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$117+ 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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 89 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

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 July 29, 2025.

Round-trip from

$243
(iWofly)

One-way from

$117
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$490

Good round-trip deal

$464 or less

Good one-way deal

$207 or less
From Seattle/Tacoma Intl to Toronto (YTO)
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One-way flight from Seattle/Tacoma Intl to Toronto (YTO)
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Highest demand for flights based on searches. 13% potential increase in price ($63 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Toronto (YTO).
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Toronto (YTO).
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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 July 29, 2025.

This iWofly deal was found by Cheapflights users on 7/29. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/121:15 pmSEA - YYZ
1 stop8h 16mWestJet
Fri 9/1912:00 pmYYZ - SEA
2 stops11h 29mWestJet
Deal found 7/29$243
This Flightnetwork deal was found by Cheapflights users on 7/28. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/115:30 amSEA - YTZ
2 stops10h 15mAir Canada
Thu 9/184:10 pmYTZ - SEA
2 stops9h 06mAir Canada
Deal found 7/28$249
This Air Canada deal was found by Cheapflights users on 7/29. 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.
Tue 9/912:00 pmSEA - YYZ
Nonstop4h 44mAir Canada
Wed 9/178:40 amYYZ - SEA
Nonstop5h 19mAir Canada
Deal found 7/29$267
This Trip.com deal was found by Cheapflights users on 7/26. 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.
Tue 8/192:05 pmSEA - YKF
1 stop7h 41mWestJet
Fri 8/226:00 amYKF - SEA
1 stop9h 58mWestJet
Deal found 7/26$277
This Trip.com deal was found by Cheapflights users on 7/29. 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 9/127:16 amSEA - YYZ
Nonstop4h 44mMultiple Airlines
Fri 9/193:00 pmYYZ - SEA
1 stop8h 29mMultiple Airlines
Deal found 7/29$293
This Trip.com deal was found by Cheapflights users on 7/26. 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.
Tue 8/192:05 pmSEA - YHM
1 stop7h 36mWestJet
Fri 8/226:00 amYHM - SEA
1 stop9h 58mWestJet
Deal found 7/26$296
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.
Wed 9/107:15 pmSEA - YKF
3 stops31h 15mMultiple Airlines
Wed 9/176:30 amYKF - SEA
2 stops18h 46mMultiple Airlines
Deal found 7/27$306
This Mytrip deal was found by Cheapflights users on 7/28. 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.
Thu 9/115:30 amSEA - YTZ
2 stops12h 11mMultiple Airlines
Thu 9/185:30 pmYTZ - SEA
3 stops18h 52mMultiple Airlines
Deal found 7/28$343
This Mytrip deal was found by Cheapflights users on 7/29. 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.
Fri 9/121:15 pmSEA - YHM
1 stop7h 33mMultiple Airlines
Fri 9/192:55 pmYHM - SEA
2 stops10h 21mMultiple Airlines
Deal found 7/29$359

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, 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

Fri 9/12

1:15 pm-12:31 am

1 stop8h 16m

Toronto Pearson Intl

Fri 9/19

12:00 pm-8:29 pm

2 stops11h 29m

$243

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Thu 9/11

5:30 am-6:45 pm

2 stops10h 15m

Toronto Island

Thu 9/18

4:10 pm-10:16 pm

2 stops9h 06m

$249

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/9

2:55 pm-1:06 am

1 stop7h 11m

Toronto Pearson Intl

Wed 9/17

8:40 am-10:59 am

Nonstop5h 19m

$267

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 8/19

2:05 pm-12:46 am

1 stop7h 41m

Toronto Region of Waterloo Intl

Fri 8/22

6:00 am-12:58 pm

1 stop9h 58m

$277

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 9/12

7:16 am-3:00 pm

Nonstop4h 44m

Toronto Pearson Intl

Fri 9/19

3:00 pm-8:29 pm

1 stop8h 29m

$293

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 8/19

2:05 pm-12:41 am

1 stop7h 36m

Hamilton

Fri 8/22

6:00 am-12:58 pm

1 stop9h 58m

$296

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 9/10

7:15 pm-5:30 am

3 stops31h 15m

Toronto Region of Waterloo Intl

Wed 9/17

6:30 am-10:16 pm

2 stops18h 46m

$306

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Thu 9/11

5:30 am-8:41 pm

2 stops12h 11m

Toronto Island

Thu 9/18

5:30 pm-9:22 am

3 stops18h 52m

$343

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 9/12

1:15 pm-11:48 pm

1 stop7h 33m

Hamilton

Fri 9/19

2:55 pm-10:16 pm

2 stops10h 21m

$359

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 8/26

7:35 pm-6:12 am

1 stop7h 37m

$117

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 20 results
1
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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 July 25, 2025.

Booking 87 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, January is the cheapest month in which you can book a flight from Seattle to Toronto (average of $243). Flying from Seattle to Toronto in August is currently the most expensive (average of $348). 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, 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 55% on your trip compared to booking a flight in the morning.

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 Tuesday afternoons when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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, 2025.

The most flights from SEA to YTO are scheduled on a Thursday (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

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, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Delta, and WestJet 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
10,000 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,979 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
WestJet
7.2
Good
2,972 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Air Canada
7.1
Good
9,826 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Crew

8.5

Boarding

8.1

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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 6 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.

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

    Currently priced at $243, WestJet will fly you from Seattle to Toronto and back. In addition to WestJet, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on Air Canada for as low as $249. You may be able to fly from Seattle to Toronto for 41% 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 $117 on WestJet. Other airlines that offer cheap prices include Air Canada from $118 and Alaska Airlines from $122 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 Qatar Airways (97%), Alaska Airlines (92%) or Hawaiian Airlines (92%) 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 $1,543 for a flight from Seattle to Toronto. The cheapest flight overall is $128 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at $242.

  • 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 $243). Flying from Seattle to Toronto in August is currently the most expensive (average of $348). 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.

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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.
Seattle to Pearson Intl flights
Seattle to Pierre Elliott Trudeau Intl flights
Seattle to Toronto Island flights
Seattle to Hamilton flights
Portland to Pearson Intl flights
Seattle to Region of Waterloo Intl flights
Portland to Pierre Elliott Trudeau Intl flights
Portland to Toronto Island flights
Seattle to Ottawa flights
Portland to Ottawa flights
Seattle to Thunder Bay flights
Spokane to Pearson Intl flights
Pasco to Pearson Intl flights
Spokane to Hamilton flights
Bellingham to Pearson Intl flights
Seattle to London flights
Pasco to Pierre Elliott Trudeau Intl flights
Bellingham to Ottawa flights
Seattle to Timmins flights
Walla Walla to Pierre Elliott Trudeau Intl flights
Bellingham to Pierre Elliott Trudeau Intl flights

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, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$128Average$463FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$158Average$399FlexibilityNo cancel feeOn-time69%
DeltaCheapest$186Average$447FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$236Average$313FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$273Average$486FlexibilityNo cancel feeOn-time75%

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