SEA - YTO

C$ 138 Find Cheap Flights from Seattle to Toronto

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 Toronto departing on 3/8. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Toronto

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Toronto, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Toronto, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Seattle to Toronto (SEA-YTO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Toronto 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 Seattle to Toronto

Thu, 4 Sep - Sun, 7 Sep
WestJet Logo
7:05 a.m. - 6:55 p.m.SEA-YKF
8h 50m1 stop
WestJet Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
C$ 300WestJet
Find Deal
Tue, 16 Sep - Wed, 24 Sep
WestJet Logo
7:05 a.m. - 5:22 p.m.SEA-YYZ
7h 17m1 stop
WestJet Logo
12:00 p.m. - 8:29 p.m.YYZ-SEA
11h 29m2 stops
C$ 307WestJet
Find Deal
Wed, 13 Aug - Wed, 20 Aug
WestJet Logo
1:50 p.m. - 12:46 a.m.SEA-YKF
7h 56m1 stop
WestJet Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
C$ 309WestJet
Find Deal
Mon, 4 Aug - Wed, 13 Aug
WestJet Logo
7:35 p.m. - 6:52 a.m.SEA-YYZ
8h 17m1 stop
WestJet Logo
9:00 a.m. - 6:38 p.m.YYZ-SEA
12h 38m2 stops
C$ 310WestJet
Find Deal
Wed, 17 Sep - Sun, 21 Sep
 Logo
7:16 a.m. - 3:00 p.m.SEA-YYZ
4h 44mdirect
 Logo
8:00 a.m. - 12:59 p.m.YYZ-SEA
7h 59m1 stop
C$ 347
Find Deal
Wed, 8 Oct - Mon, 13 Oct
United Airlines Logo
12:00 p.m. - 7:44 p.m.SEA-YYZ
4h 44mdirect
United Airlines Logo
8:40 a.m. - 10:59 a.m.YYZ-SEA
5h 19mdirect
C$ 370United Airlines
Find Deal
Fri, 19 Sep - Wed, 24 Sep
Air Canada Logo
7:15 a.m. - 7:49 p.m.SEA-YTZ
9h 34m1 stop
Air Canada Logo
12:25 p.m. - 7:31 p.m.YTZ-SEA
10h 06m1 stop
C$ 375Air Canada
Find Deal
Thu, 4 Sep - Sun, 7 Sep
Air Canada Logo
2:55 p.m. - 1:06 a.m.SEA-YYZ
7h 11m1 stop
Air Canada Logo
8:40 a.m. - 10:59 a.m.YYZ-SEA
5h 19mdirect
C$ 377Air Canada
Find Deal
Fri, 8 Aug - Tue, 12 Aug
 Logo
7:17 a.m. - 3:00 p.m.SEA-YYZ
4h 43mdirect
 Logo
6:30 a.m. - 12:58 p.m.YYZ-SEA
9h 28m1 stop
C$ 388
Find Deal
Wed, 8 Oct - Sat, 11 Oct
United Airlines Logo
12:00 p.m. - 7:44 p.m.SEA-YYZ
4h 44mdirect
United Airlines Logo
10:15 a.m. - 3:32 p.m.YYZ-SEA
8h 17m1 stop
C$ 390United Airlines
Find Deal
Expert advice

Expert advice for your flight from Seattle to Toronto

 
Snippets provided in this section are AI-generated based on a summarisation of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Alaska Airlines

Alaska Airlines offers a 20-minute baggage guarantee for quick baggage claim.


Alaska Airlines' Premium Class offers priority boarding and complimentary drinks on flights over 350 miles.

Air Canada

Air Canada's Business Class offers spacious recliners with plenty of legroom on narrowbody aircraft.


Air Canada offers live TV on some North American flights, enhancing in-flight entertainment.

Read more about Air Canadaby Stefanie Waldek
Airports
SEA

Use the SEA Spot Saver for expedited security screening, available daily from 4 a.m. to 10 p.m. at Checkpoints 2, 3, and 5.

Read more about SEAby Harriet Baskas
YYZ

Take the Union Pearson Express train for a stress-free 25-minute ride to downtown Toronto, running every 15 minutes.

Read more about YYZby Mark Stachiew
Our travel experts
Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines and SEA

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on Air Canada

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Mark Stachiew

Mark Stachiew

Expert on YYZ

Mark Stachiew

Mark Stachiew

Mark Stachiew has been exploring the world and writing about it for more than 30 years. His travel stories have appeared in numerous newspapers, magazines and online publications in Canada, the United States and beyond.

Read more
Useful Info

KAYAK's insights & trends for Seattle to Toronto flights

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

What is the cheapest Seattle to Toronto flight route?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Seattle to Toronto.

Our data shows that the cheapest route for a return flight from Seattle to Toronto cost C$ 434 and was between Seattle (SEA) and Toronto Pearson Intl Airport (YYZ). On average, the best prices are found if you fly this route. The average price for a return flight for this route is C$ 434.

What’s the cheapest day of the week to fly from Seattle to Toronto?

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

For Seattle to Toronto, Thursday is the cheapest day to fly on average and Tuesday is the most expensive. Flying from Toronto back to Seattle, the best deals are generally found on Thursday, with Sunday being the most expensive.

What is the cheapest month to fly from Seattle to Toronto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Toronto, 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 Seattle to Toronto is January, where tickets cost C$ 385 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is C$ 715 and C$ 661 respectively.

Can I save money by flying with a layover from Seattle to Toronto?

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$ 569 on average.

How far in advance should I book a flight from Seattle to Toronto?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Toronto, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Toronto, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.


Good to know

Low seasonJanuary
High seasonAugust
Cheapest flightC$ 138
Best time to beat the crowds (32% less expensive on average)
Most popular time to fly (11% more expensive on average)
Flight from Seattle to Toronto Pearson Airport

When to book flights from Seattle to Toronto

Are your dates flexible? Find out the best times to travel from Seattle to Toronto based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Seattle to Toronto

  • What is the cheapest flight from Seattle to Toronto?

    In the last 3 days, the lowest price for a flight from Seattle to Toronto was C$ 101 for a one-way ticket and C$ 220 for a round-trip.

  • Which airports will I be using when flying from Seattle to Toronto?

    Seattle is served by only 1 airport and there are 2 airports in Toronto. You will leave Seattle from Seattle/Tacoma Intl and you will be arriving in Toronto at one of these airports: Toronto Region of Waterloo Intl or Toronto Pearson Intl.

  • Which airlines offer Wi-Fi service onboard planes from Seattle to Toronto?

    Alaska Airlines, Air Canada, United Airlines, and Lufthansa offer inflight Wi-Fi service on the Seattle to Toronto flight route.

  • Which aircraft models fly most regularly from Seattle to Toronto?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Seattle to Toronto flight route.

  • Which airline alliances offer flights from Seattle to Toronto?

    Star Alliance, and oneworld are the airline alliances operating flights between Seattle and Toronto, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from Seattle to Toronto?

    There are direct flights from Seattle to Toronto on a daily basis.

  • Which is the best airline for flights from Seattle to Toronto, Alaska Airlines or United Airlines?

    The two airlines most popular with KAYAK users for flights from Seattle to Toronto are Alaska Airlines and United Airlines. With an average price for the route of C$ 618 and an overall rating of 8.0, Alaska Airlines is the most popular choice. United Airlines is also a great choice for the route, with an average price of C$ 480 and an overall rating of 7.4.

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

    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 Toronto.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Toronto 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 Toronto?

    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 Toronto 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 Toronto?

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

KAYAK’s top tips for finding a cheap flight from Seattle to Toronto

  • Looking for a cheap flight? 25% of our users found flights on this route for C$ 350 or less one-way and C$ 585 or less round-trip.

Prefer to fly direct from Seattle to Toronto?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Seattle/Tacoma Intl to Toronto.
Find which airlines fly direct from Seattle/Tacoma Intl Airport to Toronto, which days they fly and book direct flights.

Direct departures

Seattle/Tacoma Intl to Toronto

Monday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Tuesday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Wednesday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Thursday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Friday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Saturday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Sunday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

See more nonstop flights

Direct returns

Toronto to Seattle/Tacoma Intl

Monday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Tuesday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Wednesday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Thursday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Friday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Saturday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

Sunday

Air Canada,Alaska Airlines

Air Canada,Alaska Airlines

See more nonstop flights

Reviews of the top 4 airlines serving from Seattle to Toronto

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Toronto. 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 Seattle to Toronto? 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.
8.0
Alaska AirlinesOverall score based on 10000 reviews
7.1Food
7.8Comfort
8.1Boarding
8.5Crew
7.1Entertainment
Airline reviews

I was expecting better service from Alaska Airlines. I registered for assistance since I have a disability. The terminal in Seattle, WA was very unprofessional and at times rude. The BWI location was the exact opposite. I will NOT consider Alaska Airlines for future flights.

6.0 GoodAnonymous, Jun 2025SEA - BWI
Read more Alaska Airlines reviews

I was expecting better service from Alaska Airlines. I registered for assistance since I have a disability. The terminal in Seattle, WA was very unprofessional and at times rude. The BWI location was the exact opposite. I will NOT consider Alaska Airlines for future flights.

It was very good and comfortable, Crew was also great

The flight was delayed almost an hour. No wifi on flight.

Good experience, although it was a little cramped being a tall person. Otherwise everything went smoothly and professionally though

Delay of more than 3 hours I didnt recieve neither a voucher for food Attention disaster

Flight was 1:20 later than booked & I never received notice. At airport way too early. Couldn’t hear announcements on PA system. Crew fine. Retrieving luggage fine. Overall experience not good.

I will never take a red-eye flight again. Crying babies. Complete full flight. Could not get comfortable. Not fun.

Flight was OK, landing not good, boarding was ridiculous. Flight was to load at gate n11 25 minutes before boarding time it was changed to s5 which is 3 tram connections on the other side of the airport, I'm handicapped and even getting a sky cap took 10 minutes needless to say just made it to boarding only because it was delayed. I did learn a valuable lesson don't show up for flight 2 hours early.

Only issue was the 2 hr delay after an 8 hr layover. Very long day.

Same crew flew with us from Palm Springs to Bellingham, so they were great! Friendly and kind from start to finish. Great experience!

Flight was actually on Air Canada. The flight itself was fine. Nothing special. Food was pretty pathetic except for cookies. They offered plenty of food and drinks but just wasn't very good. Even for airline food.

Boarding experience was smooth. Flight attendants were friendly and helpful. Entertainment system on the Houston-Edmonton flight did not function for passengers on the left side of the aisle. On the bird's eye flight from Quito to Houston, they should not serve a meal. No one needs to eat after midnight and it is disturbing for those passengers trying to sleep.

Flight was late as pilot crew had to land at different airport in their previous flight. Passengers boarded and had to wait for pilots inside plane. Series of incomplete and unnecessary announcements by an annoying voice, rather than complete, informative announcements.

Delay and keep changing gates. I have to run around from B to C then to E.

Boarding was a little difficult. The gate area at O'Hare was very small and crowded due to multiple gates in the area. Could not hear the intercom, so had to rely on signage to see when my group was boarding and the signage was blocked by passengers standing in the gate. Flight was great and we arrived in Montreal on time.

My suitcase was completed destroyed. The top part is broken and unusable now.

When I booked it on Kayak it aaid that I wasn't allowed hamd luggage. I called United Airlines and it took them 6 minutes to figure out if I was allowed free hand luggage. Surely something that simple they should be able to tell me instantly.

I do prefer to fly United and have always had excellent service, except for bad weather. Flights are on time and staff is alway curtious and helpful

We were delayed in Toronto on the tarmac for THREE hours with no clear indication as to why except that it was not a safety hazard. Pilot did apologize more than once but even he was unable to explain why exactly we were delayed. I overheard the stewards saying that the captain was very frustrated with the situation as well because he was not able to explain why except it had something to do with water supply or system on the aircraft and now we needed to wait for an engineer to approve the aircraft for flight. It was very frustrating and distressing as a passenger and we should have been given complimentary meals at the very least.

All male crew was just too woke for me. I felt like a sardine. I will never take a window seat or the rearmost seat again. I booked early and did not pay for seat selection and that was a mistake. The security at IAH was atrocious. I was violated and radiated as I was in a hurry to connect to my other flight. I may have lost items under the seat in front of me that I couldn't see nor bend over to look.

The flight attendants were super! They created a cosy and warm flight atmosphere!

West Jet flight was cancelled and I was not notified. I found out when I tried to check in on-line. Spent 4 hours on the phone with West Jet and Just Fly trying to figure what happened.

It was good, flight was on time, boarding was smooth and done in zones, food was good too but there was no form of entertainment. Luggage’s were intact. So an overall good flight

Flight was delayed 3 times. Then cancelled due to pilot being timed out. They refused hotel vouchers. Gate attendants were very rude and could not help you at all.

No access to any entertainment No food other than a cookie or pretzels even tho flight was over the supper hour Seats very close together and very little leg room Staff was very good

The cancelation of my flight from Toronto to Edmonton without any solution given to me for my next flight. Very poor connection from Toronto to Edmonton

Too squished in seats. I'm 110 lbs and 5'6....can't imagine being any bigger and flying

Scrooge airlines spoiled my last chance at Christmas with my 95 and 92 year old folks. and rest of the family in Calgary. Ticket personnel would not let me on without a passport and I always visit Canada with my enhanced driver;s License when I travel from the US

Original flight canceled and communicated poorly. A series of gate changes , delays and plane changes followed. Even after the entire flight boarded there was another plane changes followed. Food vouchers provided to my travel companion but not to me despite being on the same reservation. No in flight entertainment. The entire experience was terrible although the flight crew were great.

Flight was on time. Online check in capabilities made things quick and easy. Zone boarding was enforced, which I appreciate. Everyone was not lining up ahead of their zone being called. Crew was professional and friendly.

Abandoned me in hallway in a wheelchair… which I asked for because I sprained my back. After waiting in the hallway, I decided to walk the rest of the way since someone respecting me up.. My experience with the united was totally the opposite. Wheelchair access, propped swift and save me a lot of grief. Air Canada totally disorganized.

Bad experience boarding and flight got delayed didn’t make it to my next flight

The food on the trip Toronto to Athens could be better: the chicken didn’t taste good.

Conflicting information provided about baggage allowance. One screen said I had a carry on and another said I didnt.

Flight was delayed but the real issue is how long we sat after boarding. Space very limited for an overnight flight and seatbacks didn’t recline so it was almost impossible to sleep.

The staff made sure I was comfortable, moved me to a better seat with more leg room

Somehow, my booking was under my preferred name instead of my legal name so they almost didn’t let me board the plane at LAX. This problem should have been notified to me when I was still in Toronto.

When arriving over 2 hours early to check k in at Charlotte airport I was told I would have to check my carry on ? Apparently the flight was full and may not be room. I was not given a choice and the agent was quite unpleasant about it. I am a senior amd was not comfortable me having to worry about my bag being lost vut it didn’t seem to bother him. There were lots and lots of people of all ages in line when we boarded with carryons and most larger than mine .the rest of my journey was pleasant vut this was totally unacceptable.

The layover was 6 PLUS hours and we were only given a $15.00 voucher. We missed our first activity in Quebec due to the delay.

Miserable staff as it was a late/delayed flight and crew wasn’t in the best spirits. Completely understood as neither was most of the passengers. Still unacceptable l.

Everything you need to know for your flight from Seattle to Toronto

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