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$101+ 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 12/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Toronto are usually found in January or February, booked 75 days in advance, depart on a Tuesday or Wednesday and return on a Tuesday

Find 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 October 28, 2025.

This SmartFares deal was found by Cheapflights users on 10/26. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/297:57 amSEA - YYZ
Nonstop4h 38mAlaska Airlines
Sat 12/64:45 pmYYZ - SEA
Nonstop5h 33mAlaska Airlines
Deal found 10/26$224
This Trip.com deal was found by Cheapflights users on 10/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/33:15 pmSEA - YYZ
2 stops11h 43mWestJet
Wed 12/107:00 amYYZ - SEA
1 stop10h 20mWestJet
Deal found 10/26$227
This SmartFares deal was found by Cheapflights users on 10/27. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/297:57 amSEA - YYZ
Nonstop4h 38mAlaska Airlines
Tue 12/24:45 pmYYZ - SEA
Nonstop5h 33mAlaska Airlines
Deal found 10/27$229
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 11/2911:55 amSEA - YYZ
2 stops8h 44mWestJet
Tue 12/27:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 10/27$232
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 12/611:55 amSEA - YYZ
2 stops8h 44mWestJet
Wed 12/107:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 10/26$234
This Trip.com deal was found by Cheapflights users on 10/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/33:15 pmSEA - YYZ
2 stops11h 43mWestJet
Sun 12/77:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 10/27$236
This FlightHub deal was found by Cheapflights users on 10/26. 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.
Tue 12/27:55 amSEA - YYZ
Nonstop4h 40mMultiple Airlines
Sun 12/77:45 amYYZ - SEA
1 stop9h 35mMultiple Airlines
Deal found 10/26$238
This Trip.com deal was found by Cheapflights users on 10/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/123:10 pmSEA - YYZ
2 stops11h 48mWestJet
Tue 12/167:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 10/27$239
This Trip.com deal was found by Cheapflights users on 10/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2911:55 amSEA - YYZ
2 stops8h 44mWestJet
Sat 12/610:15 pmYYZ - SEA
2 stops15h 07mWestJet
Deal found 10/26$240
This Trip.com deal was found by Cheapflights users on 10/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/297:57 amSEA - YYZ
Nonstop4h 38mMultiple Airlines
Sat 12/610:15 pmYYZ - SEA
2 stops15h 07mMultiple Airlines
Deal found 10/26$244
This FlightHub deal was found by Cheapflights users on 10/26. 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.
Thu 11/207:55 amSEA - YYZ
Nonstop4h 40mMultiple Airlines
Mon 11/247:45 amYYZ - SEA
1 stop9h 35mMultiple Airlines
Deal found 10/26$245
This Trip.com deal was found by Cheapflights users on 10/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/43:10 pmSEA - YYZ
2 stops11h 48mWestJet
Sun 12/77:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 10/27$247

Cheap 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 October 28, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$224
(SmartFares)

One-way from

$101
(Alaska Airlines)

Popular in

June

Cheapest in

January

Average price

$442

Good round-trip deal

$342 or less

Good one-way deal

$262 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. 14% potential increase in price ($66 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 October 28, 2025.
Use the filters below to find and compare flights from Seattle to Toronto that are best for you.

Fly from

Seattle

Fly to

Toronto

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 11/15

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Wed 11/19

4:45 pm-7:05 pm

Nonstop5h 20m

$251

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 12/6

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Sat 12/13

4:45 pm-7:18 pm

Nonstop5h 33m

$251

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 2/18

8:00 am-3:35 pm

Nonstop4h 35m

Toronto Pearson Intl

Sat 2/21

4:45 pm-7:05 pm

Nonstop5h 20m

$251

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 2/18

8:00 am-3:35 pm

Nonstop4h 35m

Toronto Pearson Intl

Mon 2/23

4:45 pm-7:05 pm

Nonstop5h 20m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 11/19

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Fri 11/21

4:45 pm-7:17 pm

Nonstop5h 32m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 1/11

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Sat 1/17

4:45 pm-7:21 pm

Nonstop5h 36m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 2/15

8:00 am-3:35 pm

Nonstop4h 35m

Toronto Pearson Intl

Tue 2/17

4:45 pm-7:05 pm

Nonstop5h 20m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 3/10

8:00 am-3:35 pm

Nonstop4h 35m

Toronto Pearson Intl

Wed 3/11

4:45 pm-7:05 pm

Nonstop5h 20m

$273

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 1/15

3:10 pm-1:22 pm

1 stop19h 12m

Hamilton

Sun 1/18

6:10 pm-2:20 pm

1 stop23h 10m

$295

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 2/18

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 2/23

6:20 am-2:19 pm

1 stop10h 59m

$296

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

Showing 1-10 of 60 results
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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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
SmartFaresPrice Accuracy1 starTrust Score*1 star

*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 Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Seattle-Toronto flight deals on Cheapflights vs. Mytrip >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 Mytrip the most. Mytrip 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

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Toronto. Price data was last updated on October 24, 2025.

Booking 75 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.

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

Currently, March is the cheapest month in which you can book a flight from Seattle to Toronto (average of $121). Flying from Seattle to Toronto in May is currently the most expensive (average of $271). 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 October 28, 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Toronto in the afternoon. If you’re flexible enough to do this you can expect to save up to 57% on your trip compared to booking a flight in the evening.

What is the cheapest day to fly from Seattle to Toronto?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Toronto. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Seattle to Toronto flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Seattle to Toronto flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-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.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to Toronto trip
Airlines
Alaska Airlines

Alaska's Premium Class offers extra legroom and free cocktails, enhancing comfort on medium-haul flights.


Alaska's Wi-Fi is a flat fee, ideal for business travelers needing connectivity on longer flights.

Read more about Alaska Airlinesby Robert Schrader
Air Canada

Air Canada's Preferred Seats offer up to four extra inches of space, ideal for taller travelers.


Air Canada's in-flight entertainment includes 2,500 hours of content, perfect for long flights.

Read more about Air Canadaby Jessica Macdonald
Airports
SEA

Use SEA Spot Saver to book security screening appointments in advance, reducing wait times. Reserve up to five days before your flight.

Read more about SEAby Brandon Schultz
YYZ

For a budget-friendly trip to downtown Toronto, take the TTC express buses connecting to the subway. It's economical and easy to navigate.

Read more about YYZby Kaitlyn McInnis
Our travel experts
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

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

Jessica Macdonald

Jessica Macdonald

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 McInnis

Kaitlyn McInnis

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

Brandon Schultz

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 October 28, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Delta, and United 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
8.0
Very good
11,199 reviews

Crew

8.5

Entertainment

7.0

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,199 reviews
Alaska Airlines
8.0
Very good
11,199 reviews

Crew

8.5

Entertainment

7.0

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
7,995 reviews
Alaska Airlines
8.0
Very good
11,199 reviews

Crew

8.5

Entertainment

7.0

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
8,996 reviews
Alaska Airlines
8.0
Very good
11,199 reviews

Crew

8.5

Entertainment

7.0

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
WestJet
7.2
Good
3,148 reviews
Alaska Airlines
8.0
Very good
11,199 reviews

Crew

8.5

Entertainment

7.0

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Air Canada
7.1
Good
10,370 reviews
Alaska Airlines
8.0
Very good
11,199 reviews

Crew

8.5

Entertainment

7.0

Overall

8.0

Boarding

8.1

Comfort

7.8

Food

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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 3 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 4h 40m. Fly via Alaska Airlines, WestJet, or Air Canada to get the fastest option. The distance from Seattle to Toronto is about 2054 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 $165, 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 $182 and $222, respectively. You may be able to fly from Seattle to Toronto for 58% 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 $101 on Alaska Airlines. Other airlines that offer cheap prices include WestJet from $132 and Air Canada from $143 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 - Hamilton or Seattle/Tacoma Intl - Toronto Island as they are the most popular.

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

    Consider Qatar Airways (97%), Alaska Airlines (97%) or Air Tahiti Nui (96%) 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 $1,025 for a flight from Seattle to Toronto. The cheapest flight overall is $111 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at $227.

  • 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, March is the cheapest month in which you can book a flight from Seattle to Toronto (average of $121). Flying from Seattle to Toronto in May is currently the most expensive (average of $271). 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

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Alternative routes for Seattle to Toronto

See prices for flight routes from nearby airports that may be better suited for you.
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Bellingham to Ottawa flights
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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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$165Average$444FlexibilityNo cancel feeOn-time67%
DeltaCheapest$182Average$433FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$222Average$300FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$273Average$482FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$301Average$387FlexibilityNo cancel feeOn-time69%

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