for years randomly blocking browsers with privacy options active after loading a page maybe once. check-in on laptop was almost impossible but eventually randomly worked. had to print pass at airport since couldn't get back in to load digital pass on mobile firefox or chrome. red eye flight so smooth onboarding, plenty of room to spread out, easy offboarding. onboard wifi instructions mention vpn can cause problems connecting but fails to also mention private dns. no printed or built in menu list, seems weird to require personal device to point at qr code link for menu which does not even allow direct ordering. people with health condition risk related dietary restrictions trying to avoid for example cholesterol and sugar are left guessing what they can order either way without nutritional info highlights (cranberry juice was minute maid cocktail with as much suger as typical can of soda). tap to pay wasn't working and always seems sketchy to manually enter card info. good movie variety, so limited tv was okay.
Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.
Flight diverted in SD. Later take off in Seattle by 1.3hrs
Mi primera conexión se retrasó por lo cual perdí mi segunda conexión la cual salió adelantada
Crew was not friendly when I went to request a seat change.
There were choices for the snacks. Good choices and tasty lunch and breakfast as well.
The flight crew was amazing. I’m very tall and they moved me to an exit row unsolicited!!! Amazing service.
The boarding process was terrible especially with an indirect flight Chicago to Seattle to San Diego was terrible talking about we overbooked a flight idk if I’d take this airline ever again we got off our flight from Chicago to Seattle and we traveled for business and they told us our connecting flight was over booked and their was no seats asking people to take a delayed next flight and they don’t tell anyone coughing to wear masks seats 30A-B were terrible during the flight no one wants to sit next to people coughing all around I don’t want to be sick traveling for work or get sick anytime it’s very upsetting the staff doesn’t take this stuff serious to tell them to wear masks when they see people coughing and sneezing