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Find cheap flights from Seattle to Ontario from $78

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 6/11. 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
Wed 6/5
Wed 6/12

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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 stop$218
Ottawa
Ottawa1 stop$485
Thunder Bay
Thunder Bay1 stop$433
Timmins
Timmins1 stop$669

Good to know

Low season

February

High season

August

Cheapest flight

$78
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly and prices are also 5% lower 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 12% 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 1538 reviews
8.6Crew
8.0Entertainment
7.9Food
8.4Boarding
8.2Comfort
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,

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

The ride was good but no food ot entertainment hence, it was just over an hour flight.

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

Again, multiple delays and I eventually just canceled and drove!

Great crew. Very comfortable business seats with nice bedding. Good food. We were delayed to let late passengers on the flight, but otherwise great experience.

Great crew. We were delayed so that late passengers could get on the flight. Love the bedding in business class. Good food. Great experience.

The CX617 from HK to BKK was delayed more than 1.5 hours.

Horrible - they lied to me about baggage & boarding, even though I specifically spoke to their agents the day before my flight about my issue. When I showed up they did not let me board and stranded me at my airport until I bought a new flight with money I did not have to spend.

I was in business class. There was an excellent headset. But half an hour before arrival they collected them! The rest of the trip I had to use a cheap earphone. There must be a better way to protect the headphones.

All four American Airlines flights I took in last seven days were delayed. Caused me loads of problems, missed meetings, loss of time and money.

American cancelled our flight home. Zero option for hotel, alternative transportation and took 3 hours to find our bags so we could take a 3 hour UBER ride home on our dime. Never flying AA again.

They gave my seat away although it was a connecting flight with them and the flight was a bit delayed.

Flight was cancelled had to move to another gate late again no internet paid for the month and never can use it waste of money

You do not have a space for flight cancelled. BUT!!! Air Canada handled it great. Was booked on another airline for the next day. The original flight was booked solid. But he precheck by the maintenance found a mechanical problem and the plane was not safe to fly. It was an inconvenience to have to wait until next day but I would rather arrive safely.

Very good other than we have to wait for one crew and we’re delayed and the pilot and his co- pilot has to make a difference to be right on time arrival. Disappointed about no food service also.

I had written all my complaints on my trip from Grand Junction to Denver so I will repeat it here! I was absolutely appalled that I had to pay for a regular seat that I choose 24 hrs before boarding! Also I checked my large bag which I had to pay for as well, and by the time I boarded all the room in the bins were gone so also had to check that one. I noticed people pulling out oversized suitcases, bigger than the measurements stated for carry on, and also large pack packs stuffed full! So these people were taking up 2 or 3 spaces that the rest of us should have been able to use but couldn’t! NoTV on the flight! Thankfully I had downloaded the United Airlines app and was able to watch movies on my phone. Don’t remember the last time I flew in a plane with no movie screens!

The crew was friendly, the seats are too small. Air travel is barely tolerable anymore.

Food was icecold or frozen including breakfast. Hopeless service. Rude crew.

The flight was very uncomfortable and there was no snacks served for the 13 hours international flight. In addition, the flight was delayed 3 hours

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

Book cheap flights from Seattle to Ontario

Recent round-trip flight deals

6/4Tue
1 stop
18h 00mSEA-YYZ
6/11Tue
1 stop
15h 12mYYZ-SEA
$218
6/1Sat
1 stop
12h 46mSEA-YYZ
6/8Sat
1 stop
15h 12mYYZ-SEA
$248
6/4Tue
1 stop
18h 00mSEA-YYZ
6/11Tue
1 stop
15h 12mYYZ-SEA
$259
6/17Mon
nonstopAir Canada
4h 38mSEA-YYZ
6/18Tue
1 stopAir Canada
7h 44mYYZ-SEA
$375
6/4Tue
nonstopAir Canada
4h 38mSEA-YYZ
6/11Tue
nonstopAir Canada
5h 18mYYZ-SEA
$393
10/4Fri
1 stopUnited Airlines
8h 14mSEA-YYZ
10/8Tue
2 stopsUnited Airlines
9h 51mYYZ-SEA
$428
5/28Tue
1 stopDelta
7h 59mSEA-YYZ
6/13Thu
1 stopDelta
9h 07mYYZ-SEA
$472
6/5Wed
2 stopsDelta
10h 42mSEA-YYZ
6/12Wed
1 stopDelta
11h 23mYYZ-SEA
$498
8/5Mon
1 stopUnited Airlines
13h 34mSEA-YOW
8/12Mon
1 stopUnited Airlines
18h 52mYOW-SEA
$726
8/12Mon
1 stopLufthansa
13h 34mSEA-YOW
9/15Sun
1 stopLufthansa
13h 29mYOW-SEA
$919

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Recent one-way flight deals

6/11Tue
1 stop
17h 46mSEA-YYZ
$78
6/11Tue
1 stop
17h 46mSEA-YYZ
$86
7/15Mon
nonstopAir Canada
4h 40mSEA-YYZ
$173
7/12Fri
1 stopAir Canada
7h 23mSEA-YYZ
$178
10/4Fri
1 stopUnited Airlines
6h 59mSEA-YYZ
$182
10/30Wed
2 stopsUnited Airlines
11h 18mSEA-YYZ
$183
6/5Wed
1 stopDelta
7h 59mSEA-YYZ
$209
7/21Sun
1 stopDelta
7h 37mSEA-YYZ
$237
5/29Wed
1 stopAmerican Airlines
12h 14mSEA-YYZ
$239
6/6Thu
2 stopsAmerican Airlines
9h 10mSEA-YYZ
$244

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Last minute flights from Seattle to Ontario

Last minute flight, train and bus deals

5/10Fri
multi-stopWestJet
20h 59mSEA-YOW
5/12Sun
multi-stopWestJet
9h 56mYOW-SEA
$513
5/9Thu
multi-stopAir Canada
8h 16mSEA-YOW
5/12Sun
multi-stopAir Canada
8h 13mYOW-SEA
$566
5/10Fri
multi-stopWestJet
19h 50mSEA-YYZ
5/13Mon
multi-stopWestJet
8h 01mYYZ-SEA
$604
5/9Thu
multi-stopUnited Airlines
13h 32mSEA-YOW
5/12Sun
multi-stopUnited Airlines
16h 15mYOW-SEA
$667
5/9Thu
multi-stop
10h 09mSEA-YYZ
5/17Fri
multi-stop
15h 15mYYZ-SEA
$667
5/9Thu
multi-stop
13h 43mSEA-YYZ
5/17Fri
multi-stop
19h 26mYYZ-SEA
$696
5/9Thu
multi-stopUnited Airlines
7h 49mSEA-YOW
5/12Sun
multi-stopUnited Airlines
9h 51mYOW-SEA
$714
5/8Wed
multi-stopDelta
10h 42mSEA-YYZ
5/14Tue
multi-stopDelta
8h 00mYYZ-SEA
$834
5/7Tue
multi-stopAmerican Airlines
8h 27mSEA-YYZ
5/14Tue
multi-stopAmerican Airlines
9h 11mYYZ-SEA
$860
5/8Wed
multi-stopAmerican Airlines
8h 27mSEA-YYZ
5/17Fri
multi-stopAmerican Airlines
10h 55mYYZ-SEA
$862

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Seattle - Ontario Flights

Departure:

Seattle (SEA)United States

Return flight deals:

Ontario - Seattle

Cabin classes:

$2,069
$1,364
$248