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Find cheap flights from Seattle to Ontario from C$ 137

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Ontario departing on 29/5. 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.
1 adult
0 bags
Sat 25/5
Sat 1/6

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Best Ontario Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Toronto
Toronto1 stopC$ 396
Ottawa
Ottawa1 stopC$ 528
London
London1 stopC$ 656

Good to know

Low season

January

High season

July

Cheapest flight

C$ 137
Best time to beat the crowds (22% less expensive on average)
Most popular time to fly (26% more expensive on average)
Flight from Seattle to Toronto Pearson Airport

FAQs - booking Ontario flights

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

    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 Seattle to Ontario.

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

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

  • What is the Hacker Fare option on flights from Seattle to Ontario?

    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 to Ontario with an airline and back to Seattle with another airline.

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

    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 to Ontario from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Ontario

  • Morning departure is around 18% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top 5 airlines serving from Seattle to Ontario

 
Need help choosing which airline to fly with from Seattle to Ontario? 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.
8.3
EVA AirOverall score based on 1562 reviews
8.4boarding
7.9food
8.6crew
8.2comfort
8.0entertainment
Airline reviews

Fast and efficient boarding. Flight was on time. Service was very good for our long flight. First time flying with this airline and I would highly recommend.

10.0 ExcellentDamian, Mar. 2024LAX - TPE
Read more about EVA Air reviews

Fast and efficient boarding. Flight was on time. Service was very good for our long flight. First time flying with this airline and I would highly recommend.

Eva Air's Business Class is pretty decent. With the given price, I think that the food can be better.

Pleasant, comfortable, and entertaining. All told, ZERO issues with it. And sadly, so far the flight was WAY more comfortable than the hellhole that is "Lambug Beach Resort" at Badian Beach!

It was a pleasant fly with Eva Air from NYC to Taipei. The crew were friendly and the food was exceeded my expectation.

Eva air is a good airline. The seats on the way to Taipei could have certainly been more comfortable, but all in all it was a pretty good experience.

Overall the flight was what might be expected for a long haul flight to Asia in economy class. The cabin crew was attentive and the food was good. Boarding was fairly fast and easy. The one thing I found frustrating was the EVA app. It is terrible. Trying to do anything on it was almost impossible.

EVA would not help with ticket issue since they were purchased through a travel agency. Even though it was EVA ticket stock. Travel agency Budget Air didn't reissue ticket after airline change which I didn’t learn until trying to checkin on Christmas Day and there was no contact number for the agency to help. I will never use Budget Air to purchase flight again and disappointed in EVA’s refusal to help. Thankfully just under 12 hrs before departure someone from the agency was available to reissue tickets. I was starting to think we would not be flying and the stress trying to resolve was completely unacceptable.

seamless check in/ friendly staff, food is good, always love flying Eva Air

Very uncomfortable and crowded seats in economy. Flight attendant refused request to move to nearby unused seat with more legroom because “It was more money for that seat”. It was also near impossible to reach airline directly by phone. Waits upwards of an hour and not very helpful customer service representatives after long wait. Cannot recommend this airline.

My experience with Eva sir was good except the long walk in LA Lex, that was inconvenient for my age,

I commend the flight attendants on our SFO-SIN flight who went above and beyond to provide us with extra snacks and food. This type of service makes the flight experience personal and awesome.

It was a great flight Food was great Crew was spectacular

In general good, but the machine seems to be long in operation and some functions were restricted as e. g. Adjusting of seats.

Seating cramped; close to toilet, foul smelling and noisy, very unhygienic and disease risk Free and paid Wi-Fi NOT accessible at all - misleading advertising Very expensive sunglasses disappeared from back seat pouch. Coffee disgusting and cold

People were so nice! Economy seats were small and cramped feeling for me. I’m slender and 6 feet tall

The singapore airline now compared before covid, I like the service before covid. SQ was the best of all airlines but now I am going to look for different airline if I am travelling in asia.

They are great with every aspect of customer service. Helped my elderly father and aided him with using the restroom.

Due to the delay of my first flight, my connecting flight with JetBlue was canceled by Singapore Airlines, but the JetBlue crew was very accommodating and rebooked a seat for me. The crew was very nice and had good attitude.

Very slow check in. Food poor and some of the special meals offered were not available. Luggage then didnt arrive and still waiting for news 48 hours later

Check in was snails pace, only 1 of the luggage screen was working so long lines, an hour to check in Nobody seemed to want to fix the issue Flight was 45 minutes late Scoot is a mini sized plane ( sardine class plane), literally felt slammed between people

Positive: Entertainment via phone on the short was great and my first time. Good food and wine and head phones for free. Negative: Seat hardly reclined on the long flight. Breakfast was an egg with a bun. No egg choices and rather have something sweet like bun/jam and Youghurt.

Aircraft has better leg room than any of United's larger planes. We had requested mobility assistance for this and related flights. United's response to all was superb.

No snacks served! Seating in the kast row in uncomfortable.

By in large it was a good experience. The flight crew was great and that's the most important to me. Boarding was fine.

Flight was fine, it was delayed but only 30 minutes, staff were efficient, lady making announcements at LAX was really hard to understand but the rest were great.

The male air hostess was rude and didn’t even offer me a drink. Poor customer service!

We left really late. Things that were out if anybody’s control I guess.

The weather caused a delayed but I was impressed how United did everything they could to try to get us out which included bussing us to the plane doing a Hardstand and bringing us to the plane since the fog was too thick to tow the plane from the overnight stay in the cargo area.

Food was really good. Chicken curry delicious. Great service. Had 3 seats, what a pleasure. What about a healthier desert option on the dinner? Yogurt, fruit? Thankyou

When I purchased my ticket, I assumed it was a real ticket, as in, when I go to the airport I am guaranteed a seat. Not so. When I checked in 24 hours ahead of time, I noticed I did not have a seat assignment and my boarding pass said "Standby." I was informed at the gate that the flight was full and I may not get on that plane. I don't recall being offered the option of selecting a seat when I checked in, and apparently, for the honor of pre-selecting a seat, you must pay an additional fee. So, a ticket really isn't a ticket, it's actually a lottery and if you're lucky, you may make it on board - or you can choose to be extorted for extra money for the guarantee of a seat. It's like making reservations with the Godfather - one payment isn't enough, there's always another bribe you have to make. After the first few zones were called and I hadn't been informed of my status, I went to the gate agent and they handed me a boarding pass, for the very last row near the restrooms, in between two very large people. Apparently that was my punishment for not purchasing a seat ahead of time. Airline service has not only gotten more expensive, but the return on your money has shrunk and there is little regard for the passengers. This feels like a racket. I am not pleased, as you may have gathered.

Just get Economy Plus for international flights, so worth it the extra room, bigger seats…

This flight is frequently delayed. The connections seemingly are more frequently delayed. I’ve missed connections as a result twice on the same route to charlotte then Charleston. Final destination arrival has been the next day, twice in a row. No pilots, no crew. Too many excuses. Unfortunately, my days with American are over.

Entertainment was okay not because anything was wrong but it is a short flight so having no wifi is annoying but understandable. Crew was outstanding as usual

It was spectacular. I had basic Economy and was given so much space and their seats lean back so far. Staff was superb, food was superb, everything was superb, Finnair is Fantastic.

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

The Flight attendant had an attitude and didn't allow anyone any time to prepare for landing despite being absent throughout the entire trip

Flight boarded without pilots. Sat on plane for 3 hrs. after over an hour late boarding. Plane never took off. Had to deplane near midnight. Line for rebooking was 3 hours + long. I had to leave.

The flight was great but board was a nightmare. The gate was changed 4 times during the layover period

The experience was great and much better than the flight going out. of course I was in first class but the service was excellent

Cold air blew constantly on my legs almost making me numb.

Due to a strike taking place with the airline, it negatively impacted my flight in multiple ways. My flight was delayed over 2 hours and the food served was mediocre at best.

Cabin crew were great. Seats are criminal for tall people

My flight was great! Gate attendants and crew were great… pleasant and in good spirits. Flight delayed several hours and we were well informed of the status while on plane. Thank you!

The fact that I got to Toronto alive and well and safe is a huge plus. I thank the captain and crew for a safe flight The comfort of the aircraft leaves much to be desired. Human beings should not have to be that cramped and squashed on a flight that we pay a lot for and even have to pay for lousy food choices The cabin crew were pleasant and helpful Kudos to them as the flight was packed to capacity and there was a lot of work for them in a short space of time All in all a good experience, but too cramped

Overall I will say it was a very good experience. It was as comfortable as can be expected for such a long flight - 12 hours from Toronto to Tokyo. Everyone was very pleasant and polite. Even the passengers were cooperative and trying to be nice to each other. Of course the space is limited on such a long flight. The bathrooms were actually very clean. The food was very good. I liked how there was a variety of food options. The in flight entertainment system was also very impressive! There were some children on the flight but they were well behaved and hardly ever crying. Great Job Canada Air! I will definitely fly with Air Canada again!

Lost my bag. My first ever flight with them that they forced me to gate check my bag on, due to them having a 30 year old plane with small carry on bins, and they lost my bag. Never again.

The trip was fine and uneventful. The seat in business class was very uncomfortable which was disappointing given the extra cost. It was spacious but it felt like I was sitting on metal bars. The food in business class wasn't very good. The flight was ahead of time, the staff was professional and courteous and our luggage arrived safely.

Again we were late leaving Austin , there was no tv screen for the 3.5 hr flight, the pizza I bought was kinda bland

Both flights to and from Phoenix were delayed 2 hours each direction. Unacceptable. Disappointed with Air Canada I was given a food voucher fror trip to Phoenix but nothing on return. Both baggage claims took 2 hours to collect baggage

I liked Seattle but nothing air Canada did there was any good at all neither was kayak as when I purchased my flights the price I purchased at was not what kayak charged to my card and there has been no responses to my emails ....

Book cheap flights from Seattle to Ontario

Recent round-trip flight deals

9/5Thu
1 stop
18h 00mSEA-YYZ
12/5Sun
1 stop
15h 25mYYZ-SEA
C$ 396
28/5Tue
1 stop
18h 00mSEA-YYZ
22/6Sat
2 stops
16h 36mYYZ-SEA
C$ 420
10/8Sat
directUnited Airlines
4h 40mSEA-YYZ
22/8Thu
directUnited Airlines
5h 26mYYZ-SEA
C$ 628
9/8Fri
directAir Canada
4h 40mSEA-YYZ
19/8Mon
1 stopAir Canada
7h 25mYYZ-SEA
C$ 635
10/8Sat
1 stopAir Canada
9h 23mSEA-YYZ
21/8Wed
1 stopAir Canada
8h 15mYYZ-SEA
C$ 642
9/8Fri
1 stopDelta
8h 06mSEA-YYZ
22/8Thu
1 stopDelta
7h 29mYYZ-SEA
C$ 652
8/5Wed
1 stopAmerican Airlines
12h 16mSEA-YYZ
14/5Tue
1 stopAmerican Airlines
9h 11mYYZ-SEA
C$ 658
8/5Wed
1 stopAmerican Airlines
12h 16mSEA-YYZ
13/5Mon
1 stopAmerican Airlines
10h 37mYYZ-SEA
C$ 660
14/8Wed
1 stopDelta
8h 06mSEA-YYZ
27/8Tue
1 stopDelta
7h 16mYYZ-SEA
C$ 662
4/5Sat
2 stopsUnited Airlines
15h 20mSEA-YYZ
6/5Mon
1 stopUnited Airlines
18h 22mYYZ-SEA
C$ 680

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Recent one-way flight deals

29/5Wed
1 stop
18h 07mSEA-YYZ
C$ 137
24/6Mon
1 stop
29h 40mSEA-YYZ
C$ 186
10/8Sat
directAir Canada
4h 40mSEA-YYZ
C$ 283
9/8Fri
1 stopDelta
8h 06mSEA-YYZ
C$ 286
9/7Tue
directAir Canada
4h 40mSEA-YYZ
C$ 289
16/5Thu
1 stopAmerican Airlines
15h 52mSEA-YYZ
C$ 294
15/5Wed
1 stopAmerican Airlines
8h 27mSEA-YYZ
C$ 296
4/5Sat
1 stopDelta
7h 56mSEA-YYZ
C$ 312
15/5Wed
2 stopsUnited Airlines
15h 58mSEA-YYZ
C$ 382
6/6Thu
1 stopUnited Airlines
6h 33mSEA-YYZ
C$ 424

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Last minute flights from Seattle to Ontario

Last minute flight, train and bus deals

30/4Tue
multi-stopDelta
7h 54mSEA-YYZ
2/5Thu
multi-stopDelta
7h 43mYYZ-SEA
C$ 694
29/4Mon
multi-stop
30h 46mSEA-YYZ
6/5Mon
multi-stop
19h 26mYYZ-SEA
C$ 706
28/4Sun
multi-stop
30h 46mSEA-YYZ
30/4Tue
multi-stop
14h 45mYYZ-SEA
C$ 713
28/4Sun
multi-stopWestJet
51h 58mSEA-YOW
6/5Mon
multi-stopWestJet
24h 31mYOW-SEA
C$ 972
29/4Mon
multi-stopAmerican Airlines
8h 33mSEA-YYZ
15/5Wed
multi-stopAmerican Airlines
10h 55mYYZ-SEA
C$ 1,057
29/4Mon
multi-stopAmerican Airlines
8h 33mSEA-YYZ
1/5Wed
multi-stopAmerican Airlines
17h 28mYYZ-SEA
C$ 1,102
29/4Mon
multi-stopWestJet
14h 27mSEA-YOW
6/5Mon
multi-stopWestJet
24h 31mYOW-SEA
C$ 1,105
29/4Mon
multi-stopAir Canada
9h 41mSEA-YOW
6/5Mon
multi-stopAir Canada
8h 13mYOW-SEA
C$ 1,111
29/4Mon
directAir Canada
4h 38mSEA-YYZ
6/5Mon
multi-stopAir Canada
8h 12mYYZ-SEA
C$ 1,487
26/4Fri
multi-stopUnited Airlines
10h 58mSEA-YYZ
29/4Mon
multi-stopUnited Airlines
12h 33mYYZ-SEA
C$ 1,614

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Seattle - Ontario Flights

Departure:

Seattle (SEA)United States

Return flight deals:

Ontario - Seattle

Cabin classes:

C$ 4,052
C$ 308