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Cheap flights from Seattle to Toronto from C$ 141

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 6/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
26 Nov — 3 Dec1
1 adult
1 adult, Economy, 0 bags

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 Wednesday or Sunday and return on a Thursday

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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 27 October 2025.

Sat 29/117:57 a.m.SEA - YYZ
Nonstop4h 38mAlaska Airlines
Sat 6/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Deal found 26/10C$ 313
Wed 3/123:15 p.m.SEA - YYZ
2 stops11h 43mWestJet
Wed 10/127:00 a.m.YYZ - SEA
1 stop10h 20mWestJet
Deal found 26/10C$ 318
Wed 3/123:15 p.m.SEA - YYZ
2 stops11h 43mWestJet
Tue 9/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Deal found 25/10C$ 327
Tue 2/127:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Sun 7/127:45 a.m.YYZ - SEA
1 stop9h 35mMultiple Airlines
Deal found 25/10C$ 333
Sat 29/1111:55 a.m.SEA - YYZ
2 stops8h 44mWestJet
Sat 6/1210:15 p.m.YYZ - SEA
2 stops15h 07mWestJet
Deal found 26/10C$ 336
Sat 29/117:57 a.m.SEA - YYZ
Nonstop4h 38mMultiple Airlines
Sat 6/1210:15 p.m.YYZ - SEA
2 stops15h 07mMultiple Airlines
Deal found 26/10C$ 341
Wed 3/127:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Tue 9/127:45 a.m.YYZ - SEA
1 stop9h 35mMultiple Airlines
Deal found 25/10C$ 343
Sat 6/127:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Wed 10/127:00 a.m.YYZ - SEA
1 stop10h 20mMultiple Airlines
Deal found 26/10C$ 346
Wed 3/127:55 a.m.SEA - YYZ
Nonstop4h 40mAlaska Airlines
Wed 10/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Deal found 27/10C$ 351
Thu 4/123:10 p.m.SEA - YYZ
2 stops11h 48mWestJet
Sun 7/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Deal found 27/10C$ 354
Thu 4/127:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Tue 9/127:45 a.m.YYZ - SEA
1 stop9h 35mMultiple Airlines
Deal found 25/10C$ 357
Tue 18/113:10 p.m.SEA - YYZ
2 stops12h 48mWestJet
Thu 20/118:45 p.m.YYZ - SEA
1 stop16h 37mWestJet
Deal found 27/10C$ 358

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 27 October 2025.

Round-trip from

C$ 313

One-way from

C$ 141

Popular in

June

Cheapest in

January

Average price

C$ 619

Good round-trip deal

C$ 381 or less

Good one-way deal

C$ 223 or less
Alaska Airlines
  • Alaska Airlines
  • 29/11-6/12
  • Nonstop
  • 10h 11m total
  • Seattle to Toronto
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 6/12
  • Nonstop
  • 4h 40m total
  • Seattle to Toronto
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 129 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 19 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).
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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 629,999 searches. Data last updated 27 October 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 6/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Sat 13/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 351

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 18/2

8:00 a.m.-3:35 p.m.

Nonstop4h 35m

Toronto Pearson Intl

Sat 21/2

4:45 p.m.-7:05 p.m.

Nonstop5h 20m

C$ 351

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 5/3

8:00 a.m.-3:35 p.m.

Nonstop4h 35m

Toronto Pearson Intl

Tue 10/3

4:45 p.m.-7:05 p.m.

Nonstop5h 20m

C$ 367

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 11/1

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Sat 17/1

4:45 p.m.-7:21 p.m.

Nonstop5h 36m

C$ 367

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 2/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Tue 10/3

6:20 a.m.-2:19 p.m.

1 stop10h 59m

C$ 371

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 9/4

3:10 p.m.-1:21 p.m.

1 stop19h 11m

Hamilton

Wed 15/4

6:10 p.m.-2:19 p.m.

1 stop23h 09m

C$ 374

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 10/3

8:00 a.m.-3:35 p.m.

Nonstop4h 35m

Toronto Pearson Intl

Wed 11/3

4:45 p.m.-7:05 p.m.

Nonstop5h 20m

C$ 382

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 4/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Mon 8/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 382

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 14/11

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Tue 18/11

4:45 p.m.-7:05 p.m.

Nonstop5h 20m

C$ 382

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Tue 16/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 382

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/10

Showing 1-10 of 60 results
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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 24 October 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 C$ 169). Flying from Seattle to Toronto in May is currently the most expensive (average of C$ 379). 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 27 October 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 40% on flights from Seattle to Toronto by exploring options for tickets in the afternoon.

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 27 October 2025.

The most flights from SEA to YTO are scheduled on a Monday (6 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

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

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

Calgary (YYC) – chosen by Cheapflights users on 67% of one-stop itineraries from Seattle to Toronto on Cheapflights.

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

Average round-trip fare for 1-stop flights from Seattle to Toronto, 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 C$ 397.

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

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

Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 7h 03m.

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

Average layover duration for 1-stop one-way flights from Seattle to Toronto, 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 45m.

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 27 October 2025.
See what other customers who have flown with Alaska Airlines,WestJet, andAir Canada from Seattle to Toronto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,193 reviews
Check prices

Food

7.1

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

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
11,193 reviews
Alaska Airlines
8.0
Very good
11,193 reviews
Check prices

Food

7.1

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

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
3,147 reviews
Alaska Airlines
8.0
Very good
11,193 reviews
Check prices

Food

7.1

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

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
10,367 reviews
Alaska Airlines
8.0
Very good
11,193 reviews
Check prices

Food

7.1

Entertainment

7.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

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), located 18.4 km from the city centre, is the airport you fly out of when you book flights from Seattle to Toronto. 4 airlines have flights from Seattle/Tacoma Intl to Toronto on a regular basis. Booking flights from Seattle/Tacoma Intl to Toronto should not be difficult; the airport handles an average of 5 outbound flights to Toronto per day.

  • How long is the flight from Seattle to Toronto?

    For as low as C$ 351, Alaska Airlines can have you in Toronto from Seattle in 4h 40m. Airlines will cover a distance of 3306 km. Both multi-stop and direct flights can be found to your destination and back.

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

    According to our current data, WestJet (C$ 289), Air Canada (C$ 327), and Alaska Airlines (C$ 373) offers the cheapest pricing from Seattle to Toronto. You may be able to fly from Seattle to Toronto for 48% less than the average price by searching for these airlines.

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

    For one-way options, check prices for Alaska Airlines. According to our data, you can fly for as low as C$ 141. Users have also found prices from C$ 185 and C$ 200 on WestJet and Air Canada, respectively.

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

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

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Toronto on time: Qatar Airways (97%), Alaska Airlines (97%), Air Tahiti Nui (96%).

  • What are the cheapest flights from Seattle to Toronto?

    On average you can expect to pay C$ 557 for a flight from Seattle to Toronto. The cheapest flight overall is C$ 155 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at C$ 333.

  • 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 C$ 169). Flying from Seattle to Toronto in May is currently the most expensive (average of C$ 379). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from Seattle to Toronto

Discover the top 4 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 629,999 searches. Data last updated 27 October 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 289AverageC$ 395FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 327AverageC$ 569FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Alaska AirlinesCheapestC$ 373AverageC$ 760FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 486AverageC$ 546FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Toronto?

Deals for Seattle to Toronto flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Toronto?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Toronto for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Toronto with no change fees?

Need flexible booking options for your flight to Toronto from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Toronto become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Toronto from Seattle today and book when prices fit your budget.

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