YYZ - SEA

$140 Find Cheap Flights from Toronto to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Toronto to Seattle departing on 5/13. 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

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Toronto to Seattle.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Toronto to Seattle.
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Cheap Flight Deals from Toronto to Seattle (YYZ-SEA)

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

Recent round-trip flight deals from Toronto to Seattle

KAYAK's recommended round-trip deals from the most popular airlines that fly from Toronto to Seattle.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
WestJet Logo
1:30 pm - 7:10 pmYYZ-SEA
8h 40m1 stop
WestJet Logo
8:25 am - 12:35 amSEA-YYZ
13h 10m2 stops
$233WestJet
Find Deal
Wed, May 21 - Wed, May 28
Air Canada Logo
8:25 am - 10:45 amYYZ-SEA
5h 20mnonstop
Air Canada Logo
1:45 pm - 1:09 amSEA-YYZ
8h 24m1 stop
$236Air Canada
Find Deal
Tue, May 27 - Tue, Jun 3
Air Canada Logo
9:05 am - 2:13 pmYYZ-SEA
8h 08m1 stop
Air Canada Logo
7:20 am - 7:48 pmSEA-YYZ
9h 28m1 stop
$242Air Canada
Find Deal
Tue, Jun 10 - Sat, Jun 14
WestJet Logo
8:00 am - 12:58 pmYYZ-SEA
7h 58m1 stop
WestJet Logo
7:05 am - 6:56 pmSEA-YYZ
8h 51m1 stop
$244WestJet
Find Deal
Wed, May 21 - Tue, May 27
Alaska Airlines Logo
4:45 pm - 7:04 pmYYZ-SEA
5h 19mnonstop
Alaska Airlines Logo
7:23 am - 3:00 pmSEA-YYZ
4h 37mnonstop
$269Alaska Airlines
Find Deal
Thu, May 29 - Mon, Jun 2
Alaska Airlines Logo
4:45 pm - 7:04 pmYYZ-SEA
5h 19mnonstop
Alaska Airlines Logo
7:23 am - 3:00 pmSEA-YYZ
4h 37mnonstop
$281Alaska Airlines
Find Deal
Wed, May 21 - Wed, May 28
Delta Logo
3:59 pm - 8:30 pmYYZ-SEA
7h 31m1 stop
Delta Logo
12:40 am - 11:29 amSEA-YYZ
7h 49m1 stop
$282Delta
Find Deal
Wed, Sep 17 - Tue, Sep 23
United Airlines Logo
8:25 am - 10:45 amYYZ-SEA
5h 20mnonstop
United Airlines Logo
11:50 pm - 2:38 pmSEA-YYZ
11h 48m1 stop
$291United Airlines
Find Deal
Sun, May 25 - Thu, May 29
United Airlines Logo
7:00 pm - 12:59 amYYZ-SEA
8h 59m1 stop
United Airlines Logo
11:45 pm - 6:35 pmSEA-YYZ
15h 50m1 stop
$334United Airlines
Find Deal
Mon, Jun 16 - Fri, Jun 27
Delta Logo
6:45 am - 12:31 pmYYZ-SEA
8h 46m1 stop
Delta Logo
1:15 pm - 12:33 amSEA-YYZ
8h 18m1 stop
$336Delta
Find Deal
Fri, Jun 13 - Sun, Jun 22

Expert advice for your flight from Toronto to Seattle

 
Snippets provided in this section are AI-generated based on a summarization 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
Air Canada

Air Canada’s Business Class offers spacious recliners with ample legroom, ideal for comfort on medium-haul flights.


Access Maple Leaf Lounges with Business Class or Aeroplan Elite Status for a relaxing pre-flight experience.

Read more about Air Canadaby Stefanie Waldek
Alaska Airlines

Enjoy priority boarding and extra legroom in Premium Class, with complimentary drinks on flights over 350 miles.


Benefit from Alaska’s 20-minute baggage guarantee or receive a discount code or bonus miles if delayed.

Airports
YYZ

Pearson's security lines can be long. Arrive early: 2 hours for domestic, 3 for international flights. Check wait times online for better planning.

Read more about YYZby Stefanie Waldek
SEA

Use the Link light rail for a cost-effective 40-minute trip from SEA to downtown Seattle, avoiding rush hour traffic.

Read more about SEAby Harriet Baskas
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Air Canada and YYZ

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
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

KAYAK's insights & trends for Toronto to Seattle flights

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

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

The average price of all round-trip flights from Toronto Pearson Intl Airport to Seattle clicked on KAYAK for each day over the last 12 months.
If your flying dates are flexible, you should consider flying to Seattle on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Toronto to Seattle. For your return ticket, we recommend flying on a Thursday and avoiding Sundays for the best deals.

What is the cheapest month to fly from Toronto Pearson Intl Airport to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Toronto Pearson Intl Airport to Seattle, 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 Toronto Pearson Intl Airport to Seattle is February, where tickets cost $269 (return) on average. On the other hand, the most expensive months are May and December, where the average cost of round-trip tickets is $455 and $450 respectively.

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

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.
No, with an average price for the route of $782, prices are generally cheapest when you fly direct.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Toronto Pearson Intl Airport to Seattle, 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 Toronto Pearson Intl Airport to Seattle, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Good to know

Low season

March

High season

August

Cheapest flight

$140
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly with an average 10% increase in price.
Flight from Toronto to Seattle

When to book flights from Toronto to Seattle

Are your dates flexible? Find out the best times to travel from Toronto to Seattle 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 Toronto to Seattle flights

  • What is the cheapest flight from Toronto Pearson Intl Airport to Seattle?

    In the last 3 days, the lowest price for a flight from Toronto Pearson Intl Airport to Seattle was $140 for a one-way ticket and $233 for a round-trip.

  • Do I need a passport to fly between Toronto and Seattle?

    Yes, you’ll need a passport to travel to Seattle from Toronto.

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

    All the following airlines offer inflight Wi-Fi service on the Toronto to Seattle flight route: Air Canada, Alaska Airlines, United Airlines, Delta, Jazz, WestJet, and American Airlines.

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

    The Airbus A220-300 is the aircraft model that flies most regularly on the Toronto to Seattle flight route.

  • Which airline alliances offer flights from Toronto to Seattle?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Toronto to Seattle are Alaska Airlines and Delta. With an average price for the route of $414 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $414 and an overall rating of 8.0.

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

    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 Toronto to Seattle.

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

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

    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 Seattle with an airline and back to Toronto with another airline. Booking your flights between Toronto and SEA can sometimes prove cheaper using this method.

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

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

See more FAQs

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

  • Looking for a cheap flight? 25% of our users found flights on this route for $208 or less one-way and $366 or less round-trip.

Prefer to fly direct from Toronto to Seattle?

Find which airlines fly direct from Toronto Pearson Intl Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.

Direct departures

Toronto Pearson Intl to Seattle/Tacoma Intl

Monday

Air Canada, Air Tahiti Nui, Alaska Airlines, +2 more

Air Canada, Air Tahiti Nui, +3 more

Tuesday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Wednesday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Thursday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Friday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Saturday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Sunday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

See more direct flights

Direct returns

Seattle/Tacoma Intl to Toronto Pearson Intl

Monday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Tuesday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Wednesday

Air Canada, Air Tahiti Nui, Alaska Airlines, +4 more

Air Canada, Air Tahiti Nui, +5 more

Thursday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Friday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Saturday

Air Canada, Air Tahiti Nui, Alaska Airlines, +3 more

Air Canada, Air Tahiti Nui, +4 more

Sunday

Air Canada, Air Tahiti Nui, Alaska Airlines, +4 more

Air Canada, Air Tahiti Nui, +5 more

See more direct flights
See more direct flights

Top 5 airlines serving from Toronto to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Toronto to Seattle. 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 Toronto to Seattle? 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 9918 reviews
7.9Comfort
7.1Food
8.2Boarding
7.1Entertainment
8.5Crew
Airline reviews

The flight was delayed due to a safety check. Why couldn't that have been done ahead of time? We got to Seattle with enough time to make our connecting flight but they kept changing the gate so we missed it. There were at least ten of us who missed the flight. The airline was aware. They could have waited. They didn't. Our new flight was not for seven hours and then was delayed another two hours. We got the last seats which don't recline. Super uncomfortable after a long day spent at the worst airport. Did they offer us a meal voucher or anything? On top of that Alaska Airlines didn't complete my ticket to the new flight. I wasn't sure I would get on this horrible flight, either. Oh, and it's ten o'clock at night....no food. Is this how Alaska Airlines treats its customers? I'll never fly with this airline again.

2.0 MediocreDeb, Apr 2025ATL - SEA
Read more Alaska Airlines reviews

The flight was delayed due to a safety check. Why couldn't that have been done ahead of time? We got to Seattle with enough time to make our connecting flight but they kept changing the gate so we missed it. There were at least ten of us who missed the flight. The airline was aware. They could have waited. They didn't. Our new flight was not for seven hours and then was delayed another two hours. We got the last seats which don't recline. Super uncomfortable after a long day spent at the worst airport. Did they offer us a meal voucher or anything? On top of that Alaska Airlines didn't complete my ticket to the new flight. I wasn't sure I would get on this horrible flight, either. Oh, and it's ten o'clock at night....no food. Is this how Alaska Airlines treats its customers? I'll never fly with this airline again.

It was very comfortable. Personal entertainment screens would, of course, have been nice. And the flight in Seattle was delayed, but... things happen. All in all, I like Alaska Airlines very much.

Flying sucks these days. No airline is better than another. Alaska Air At least gives you some pretzel snacks. That is about all I can say for it.

If all the airlines were ran so well. Staff very professional and kind.

Direct and non stop. We were late checking in but had paid for our luggage to be checked and they easily took the bags at the gate for us. We unfortunately had to take our bags through TSA and lost a few items...

The FTA in the JFK airport was so mismanaged. It needs improvement. Flight attendants should set age limits. In-flights snacks should provide two times instead one.

First time flying with any airline that has decent seating. Great experience crew was friendly and the pilot was as well.

Pretty disappointing as we did leave Seattle two hours late.

CREW ON AIRCRAFT WAS GREAT. GREATLY DISAPPOINTED WITH THE ALASKA AIRLINES LOUNGE IN SEATTLE. I PAID FULL FARE FIRST CLASS TICKET FROM YYJ - SEATTLE-CHICAGO-CMH. THEY SAID THE NEXT FLIGHT WASN'T LONG ENOUGH TO ENTER THE LOUNGE. UNBELIEVABLE. WHAT DOES IT COST FOR A CUP OF COFFEE AND A DONUT? I PAID FOR A FIRST CLASS TICKET. DELTA ALSO OFFERS SAME ROUTE, SO JUST BECAUSE OF THE COST OF A DONUT, I'LL BE USING DELTA MOVING FORWARD.

1.5 hour delay boarding plus 1+ hour sitting in plane waiting for ground crew to load luggage and freight, made for 3:00AM arrival in Seattle.

Delta flight was on time, seats were comfortable, and crew was nice.

This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

Delta is a cut above the others in customer service.

The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.

A little bumpy ride . No food was being provided due the the turbulence. That was ok it was a short flight to my standards.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

I love the free WiFi!! Crew was nice. Bathroom was decent. First time flying delta in a long time and I enjoyed it. Will definitely look into booking with Delta more but I think Delta is a little more expensive than the other airlines.

third trip overseas with delta recently where the TV did not work- not acceptable for a 8 hour flight! your food really has declined crew great and I am loyal to delta

Boarding in Amsterdam is always chaotic. KLM/ Delta has not streamlined or made it efficient as it was boarding in Detroit . The food was mediocre The crew was unfriendly and more focused on getting things done quickly rather than service with a smile .

leg space better than expected. two washrooms for one plane isn't enough.

Plane temperature was comfortable (not to hot) when boarding and waiting for takeoff.

Michael, our FA was very attentive, even finding me a chocolate brownie from economy class when the dessert selections were all dairy based. ( intolerant, not allergic so don’t usually need to order dairy free)

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

It was my first time with United Airlines and I would say it was very good experience and best of all the flights were on time. Will definitely fly with United Airlines next time.

headphone jack didnt work for the first flight and not much variety

The seats on this flight were almost roomy enough to be the basic amount needed for human existence. I think my favorite part of this flight was it landed at an A gate, which was the most palatial part of Sea-Tac I've ever seen - a massive improvement from the S gates.

The seats on this flight were almost roomy enough to be the basic amount needed for human existence.

Plane 3 hours late. Missed connection. No help from gate staff. App horrible. Lost connection repeatedly. No service desk. Finally got help from young girl driving cart.

Not as good as expected Air Can needs to improve totally rated on internet as worst

Internet on both flights was sketchy. Thus in flight entertainment was non- existent on MN - Balrimote leg.

We never had an experience they canceled the flight and they did not offer us an alternative flight. I had to book one on my own expense. They offered us food voucher and we could not use them at the airport it kept saying not attached to an existing flight. The people at the counter were rude and cold and they did not care about our situation

It took 30 minutes to check in with the Westjet rep. They didn’t have enough seats and she needed to make a call… I am always “randomly” selected to be checked at security. Their “randomly “ selection system may need some updating. They treat people like criminals. It is not appropriate behavior.

Found the seats very crowded—too close together ! And waited a long time for our luggage All staff at both ends were excellent!!!

Flight cancelled and Kayak switched our return flight to a red eye. Ridiculous.

Will never book through you again. Very disappointed in the notices and action taken or provided when planes are rescheduled, enough to cause missed connections

Lost my luggage. Filed a report and there is no response. Received a phone call from another airline that said they had the bag and they did not know what to do with it

Very good over all , would have been nice to have entertainment on the flight

Absolutely the worst airline I have ever taken. They lost my baggage and told me my bag tags had been cancelled. When my bags arrived days later I had to pick them up at 3:15 am. My return flight was delayed another 6 hours and they broke my bag. Westjet does nothing to try and make it a better customer experience and all the customers services representatives I spoke with were useless and incompetent. Never flying westjet again.

Easy self checkin and baggage drop. No in seat entertainment, but wifi and app worked well

Overall good experience. The flight from Toronto to Denver does not have entertainment - movies to watch.

Boarding was challenging as we had to use the stairs from the tarmac. Stairs are okay but a roller bag makes it challenging.

Ensure prepaid food arrangements are appropriately understood by flight crew of who purchased and who did not

All was fine. Weather was a bit stormy, but nothing kayak can do about that! 😊

I paid for a comfort class seat and was seated in economy.

My plane was cancelled and had to be rebook for the evening was not happy.

The flight was cancelled and we had to rebook on Porter to make our cruise the next day. Air Canada has not compensated. We won’t be flying with them again. This is the second time this has happened. Also the return flight was delayed 2 hours who knows why.

Separated me and my wife and wife’s sister in far apart different seats even though I booked them all together. Just scams after scams to make us pay more. Worst airline

If you want your flight to get delayed constantly for 13+ hours and given a 10 dollar food voucher the. I would say take air canada. Worst experience ever.

My flight was cancelled and I was left to figure out where to find a hotel, something to eat and how to get a new flight at 11:30pm. Wasted a day. Thanks, Air Canada!

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

Information on your arrival and departure airports

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