SEA - YTO

C$ 108 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 8/4. 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$ 332
WestJet
Thu 30/4Sun 24/5
SEA - YHM • 1 stop
Cheapest direct flights
C$ 356
Typical prices: C$ 332-C$ 518
Air Canada
Thu 5/3Mon 9/3
SEA - YYZ • Direct
Our travellers' advice
AI-generated summary based on content written by travel experts
Use SEA Spot Saver for faster security at Seattle.
Alaska's Premium Class offers priority boarding perks.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
WestJet
Cheapest • from C$ 332 (round-trip)
Alaska Airlines
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Top routes
SEA-YYZ
Cheapest
SEA-YYZ
Most popular
Insights
Insights
Insights
Insights
When to book
4 weeks
in advance
Our data shows that travellers who book at least 4 weeks in advance save around 59% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 28% price drop
August
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Toronto!
Flight Deals
Booking Insights
Expert advice
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, 30 Apr - Sun, 24 May
WestJet Logo
2:05 p.m. - 12:40 a.m.SEA-YHM
7h 35m1 stop
WestJet Logo
6:00 a.m. - 1:08 p.m.YHM-SEA
10h 08m1 stop
C$ 332WestJet
Find Deal
Thu, 8 Jan - Wed, 14 Jan
WestJet Logo
3:10 p.m. - 1:22 p.m.SEA-YHM
19h 12m1 stop
WestJet Logo
6:10 p.m. - 2:20 p.m.YHM-SEA
23h 10m1 stop
C$ 347WestJet
Find Deal
Fri, 6 Mar - Mon, 9 Mar
WestJet Logo
3:10 p.m. - 5:58 a.m.SEA-YYZ
11h 48m2 stops
WestJet Logo
12:30 p.m. - 2:19 p.m.YYZ-SEA
28h 49m2 stops
C$ 353WestJet
Find Deal
Tue, 13 Jan - Tue, 13 Jan
Air Canada Logo
8:10 a.m. - 3:53 p.m.SEA-YYZ
4h 43mdirect
Air Canada Logo
6:35 p.m. - 9:31 a.m.YYZ-SEA
17h 56m2 stops
C$ 354Air Canada
Find Deal
Fri, 9 Jan - Mon, 12 Jan
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
WestJet Logo
6:20 a.m. - 2:20 p.m.YKF-SEA
11h 00m1 stop
C$ 354WestJet
Find Deal
Fri, 9 Jan - Sun, 11 Jan
WestJet Logo
3:10 p.m. - 5:58 a.m.SEA-YYZ
11h 48m2 stops
WestJet Logo
6:30 p.m. - 2:20 p.m.YYZ-SEA
22h 50m2 stops
C$ 356WestJet
Find Deal
Fri, 12 Dec - Mon, 15 Dec
United Airlines Logo
1:40 p.m. - 9:58 a.m.SEA-YYZ
17h 18m1 stop
United Airlines Logo
5:55 p.m. - 12:50 a.m.YYZ-SEA
9h 55m1 stop
C$ 357United Airlines
Find Deal
Thu, 8 Jan - Wed, 14 Jan
Air Canada Logo
10:05 a.m. - 9:37 p.m.SEA-YYZ
8h 32m1 stop
Air Canada Logo
8:15 a.m. - 2:31 p.m.YYZ-SEA
9h 16m2 stops
C$ 359Air Canada
Find Deal
Thu, 30 Apr - Sun, 24 May
Multiple Airlines Logo
2:05 p.m. - 12:45 a.m.SEA-YKF
7h 40m1 stop
Multiple Airlines Logo
6:10 a.m. - 8:28 p.m.YKF-SEA
17h 18m2 stops
C$ 415Multiple Airlines
Find Deal
Sun, 11 Jan - Sun, 18 Jan
Multiple Airlines Logo
11:55 a.m. - 7:00 p.m.SEA-YHM
28h 05m2 stops
Multiple Airlines Logo
8:15 a.m. - 6:49 p.m.YHM-SEA
13h 34m1 stop
C$ 417Multiple Airlines
Find Deal
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.

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$ 140 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, Wednesday is the cheapest day to fly on average and Saturday 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 January, where tickets cost C$ 398 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is C$ 696 and C$ 635 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$ 352 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, which saves you about 59% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

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.

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.

YYZ

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

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

Good to know

Low seasonJanuary
Cheapest flightC$ 108
Best time to beat the crowds (28% less expensive on average)
Most popular time to fly (15% 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$ 108 for a one-way ticket and C$ 332 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?

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

  • 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$ 641 and an overall rating of 8.0, Alaska Airlines is the most popular choice. WestJet is also a great choice for the route, with an average price of C$ 384 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$ 155 or less one-way and C$ 411 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 3 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.
8.0
Alaska AirlinesOverall score based on 11375 reviews
7.0Entertainment
8.5Crew
7.8Comfort
7.1Food
8.1Boarding
Airline reviews

We flew economy, it was what I expected. The seats are too upright for me

10.0 ExcellentAnonymous, Nov 2025SEA - SMF
Read more Alaska Airlines reviews

We flew economy, it was what I expected. The seats are too upright for me

I purchased a 1st class ticket and unfortunately the main flight attendant was not the best and seemed more interested in her phone than the passengers at times. Then the plane didn’t get restocked and the only snacks for this flight were pretzels. However I would like to say that the rest of the flight crew and ground crew at the airport we’re great, especially the people that wheeled me around the airport some and then the one getting me to the plane and the automated wheelchair that wheeled me through the airport.

Typical domestic flight. No entertainment. You have to use your own devices and provided entertainment didn’t work. Pretzels and water of flight over 4 hours is unacceptable. Meals should be provided on long flights. But it’s about the money and not customer service. You should just issue the bag of pretzels at the gate and water bottle in seat and just do away with flight attendants because they do nothing on domestic flights

Very good. Easy check in, attentive flight attendant, and on time departure/landing.

Again Alaskan and Hawaiian need to consolidate check-in, allow seat reservations on both flights. I wound up in last row because I couldn’t reserve better seat.

I would like if it had happened already. I'm still waiting for it.

Pretzels are always a disappointment. Cheezits, Sun Chips, trail mix, anything else would be nice.

Its bumpy but I can say its safe flight ,Thanks Alaska airline for bringing me in my destination😊.

Almost 3 hr delay in Settle with very little information available to passengers. They boarded the plane and we waited for a long time inside the plane as well.

This was our first time flying with Alaska. It was a seamless experience, with comfortable seats and leg room. Staff were friendly and helpful.

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.

Smooth flight Staff were courteous and welcoming upon entering and exiting the plane Pilot and crew provided frequent updates Leg space was not pleasant but manageable

Everything was good except I was a bit disappointed that I had to pay US $150 for bags.

Flight itself good .Landing at terminal3 and connections to terminal1,it is connections nightmare,specially for disable person

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.

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

It was just fine. I managed to make all my connection too sbut had trouble in Munich with no wheel chair and trouble trying to get help from the airport people to get to the other terminal for my flight. Finally a wonderful lady Amelia, helped me to make my flight connection Timon with zero time to spare.

Super experience. Earlier than schedule departure and arrival. Baggage handling was very good

I would like to get my money back. I flight was 4 hours late on the way to detroit, And same on my way back to Brussels they cancelled my flight and give me an other ticket and i had to wait 5 hours.

All attendents were very efficient, pleasant and happy. Everything went smoothly. The seats could have been wider. There could have been more free food instead of just one small bar.

My seat was one of those that couldn't recline, but the problem was that it was abnormally upright, so the headrest actually made the seat concave, which was uncomfortable and hard on my lower back. I had to ball my jacket up and use it as lumbar support. goodness I had it with me.

I liked a lot , the flight attendant so nice ,the seat very comfortable I enjoyed the flight , I will do it again with Air Canada,

Elderly female flight attendant was not customer friendly. There were only about 12 people on a regional jet that had about 60 seats. There were 8 exit row seats and none of them were taken. We attempted to sit in those seats and the flight attendant gave the standard " you didn't pay for those" so she would not allow us to move. What harm would that have caused ? They assigned seats to 5 of the 12 people in 2 rows, row 20 and 21. A simple friendly customer experience gesture of allowing us to sit in exit rows would have gone a long way in me having a very favorable impression on Air Canada. After that I have very poor impression of Air Canada and will not fly with them when I can avoid it.

Pearson Airport could not properly handle all the passengers who they needed to process in order to properly get them on board. As a result, I missed the departure of my flight from Toronto. The only saving grace is that Air Canada found a flight that only delayed me by one hour. However, this was no thanks to Pearson Airport!

Almost everything it was a “cool” ambiance but we arrived to Toronto so that it’s ok for me

The crew was really nice. The plane seats were kinda small even for a 5’6” / 158 lbs person.

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

Information on your arrival and departure airports