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$176+ Cheap flights from Seattle (SEA) to Toronto (YTO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
Aug 28 — Sep 41
Fri 8/28
Fri 9/4
1 adult, Economy
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Find cheap flights from Seattle to Toronto with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Toronto are usually found in January or November, booked 79 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap flight deals from Seattle to Toronto

Cheapest flights from Seattle to Toronto
Explore the most affordable flight options available from Seattle to Toronto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2026.

This FlightHub deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2610:30 am
SEA
-
YYZ
1 stop9h 15m
WestJet
Wed 9/22:50 pm
YYZ
-
SEA
1 stop9h 10m
WestJet
Deal found 7/27$375
This FlightHub deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1210:30 am
SEA
-
YYZ
2 stops10h 29m
WestJet
Sat 8/1512:00 pm
YYZ
-
SEA
1 stop9h 45m
WestJet
Deal found 7/27$376
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:35 pm
SEA
-
YYZ
1 stop8h 20m
WestJet
Sun 9/61:30 pm
YYZ
-
SEA
1 stop8h 15m
WestJet
Deal found 7/27$377
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:35 pm
SEA
-
YYZ
1 stop8h 20m
WestJet
Sat 9/52:50 pm
YYZ
-
SEA
1 stop9h 10m
WestJet
Deal found 7/27$378
This FlightHub deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/217:35 pm
SEA
-
YYZ
1 stop8h 20m
WestJet
Mon 8/243:50 pm
YYZ
-
SEA
1 stop8h 10m
WestJet
Deal found 7/27$379
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/237:35 pm
SEA
-
YYZ
1 stop8h 20m
WestJet
Sun 9/61:30 pm
YYZ
-
SEA
1 stop8h 15m
WestJet
Deal found 7/27$380
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/237:35 pm
SEA
-
YYZ
1 stop8h 20m
WestJet
Sat 9/52:50 pm
YYZ
-
SEA
1 stop9h 10m
WestJet
Deal found 7/27$381
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:35 pm
SEA
-
YYZ
1 stop8h 20m
WestJet
Wed 9/23:50 pm
YYZ
-
SEA
1 stop8h 10m
WestJet
Deal found 7/27$382
This Kiwi.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/237:35 pm
SEA
-
YYZ
1 stop8h 20m
WestJet
Wed 9/23:50 pm
YYZ
-
SEA
1 stop8h 10m
WestJet
Deal found 7/27$384
This Mytrip deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1910:30 am
SEA
-
YYZ
1 stop9h 15m
WestJet
Fri 9/256:30 pm
YYZ
-
SEA
1 stop18h 10m
WestJet
Deal found 7/27$385
This flugladen.de deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/510:30 am
SEA
-
YYZ
2 stops10h 29m
WestJet
Sat 9/1212:40 pm
YYZ
-
SEA
2 stops9h 05m
WestJet
Deal found 7/24$386
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/137:35 pm
SEA
-
YYZ
1 stop7h 10m
WestJet
Tue 10/1310:20 pm
YYZ
-
SEA
2 stops14h 20m
WestJet
Deal found 7/25$387

Find flight deals from Seattle to Toronto

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Toronto (YTO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$375
(FlightHub)

One-way from

$176
(Mytrip)

Popular in

July

Cheapest in

January

Average price

$647

Good round-trip deal

$498 or less

Good one-way deal

$293 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Toronto (YTO) flights.
Search Deals
From Seattle/Tacoma Intl to Toronto (YTO)
Search Deals
One-way flight from Seattle/Tacoma Intl to Toronto (YTO)
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($150 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Toronto (YTO).
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Toronto (YTO).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Toronto that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2026.
Use the filters below to find and compare flights from Seattle to Toronto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 8/23

7:00 am-5:15 pm

1 stop7h 15m

Hamilton

Wed 8/26

6:10 pm-9:40 am

1 stop18h 30m

$413

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 8/23

7:00 am-5:15 pm

1 stop7h 15m

Hamilton

Tue 8/25

6:10 pm-9:40 am

1 stop18h 30m

$413

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 10/10

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 10/12

8:40 pm-6:45 pm

1 stop25h 05m

$422

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 10/3

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 10/11

8:40 pm-9:40 am

1 stop16h 00m

$423

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 9/9

7:35 pm-3:00 pm

1 stop16h 25m

Toronto Region of Waterloo Intl

Wed 9/16

8:40 pm-9:40 am

1 stop16h 00m

$427

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 8/22

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Tue 8/25

8:40 pm-9:40 am

1 stop16h 00m

$433

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 9/24

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 9/28

8:40 pm-9:40 am

1 stop16h 00m

$436

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 8/11

7:00 am-7:50 pm

1 stop9h 50m

Toronto Region of Waterloo Intl

Mon 8/17

8:40 pm-9:40 am

1 stop16h 00m

$450

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 9/11

10:50 am-3:00 pm

2 stops25h 10m

Toronto Region of Waterloo Intl

Fri 9/18

6:05 am-10:47 pm

2 stops19h 42m

$472

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 8/28

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Tue 9/1

8:40 pm-9:40 am

1 stop16h 00m

$472

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Showing 1-10 of 60 resultsSorted by cheapest first
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Compare providers for flights from Seattle to Toronto

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Toronto in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*2 stars
Trip.comPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Toronto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Toronto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Toronto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Toronto flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Toronto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Toronto

Have a flexible travel schedule? Discover the best time to fly to Toronto from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from Seattle to Toronto?

Currently, January is the cheapest month in which you can book a flight from Seattle to Toronto (average of $258). Flying from Seattle to Toronto in July is currently the most expensive (average of $594). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to YTO?

Find hourly flight availability from Seattle to Toronto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Toronto as you normally would.

Weekly flight availability from Seattle to Toronto

Explore weekly flight availability from Seattle to Toronto. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 29, 2026.

The most flights from SEA to YTO are scheduled on a Monday (7 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).

How much does it cost to fly round-trip from Seattle to Toronto?

Airfare is below average for this route at the moment.
Seattle to Toronto flights typically cost between $401 and $715 in August.
The cheapest round-trip price found within the last 5 days was $375 on WestJet (Aug 26-Sep 2).

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

Booking 59 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Toronto. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

The best insider tips for Seattle to Toronto flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Toronto trip
Our travel experts
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Jessica Macdonald

Jessica Macdonald

Expert on Air Canada

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has traveled to more than 50 countries across six continents.

Read more
Kaitlyn McInnis

Kaitlyn McInnis

Expert on YYZ

Kaitlyn is a guidebook author and travel writer splitting her time between Atlantic Canada and Istanbul, Türkiye. She has visited over fifty countries and all seven continents, so she is very familiar with many hotels, airports and airlines around the globe. But her favorite type of vacation is sunbathing by the sea with a good book in hand.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Reviews of airlines servicing Toronto

Get insights into the airlines that provide service to Toronto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Toronto. Reviews last updated July 29, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Delta, andUnited Airlines from Seattle to Toronto by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,726 reviews

Food

7.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle
Alaska Airlines
7.9
Good
12,726 reviews
Alaska Airlines
7.9
Good
12,726 reviews

Food

7.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle
Delta
7.8
Good
8,486 reviews
Alaska Airlines
7.9
Good
12,726 reviews

Food

7.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle
United Airlines
7.4
Good
10,050 reviews
Alaska Airlines
7.9
Good
12,726 reviews

Food

7.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle
WestJet
7.2
Good
3,415 reviews
Alaska Airlines
7.9
Good
12,726 reviews

Food

7.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle
Air Canada
7.1
Good
11,404 reviews
Alaska Airlines
7.9
Good
12,726 reviews

Food

7.0

Comfort

7.8

Boarding

8.1

Entertainment

7.0

Crew

8.5

Overall

7.9

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle

Related info for your journey

Find useful and relevant information for your journey from Seattle to Toronto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Toronto?

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to Toronto. You should not have trouble finding flights to Toronto from Seattle/Tacoma Intl; the airport handles an average of 4 outbound flights to Toronto per day. You should also have plenty of airline options to choose from since 5 airlines have flights from the Seattle airport to Toronto. It is only a 11.4 mi journey to Seattle/Tacoma Intl (SEA) from Seattle’s city center.

  • How long is the flight from Seattle to Toronto?

    There are many flights that can get you from Seattle to Toronto in 7h 15m. Fly via WestJet, Air Canada, or Delta to get the fastest option. The distance from Seattle to Toronto is about 2053 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Seattle to Toronto round-trip?

    Currently priced at $132, Air Canada will fly you from Seattle to Toronto and back. In addition to Air Canada, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and WestJet - these airlines can fly you to your destination from $142 and $228, respectively. You may be able to fly from Seattle to Toronto for 67% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Seattle to Toronto one-way?

    One-way options have recently been found by users for as low as $80 on Alaska Airlines. Other airlines that offer cheap prices include WestJet from $83 and Air Canada from $99 one-way.

  • What are the most popular routes from Seattle to Toronto?

    When deciding which route to take from Seattle to Toronto consider Seattle/Tacoma Intl - Toronto Pearson Intl, Seattle/Tacoma Intl - Toronto Island or Seattle/Tacoma Intl - Hamilton as they are the most popular.

  • What are the most reliable airlines from Seattle to Toronto?

    Consider Air Canada (97%), United Airlines (97%) or Brussels Airlines (94%) when booking your flight. These represent the most reliable airlines when flying from Seattle to Toronto.

  • What are the cheapest flights from Seattle to Toronto?

    On average you can expect to pay $941 for a flight from Seattle to Toronto. The cheapest flight overall is $204 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at $374.

  • Can I find deals for flights from Seattle to Toronto that include hotel bookings?

    Yes. In addition to deals on Seattle to Toronto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Toronto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Toronto.

  • Can I find deals for business class flights from Seattle to Toronto?

    Yes. Cheapflights offers flight deals from Seattle to Toronto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Toronto?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Toronto (average of $258). Flying from Seattle to Toronto in July is currently the most expensive (average of $594). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from Seattle to Toronto

Discover the top 5 airlines that operate flights from Seattle to Toronto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$132Average$419FlexibilityNo cancel feeOn-time67%
DeltaCheapest$142Average$419FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$228Average$353FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$250Average$465FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$277Average$446FlexibilityNo cancel feeOn-time69%

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