SEA - YTO

$158 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 9/6. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$369
Typical prices: $503-$295
WestJet
Fri 10/2Wed 10/7
SEA - YYZ • 1 stop
Cheapest non-stop
$568
Typical prices: $593-$350
Alaska Airlines
Tue 9/1Wed 9/9
SEA - YYZ • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
United Economy Plus adds up to six inches more legroom than standard economy.
Air Canada Preferred Economy offers up to four extra inches of legroom.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $369 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Air Canada and Alaska Airlines. Average duration is 4h 45m
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 $272 (round-trip)
Shortest trip • 6h 59m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 51% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 28% price drop
Most popular
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

Fri, Oct 2 - Wed, Oct 7
WestJet Logo
7:35 pm - 5:45 am
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
1:30 pm - 6:45 pm
YYZ
-
SEA
8h 15m
1 stop
$369WestJet
Thu, Jul 2 - Tue, Jul 14
WestJet Logo
7:00 am - 5:10 pm
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
1:30 pm - 6:45 pm
YYZ
-
SEA
8h 15m
1 stop
$370WestJet
Tue, Jul 7 - Tue, Jul 14
WestJet Logo
7:35 pm - 5:45 am
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
1:30 pm - 6:45 pm
YYZ
-
SEA
8h 15m
1 stop
$374WestJet
Thu, Sep 24 - Mon, Sep 28
WestJet Logo
7:35 pm - 5:45 am
SEA
-
YYZ
7h 10m
1 stop
WestJet Logo
1:30 pm - 6:45 pm
YYZ
-
SEA
8h 15m
1 stop
$377WestJet
Tue, Jun 30 - Wed, Jul 8
WestJet Logo
7:35 pm - 6:55 am
SEA
-
YYZ
8h 20m
1 stop
WestJet Logo
3:50 pm - 9:00 pm
YYZ
-
SEA
8h 10m
1 stop
$378WestJet
Sun, Aug 23 - Fri, Sep 4
WestJet Logo
7:00 am - 9:10 pm
SEA
-
YYZ
11h 10m
2 stops
WestJet Logo
1:30 pm - 6:45 pm
YYZ
-
SEA
8h 15m
1 stop
$379WestJet
Mon, Sep 28 - Wed, Sep 30
United Airlines Logo
11:14 pm - 6:42 pm
SEA
-
YTZ
16h 28m
1 stop
United Airlines Logo
7:20 pm - 9:36 am
YTZ
-
SEA
17h 16m
1 stop
$466United Airlines
Mon, Sep 28 - Wed, Sep 30
United Airlines Logo
5:21 pm - 10:06 am
SEA
-
YTZ
13h 45m
2 stops
United Airlines Logo
7:20 pm - 9:36 am
YTZ
-
SEA
17h 16m
1 stop
$476United Airlines
Fri, Aug 28 - Tue, Sep 1
United Airlines Logo
11:00 pm - 10:06 am
SEA
-
YTZ
8h 06m
1 stop
United Airlines Logo
7:20 pm - 9:36 am
YTZ
-
SEA
17h 16m
1 stop
$487United Airlines
Tue, Sep 22 - Sun, Sep 27
Multiple Airlines Logo
12:16 am - 2:25 pm
SEA
-
YTZ
11h 09m
1 stop
Multiple Airlines Logo
8:40 pm - 8:30 am
YTZ
-
SEA
14h 50m
1 stop
$521Multiple Airlines
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 $469 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.

If your flying dates are flexible, you should consider flying to Toronto on a Tuesday, 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 Seattle to Toronto. For your return ticket, we recommend flying on a Thursday and avoiding Mondays for the best deals.

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 $88 (return) on average. On the other hand, the most expensive months are May and August, where the average cost of round-trip tickets is $159 and $153 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 $493 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
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.

Stefanie Waldek

Stefanie Waldek

Expert on Air Canada, United Airlines and YYZ

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.

Good to know

Low seasonFebruary
Cheapest flight$158
Best time to beat the crowds with an average 22% drop in price.
Most popular time to fly with an average 27% increase in price.
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 $158 for a one-way ticket and $369 for a round-trip.

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

    Yes

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

    When flying out of Seattle you will be using Seattle/Tacoma Intl. You will be landing at one of these airports: Toronto Region of Waterloo Intl, Toronto Island, 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?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Seattle to Toronto are Alaska Airlines and Delta. With an average price for the route of $450 and an overall rating of 7.9, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $461 and an overall rating of 7.9.

  • 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 $392 or less one-way and $611 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 direct 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 direct flights

Reviews of the top 5 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.
7.9
Alaska AirlinesOverall score based on 12479 reviews
8.5Crew
7.8Comfort
7.0Food
8.1Boarding
7.0Entertainment
Airline reviews

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.

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

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.

Check in & bag drop was straightforward. Alaskair changed the gate approx 40 min before departure, and I only became aware due to Google wallet update to my boarding pass. Had to move from gate N1 to C9 which required use of the Train, luckily I had time available.

Very short leg - too short for any meals/snacks or entertainment.

Super impressed by staff courtesy, and assistance, Flight was one of the best I've had despite turbulence... Will definitely be flying Alaskan air as my preferred choice

My boarding passes were pulled from my Apple wallet and my 3 family members who were all sitting together in the same row all got put middle seats and were one of the last to board and barely were able to get our bags in the luggage bins.

Was disappointed not to have known Alaska Air offers no music, no flight aware, no films.

I was surprised by everything. The cleanliness, the punctuality, the friendliness of the crew… and the Wi-Fi! Please keep up the good work.

The flight attendant and first class were very friendly, efficient, and wanted to make sure that service was great. Highly recommend this airline.

Thank you to everyone, the crew and pilots.. they were so amazing!!

Only beverages were offered to first class and I thought the flight attendant could have also served the Delta Comfort as well instead of sitting down and staring at her phone and walking past all of us to the back of the plane to charge her phone more. There was a complete lack of turbulence and was safe enough for flights attendant to walk around in the front of the plane, collect trash and serve a few people water and turn off the seat belt light. Also didn’t enforce people putting their seats into the upright position and allowed two passengers to remain reclined during landing. They seemed out to lunch completely. Usually my experience on Delta is much better.

Long story short, it was one of the better flight experiences I've had in some time when compared with other airlines.

Flight was great! This flight from Atlanta was even better than when I paid for Comfort from SNA to Atlanta.

The Boarding process was great. Particularly since my wife and I require assistance. The flight attendants were amazing. We travel frequently; they honestly were a cut above. 😀

Crew was nice, meal was good. Entertainment had to be rebooted 3 times and still did not work. Turns out there was residue on screen, it needed to be cleaned to prevent the touchscreen buttons from continuously activating. I had entertainment for the last 45 minutes of a 5 hour 45 minute flight. Really unacceptable for first class. Flight attendent indicated your cleaning solution creates this problem. Seems as if this is widely known, you should be using a different product or cleaning better. Really really disappointing which simply added to the wi fi on your planes with reliably never ever works.

Snacks and included beverages were appreciated. Boarding went smoothly. Plenty of overhead bin space. Seats get very uncomfortable after a couple of hours. After waiting 10 painful minutes for my walker, a very nice Delta guest agent pushed me in a wheelchair to the gate. It was finally delivered to me after another 15 minutes . Our checked bag was on the carousel long b4 I was able to retrieve it. Fortunately it was still there but somewhere along the way the straps we used to secure it were removed and and were not reattached. Wish I had made note of the agents name.

It was fine. 55 minute flight. No snacks or beverage service offered. Boarding went smoothly and my walker was waiting for me on the jet way.

The cabin temperature was nice and cool. The wifi was not working.

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

First flight out and was 85 minutes delayed. Notification came out way too late

I felt scammed. The priced advertised was different than what I paid. I paid the whole some online. I then got a call 20 minutes later saying I need to paid 70 more person. She said the price online is not the guaranteed price.

Very comfortable seating and the Flight staff were very attentive. The premium economy section that I was seated in was very clean, updated, and well appointed. I would highly recommend flying United Airlines as this experience was better than the Japan Airlines business class that I flew several months ago.

Some crew were unfriendly or in some cases just straight up rude.

Putting people that close to the bathroom, where you have to look into the bathroom as people are exiting and entering was not great and the smell was also not great. I know the airlines are desperate for more chairs, but that seat is a crime.

one staffer was frustrated (it happen); the flight was late and the pilot mentioned they'll make amend but the snacks were the same, other than that the aircraft was clean and everything went smooth, no complaints

ticket agent lady wás very helpful , she arranged wheel chair for my elderly mother

Entertainment kept turning itself off. Gave up on watching a movie.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Not United Airlines' fault. It's ORL airport's fault.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

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.

No TV on the flight. The charging outlet was not working. No food, even a sandwich. The served orange was poor quality.

Selected seats 5 months prior to date. Had email confirmation and seats were not honoured. Family did not sit together

They did not let us board because one member needed a transit visa, which was not evident at the time of ticket purchase.

I was charge a baggage checking fee $68!! I volunteered to check my duffle bag which usually goes under my seat!

I did not like anything because the flight was cancelled yesterday and I did not get to arrive on time in Toronto as I was rebooked with another airline. This caused me to be really stressed out as I am an individual with back injury and to be forced to stay longer in an airport to accommodate a change of airline and the transfers associated with it Due to this I am probably not going to book through your website to eliminate this potentially chaos in the future

shittiest airline in the hemisphere. To improve - start thinking you're flying people, not cattle

Easy boarding, inflight refreshments came on time and comfortable seat

It was good that our flight left early. It was a nice smooth flight and landing.

All good……but luggage didn’t make it on the airplane. Had to wait 3 days. Was a bummer.

Small suitcase used for carryon the last time was refused by boarding crew this time. Appears to be at the discretion and mood of the person on the day. Flight was only half booked, there would have been no problem with space.

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

Information on your arrival and departure airports