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$86+ 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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
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 Wednesday

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 septiembre 11, 2025.

Round-trip from

$223
(oojo)

One-way from

$86
(oojo)

Popular in

June

Cheapest in

January

Average price

$408

Good round-trip deal

$398 or less

Good one-way deal

$154 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. 14% potential increase in price ($65 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 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 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 septiembre 11, 2025.

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.
mié. 10/11:50 pmSEA - YHM
1 stop7h 50mWestJet
lun. 10/66:00 amYHM - SEA
1 stop17h 29mWestJet
Deal found 9/9$223
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.
sáb. 10/181:50 pmSEA - YHM
1 stop7h 50mWestJet
sáb. 10/256:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/10$242
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.
vie. 10/241:50 pmSEA - YHM
1 stop7h 50mWestJet
dom. 10/266:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 9/9$245
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.
lun. 10/202:05 pmSEA - YHM
1 stop7h 35mWestJet
jue. 10/236:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/10$251
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 10/118:40 amSEA - YYZ
1 stop7h 12mWestJet
sáb. 10/181:30 pmYYZ - SEA
1 stop8h 51mWestJet
Deal found 9/10$253
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.
sáb. 11/111:55 amSEA - YYZ
2 stops8h 44mMultiple Airlines
dom. 11/164:45 pmYYZ - SEA
Nonstop5h 20mMultiple Airlines
Deal found 9/9$254
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.
lun. 11/311:55 amSEA - YYZ
1 stop16h 03mMultiple Airlines
sáb. 11/154:45 pmYYZ - SEA
Nonstop5h 20mMultiple Airlines
Deal found 9/9$255
This Trip.com deal was found by Cheapflights users on 9/11. 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.
lun. 10/202:05 pmSEA - YYZ
1 stop7h 17mWestJet
jue. 10/236:30 amYYZ - SEA
1 stop9h 29mWestJet
Deal found 9/11$256
This Trip.com deal was found by Cheapflights users on 9/11. 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.
jue. 10/161:50 pmSEA - YHM
1 stop7h 50mWestJet
mar. 10/216:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/11$256
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/151:02 pmSEA - YYZ
2 stops14h 10mMultiple Airlines
lun. 10/208:00 amYYZ - SEA
1 stop7h 59mMultiple Airlines
Deal found 9/10$257
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.
vie. 11/283:10 pmSEA - YKF
1 stop11h 18mWestJet
lun. 12/16:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 9/10$257
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
lun. 10/202:05 pmSEA - YYZ
1 stop7h 17mWestJet
dom. 11/27:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 9/11$258

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 septiembre 11, 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

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

mié. 10/1

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

lun. 10/6

6:00 am-8:29 pm

1 stop17h 29m

$223

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

sáb. 10/18

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

sáb. 10/25

6:00 am-12:59 pm

1 stop9h 59m

$242

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

vie. 10/24

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

dom. 10/26

6:10 pm-2:20 pm

1 stop23h 10m

$245

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

lun. 10/20

2:05 pm-12:40 am

1 stop7h 35m

Hamilton

jue. 10/23

6:00 am-12:59 pm

1 stop9h 59m

$256

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

jue. 10/16

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

mar. 10/21

6:00 am-12:59 pm

1 stop9h 59m

$256

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

vie. 11/28

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

lun. 12/1

6:20 am-2:20 pm

1 stop11h 00m

$257

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

dom. 10/19

7:18 am-3:00 pm

Nonstop4h 42m

Toronto Pearson Intl

sáb. 11/1

4:45 pm-7:05 pm

Nonstop5h 20m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mar. 10/21

7:18 am-3:00 pm

Nonstop4h 42m

Toronto Pearson Intl

lun. 11/3

4:45 pm-7:05 pm

Nonstop5h 20m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mar. 11/18

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

dom. 11/23

4:45 pm-7:17 pm

Nonstop5h 32m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

lun. 11/3

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

sáb. 11/15

4:45 pm-7:05 pm

Nonstop5h 20m

$262

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 60 results
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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

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 August 29, 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, 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 septiembre 11, 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 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.

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 septiembre 11, 2025.

The most flights from SEA to YTO are scheduled on a Thursday (7 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 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 septiembre 11, 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
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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.
United Airlines
7.4
Good
8,937 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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
3,091 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

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 5 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 42m. Fly via WestJet, Alaska Airlines, 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 $128, 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 United Airlines and Delta - these airlines can fly you to your destination from $160 and $186, respectively. You may be able to fly from Seattle to Toronto for 68% 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 $99 on WestJet. Other airlines that offer cheap prices include Air Canada from $118 and United Airlines from $127 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 Region of Waterloo Intl as they are the most popular.

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

    Consider Qatar Airways (98%), Alaska Airlines (95%) or Hawaiian Airlines (95%) 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 $414 for a flight from Seattle to Toronto. The cheapest flight overall is $132 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at $210.

  • 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.

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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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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$128Average$453FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$160Average$387FlexibilityNo cancel feeOn-time69%
DeltaCheapest$186Average$427FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$235Average$302FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$276Average$504FlexibilityNo cancel feeOn-time75%

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