SEA - YTO

C$ 231 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 6/9. 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

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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Everything you should know

Cheapest round-trip
C$ 478
Typical prices: C$ 420-C$ 714
WestJet
Thu 22/10Tue 27/10
SEA - YYZ • 1 stop
Cheapest direct flights
C$ 627
Typical prices: C$ 447-C$ 789
Alaska Airlines
Mon 12/10Tue 20/10
SEA - YYZ • Direct
Advice from real travellers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Alaska Premium Class adds priority boarding; baggage guarantee speeds claim.
Air Canada offers live TV on some flights; use SEA Spot Saver for faster security.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from C$ 478 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Direct flights
You can fly direct with Air Canada and Alaska Airlines. Average duration is 4h 42m
Direct flights
Direct flights
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Direct flights
Direct flights
+1
Top routes
Cheapest
Most popular
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg C$ 462 (round-trip)
Shortest trip • 7h 41m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 51% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 29% price drop
Most popular
Good to know
Good to know
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Flight Deals
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Flight 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, 22 Oct - Tue, 27 Oct
WestJet Logo
7:35 p.m. - 5:45 a.m.
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
7:45 a.m. - 2:20 p.m.
YYZ
-
SEA
9h 35m
1 stop
C$ 478WestJet
Mon, 28 Sep - Thu, 1 Oct
WestJet Logo
7:35 p.m. - 5:45 a.m.
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
1:30 p.m. - 6:45 p.m.
YYZ
-
SEA
8h 15m
1 stop
C$ 482WestJet
Mon, 28 Sep - Fri, 2 Oct
WestJet Logo
7:35 p.m. - 5:45 a.m.
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
1:30 p.m. - 6:45 p.m.
YYZ
-
SEA
8h 15m
1 stop
C$ 484WestJet
Tue, 8 Sep - Tue, 15 Sep
WestJet Logo
7:35 p.m. - 5:45 a.m.
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
1:30 p.m. - 6:45 p.m.
YYZ
-
SEA
8h 15m
1 stop
C$ 488WestJet
Sun, 18 Oct - Tue, 3 Nov
WestJet Logo
7:35 p.m. - 5:45 a.m.
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
7:45 a.m. - 1:20 p.m.
YYZ
-
SEA
8h 35m
1 stop
C$ 489WestJet
Sun, 18 Oct - Wed, 4 Nov
WestJet Logo
7:35 p.m. - 5:45 a.m.
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
7:45 a.m. - 1:20 p.m.
YYZ
-
SEA
8h 35m
1 stop
C$ 491WestJet
Tue, 4 Aug - Tue, 11 Aug
Air Canada Logo
5:50 a.m. - 1:15 p.m.
SEA
-
YTZ
28h 25m
2 stops
Air Canada Logo
12:30 p.m. - 10:42 p.m.
YTZ
-
SEA
13h 12m
2 stops
C$ 640Air Canada
Fri, 2 Oct - Fri, 9 Oct
Multiple Airlines Logo
10:30 a.m. - 10:09 p.m.
SEA
-
YHM
8h 39m
2 stops
Multiple Airlines Logo
6:10 p.m. - 9:40 a.m.
YHM
-
SEA
18h 30m
1 stop
C$ 665Multiple Airlines
Wed, 5 Aug - Wed, 12 Aug
Air Canada Logo
10:45 a.m. - 1:15 p.m.
SEA
-
YTZ
23h 30m
2 stops
Air Canada Logo
8:30 a.m. - 10:07 a.m.
YTZ
-
SEA
28h 37m
2 stops
C$ 704Air Canada
Sat, 24 Oct - Tue, 27 Oct
Air Canada Logo
5:40 a.m. - 1:23 p.m.
SEA
-
YTZ
28h 43m
2 stops
Air Canada Logo
6:45 a.m. - 2:37 p.m.
YTZ
-
SEA
10h 52m
2 stops
C$ 731Air Canada
Booking Insights

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.

How much is a round-trip flight from Seattle to Toronto?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Seattle to Toronto departing in October.

What is the cheapest Seattle to Toronto flight route?

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

The cheapest return flight from Seattle to Toronto costs C$ 447 on the route between Seattle (SEA) and Toronto Pearson Intl Airport (YYZ). It is also the most popular route.

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 Monday is the most expensive. Flying from Toronto back to Seattle, the best deals are generally found on Thursday, with Monday 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 November, where tickets cost C$ 125 (return) on average. On the other hand, the most expensive months are August and May, where the average cost of round-trip tickets is C$ 234 and C$ 226 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$ 484 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 3 weeks before departure, which saves you about 51% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Expert advice

Expert advice for your flight from Seattle to Toronto

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Air Canada

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.

Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines and SEA

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.

Mark Stachiew

Mark Stachiew

Expert on YYZ

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.

Good to know

Low seasonFebruary
Cheapest flightC$ 231
Best time to beat the crowds (22% less expensive on average)
Most popular time to fly (25% 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 5 days, the lowest price for a flight from Seattle to Toronto was C$ 233 for a one-way ticket and C$ 478 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?

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

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

    The Airbus A220-300 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 WestJet?

    The two airlines most popular with KAYAK users for flights from Seattle to Toronto are Alaska Airlines and WestJet. With an average price for the route of C$ 637 and an overall rating of 7.9, Alaska Airlines is the most popular choice. WestJet is also a great choice for the route, with an average price of C$ 394 and an overall rating of 7.2.

  • 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$ 448 or less one-way and C$ 765 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 airlines flying 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.
7.9
Alaska AirlinesOverall score based on 12573 reviews
8.1Boarding
7.0Entertainment
8.5Crew
7.0Food
7.8Comfort
Airline reviews

Someone rebooked my Alaska flight to a much later Delta flight. Now I am sitting at the Seattle airport after a long international flight and have to wait another 4 hours even though I would have been able to catch my initial flight

2.0 MediocreAnonymous, Jun 2026
SEA - EUG
Read more Alaska Airlines reviews

Someone rebooked my Alaska flight to a much later Delta flight. Now I am sitting at the Seattle airport after a long international flight and have to wait another 4 hours even though I would have been able to catch my initial flight

I was very surprised that at the Seattle airport, Alaska's main hub, that the gates were very small and very close together, and it was very hard to discourage between my flight, and the flight next to us going to Boise and the flight next to that going to Denver. Denver. The audio for all three Gates was at the same level, and almost impossible to differentiate unless they actually said their flight number and location. Location. People tried to get on our plane, before they were ready, because they were confused about the Denver announcements. We were on a Boeing 737- 800 00, that must have recently been redone. It actually had USB--c ports which really surprised me. The Apu was out on the plane, so when we got on it was very very hot. A lot of people were complaining. The gate agents were very professional, but it was a lot going on and even though there were two of them, I think they could have used another person to help them. Mandy was particularly helpful in getting me a window seat. Flight crew was up to the usual Alaska airline standard, which is very high. Can we please get another snack then garlic pretzels? It would also be nice, if they knew ahead that the flight was full, to offer to let us check in our bags for free at baggage check, and not at the gate!

On time, good seats, not overly full, up beast positive crew.

Airport security lines in Seattle were awful. The only staff that was pleasant and made the trip more enjoyable was the young woman at the gate in Seattle. She was so pleasant and helpful. Flight attendant on the plane seemed like she would rather be anywhere but on that plane.

People were friendly. Flight was a little delayed. Maybe I missed the reason for it. Overall a nice experience.

Crews were friendly enough. To help the airline I checked my carry on baggage. Typical "gonna be a full flight we need 19 carry on bags to be checked to help out". So I helped out only to have to wait 30+ mins for my luggage and risked not getting to my car rental on time. The return flight was delayed. Kept hearing employees say something about "they didn't have any power" which is kind of concerning. The air flow and air conditioning was insufficient. It was warm and stuffy during the flight. Plus no free wi-fi......Booooooo!

Didn’t even get on, check my flight to Seattle for details. Do better Alaska.

A five hour nonstop flight traveling over a few time zones and over the dinner hour and you get a small bag of pretzels. And no screens to watch movies. I

The flight kept getting delayed due to a maintenance issue. That happens, but there is no excuse for changing the gate FIVE TIMES, including one time nearly all the way across SeaTac. After we were delayed for 3+ hours, they did send us (via email) a $12 meal voucher...except you can't find a $12 meal anywhere in that airport, unless you consider a bag of M&M's and a bottle of water a meal. The plane had one problem after another but finally took off 4.5 hours late. This caused us to miss our hotel shuttle at ORD (they didn't run past midnight and it was 3 am) so we had to wait 25 minutes and pay for an Uber. I did get a $50 flight voucher from Alaska...big deal. Barely covers my Uber ride that I shouldn't have needed.

I upgraded to a better seat and it was much more comfortable. Nobody serves food anymore and actually on a 2+ hr flight not necessary. I didn’t even get water.

Westjet never disappoint always terrible small plane ,crowded cheap snack if you can call it snack

Westjet was late and we missed our connecting flight with Cathay. Had to wait 8 hours. Westjet only allows 1 checked in baggage for international flights- it’s always been 2. Canada allows only 1 sandwhich bag size full off small liquids. Everything else will be tossed. Awful trip. Will never fly west jet or go to Toronto to connect flights!

I thought the coffee was excellent! The wait for the luggage was acceptable.. It left and arrived on time. My son found that his device worked very well and he really enjoyed his flight! The stewardess moved him up to the emergency exit and he very much appreciated that!

I wasn’t able to book or pay for a seat and they forgot to check me in for my third flight so I spent 24 hours in Toronto waiting for another one.

I didn't think about not having the right app for wifi because my connecting flight was with Westjet and when I took off from Seattle I was thinking I would use my wifi, but realized I couldn't on my Westjet app and I did not have Delta's app downloaded.

Everything was good except for flight delay, but it was because of the snow storm in the arrival airport.

The flight was cancelled less than 24 hours before departure. The alternate flight was a day later going from Grenada to Toronto to Vancouver to Calgary to Montreal. 2 days in the air. Not serious, Very bad service

I like the wider seats, Plus lots of legroom, Lacking entertainment, no tv or screen to play with

Liked in-flight wifi Did not like - nothing to complain, really. All good

The keg from Edmonton to Toronto My wife found it very cold. Other than that great flight.

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

Information on your arrival and departure airports