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$124+ Cheap flights from Toronto (YTO) to Seattle (SEA)

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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
YTO — SEA
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Toronto to Seattle/Tacoma Intl are usually found in February or January, booked 75 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap flight deals from Toronto to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Toronto (YTO) to Seattle (SEA). 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 September 11, 2025.

Round-trip from

$228
(Alaska Airlines)

One-way from

$124
(oojo)

Popular in

December

Cheapest in

February

Average price

$381

Good round-trip deal

$317 or less

Good one-way deal

$272 or less
From Toronto (YTO) to Seattle/Tacoma Intl
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One-way flight from Toronto (YTO) to Seattle/Tacoma Intl
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High demand for flights, 5% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Toronto (YTO) to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Toronto (YTO) to Seattle/Tacoma Intl.
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Find flight deals from Toronto to Seattle

Cheapest flights from Toronto to Seattle
Explore the most affordable flight options available from Toronto to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Trip.com deal was found by Cheapflights users on 9/9. 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.
Mon 10/66:00 amYHM - SEA
1 stop17h 29mWestJet
Sat 10/111:50 pmSEA - YHM
1 stop7h 50mWestJet
Deal found 9/9$205
This Alaska Airlines deal was found by Cheapflights users on 9/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/44:45 pmYYZ - SEA
Nonstop5h 20mAlaska Airlines
Tue 11/117:55 amSEA - YYZ
Nonstop4h 40mAlaska Airlines
Deal found 9/8$228
This Trip.com deal was found by Cheapflights users on 9/9. 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.
Tue 11/47:45 amYYZ - SEA
1 stop9h 35mMultiple Airlines
Wed 11/127:55 amSEA - YYZ
Nonstop4h 40mMultiple Airlines
Deal found 9/9$229
This Trip.com deal was found by Cheapflights users on 9/10. 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.
Tue 11/47:45 amYYZ - SEA
1 stop9h 35mMultiple Airlines
Sat 11/87:55 amSEA - YYZ
Nonstop4h 40mMultiple Airlines
Deal found 9/10$230
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 11/18:00 amYYZ - SEA
2 stops9h 38mMultiple Airlines
Sat 11/157:55 amSEA - YYZ
Nonstop4h 40mMultiple Airlines
Deal found 9/9$231
This oojo deal was found by Cheapflights users on 9/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/63:00 pmYYZ - SEA
1 stop8h 29mWestJet
Wed 10/228:40 amSEA - YYZ
1 stop9h 12mWestJet
Deal found 9/10$232
This Air Canada deal was found by Cheapflights users on 9/9. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/18:40 amYYZ - SEA
Nonstop5h 19mAir Canada
Tue 10/710:00 amSEA - YYZ
1 stop7h 30mAir Canada
Deal found 9/9$233
This oojo deal was found by Cheapflights users on 9/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/66:00 amYKF - SEA
1 stop17h 29mWestJet
Wed 10/221:50 pmSEA - YKF
1 stop7h 55mWestJet
Deal found 9/10$234
This Alaska Airlines deal was found by Cheapflights users on 9/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/44:45 pmYYZ - SEA
Nonstop5h 20mAlaska Airlines
Sun 11/97:55 amSEA - YYZ
Nonstop4h 40mAlaska Airlines
Deal found 9/8$234
This Kiwi.com deal was found by Cheapflights users on 9/9. 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 10/126:45 amYYZ - SEA
1 stop8h 50mMultiple Airlines
Sat 10/187:18 amSEA - YYZ
Nonstop4h 42mMultiple Airlines
Deal found 9/9$235
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Mon 11/36:30 amYYZ - SEA
1 stop10h 50mWestJet
Sat 11/1511:55 amSEA - YYZ
2 stops8h 44mWestJet
Deal found 9/9$236
This oojo deal was found by Cheapflights users on 9/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/116:30 pmYYZ - SEA
2 stops21h 05mWestJet
Sun 10/198:40 amSEA - YYZ
2 stops12h 51mWestJet
Deal found 9/9$237

Cheapflights Fare Finder

 
Customize your flight search to find flights from Toronto to Seattle 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 September 11, 2025.
Use the filters below to find and compare flights from Toronto to Seattle that are best for you.

Fly from

Toronto

Fly to

Seattle

Route

Depart

Return

Price

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Mon 10/6

6:00 am-8:29 pm

1 stop17h 29m

Seattle/Tacoma Intl

Sat 10/11

1:50 pm-12:40 am

1 stop7h 50m

$205

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/5

4:45 pm-7:05 pm

Nonstop5h 20m

Seattle/Tacoma Intl

Wed 11/12

7:55 am-3:35 pm

Nonstop4h 40m

$228

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/5

4:45 pm-7:05 pm

Nonstop5h 20m

Seattle/Tacoma Intl

Tue 11/11

7:55 am-3:35 pm

Nonstop4h 40m

$228

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 11/4

4:45 pm-7:05 pm

Nonstop5h 20m

Seattle/Tacoma Intl

Wed 11/12

7:55 am-3:35 pm

Nonstop4h 40m

$228

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Mon 10/6

6:00 am-8:29 pm

1 stop17h 29m

Seattle/Tacoma Intl

Wed 10/22

1:50 pm-12:45 am

1 stop7h 55m

$234

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 11/4

4:45 pm-7:05 pm

Nonstop5h 20m

Seattle/Tacoma Intl

Fri 11/14

7:55 am-3:35 pm

Nonstop4h 40m

$234

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/5

4:45 pm-7:05 pm

Nonstop5h 20m

Seattle/Tacoma Intl

Sat 11/15

7:55 am-3:35 pm

Nonstop4h 40m

$234

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/5

4:45 pm-7:05 pm

Nonstop5h 20m

Seattle/Tacoma Intl

Mon 11/10

7:55 am-3:35 pm

Nonstop4h 40m

$234

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sat 11/1

4:45 pm-7:05 pm

Nonstop5h 20m

Seattle/Tacoma Intl

Wed 11/12

7:55 am-3:35 pm

Nonstop4h 40m

$234

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 11/4

4:45 pm-7:05 pm

Nonstop5h 20m

Seattle/Tacoma Intl

Sun 11/9

7:55 am-3:35 pm

Nonstop4h 40m

$234

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 60 results
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Best time to book a flight from Toronto to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Toronto 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 Toronto to Seattle

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

Use this chart to determine the optimal time to book a round-trip flight from Toronto to Seattle. Price data was last updated on August 29, 2025.

The price you pay for your flight from Toronto to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 75 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from Toronto to Seattle (average of $238). Flying from Toronto to Seattle in June is currently the most expensive (average of $388). 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 YTO to SEA?

Find hourly flight availability from Toronto to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

A simple way to save on the total cost of your ticket is to fly from Toronto to Seattle in the evening. If you’re flexible enough to do this you can expect to save up to 52% on your trip compared to booking a flight in the morning.

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

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

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

Weekly flight availability from Toronto to Seattle

Explore weekly flight availability from Toronto to Seattle. 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 September 11, 2025.

The most flights from YTO to SEA are scheduled on a Tuesday (5 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).

What’s the top layover airport for flights from Toronto to Seattle?

Share of 1-stop round-trip flights from Toronto to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

Calgary (YYC) – chosen by Cheapflights users on 70% of 1-stop itineraries from Toronto to Seattle on Cheapflights.

What’s the cheapest layover airport for flights from Toronto to Seattle?

Average round-trip fare for 1-stop flights from Toronto to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Calgary (YYC) is the most affordable 1-stop option, with an average round-trip price of $282.

What’s the fastest layover option from Toronto to Seattle?

Shortest average travel time for 1-stop one-way flights from Toronto to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Calgary (YYC) have the shortest average one-way travel time for 1-stop routes: 7h 55m.

Which airport typically offers the quickest layover for flights from Toronto to Seattle?

Average layover duration for 1-stop one-way flights from Toronto to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Vancouver (YVR) offer the fastest connection on this route, with an average layover time of 1h 39m.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated September 11, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and United Airlines from Toronto to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Delta
8.0
Very good
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
United Airlines
7.4
Good
8,937 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
WestJet
7.2
Good
3,091 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Air Canada
7.1
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

Related info for your journey

Find useful and relevant information for your journey from Toronto to Seattle. 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 into for flights to Seattle from Toronto?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Toronto to Seattle. 6 airlines have flights to Seattle/Tacoma Intl from Toronto on a regular basis. Booking flights from Toronto to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 4 inbound flights from Toronto per day.

  • How long is the flight from Toronto to Seattle?

    Airlines like WestJet, Alaska Airlines, and Air Canada fly from Toronto to Seattle in about 5h 20m. The time it takes to get you to your destination can typically vary by up to 12h 09m. Toronto and Seattle are separated by a distance of 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 Toronto to Seattle round-trip?

    Flying on WestJet is currently your cheapest option to Seattle, with prices starting at $226. Additional round-trip tickets that might be worth considering are offered by United Airlines and Alaska Airlines, with the lowest prices starting at $240 and $243, respectively. Users have found that WestJet is 36% cheaper than the other options available to this destination.

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

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at $124. Alaska Airlines flights start at $158 while deals on United Airlines start at $164 one-way.

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

    Most travelers choose Toronto Pearson Intl - Seattle/Tacoma Intl, Toronto Island - Seattle/Tacoma Intl or Hamilton - Seattle/Tacoma Intl when deciding on the best route from Toronto to Seattle.

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

    The top 3 most reliable airlines when flying from Toronto to Seattle are Alaska Airlines (90%), Hawaiian Airlines (90%) and Air Tahiti Nui (86%).

  • What are the cheapest flights from Toronto to Seattle?

    On average you can expect to pay $420 for a flight from Toronto to Seattle. The cheapest flight overall is $167 while the most popular route, (Toronto Pearson Intl - Seattle/Tacoma Intl) is currently priced at $235.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Toronto to Seattle 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 Toronto to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Toronto to Seattle (average of $238). Flying from Toronto to Seattle in June is currently the most expensive (average of $388). 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

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Lakewood
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Lacey
Renton
Olympia
Kent
Federal Way
Cle Elum
Puyallup
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Toronto to Seattle

Discover the top 6 airlines that operate flights from Toronto to Seattle. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$226Average$283FlexibilityNo cancel feeOn-time60%
United AirlinesCheapest$240Average$461FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$243Average$381FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$247Average$446FlexibilityNo cancel feeOn-time67%
American AirlinesCheapest$277Average$277FlexibilityNo cancel feeOn-time71%
DeltaCheapest$289Average$362FlexibilityNo cancel feeOn-timeN/A

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