Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Seattle to Toronto from C$ 248

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
28 Aug — 4 Sep1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Toronto are usually found in January or November, booked 79 days in advance, depart on a Thursday or Wednesday and return on a Thursday

Cheap flight deals from Seattle to Toronto

Enter your travel dates to find the best prices.

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 29 July 2026.

Wed 26/810:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Wed 2/92:50 p.m.
YYZ
-
SEA
1 stop9h 10m
WestJet
Deal found 27/7C$ 529
Wed 12/810:30 a.m.
SEA
-
YYZ
2 stops10h 29m
WestJet
Sat 15/812:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Deal found 27/7C$ 530
Sat 22/87:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Sun 6/91:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Deal found 27/7C$ 532
Sat 22/87:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Sat 5/92:50 p.m.
YYZ
-
SEA
1 stop9h 10m
WestJet
Deal found 27/7C$ 533
Fri 21/87:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Mon 24/83:50 p.m.
YYZ
-
SEA
1 stop8h 10m
WestJet
Deal found 27/7C$ 535
Sun 23/87:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Sun 6/91:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Deal found 27/7C$ 536
Sun 23/87:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Sat 5/92:50 p.m.
YYZ
-
SEA
1 stop9h 10m
WestJet
Deal found 27/7C$ 538
Sat 22/87:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Wed 2/93:50 p.m.
YYZ
-
SEA
1 stop8h 10m
WestJet
Deal found 27/7C$ 539
Sun 23/87:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Wed 2/93:50 p.m.
YYZ
-
SEA
1 stop8h 10m
WestJet
Deal found 27/7C$ 542
Sat 19/910:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Fri 25/96:30 p.m.
YYZ
-
SEA
1 stop18h 10m
WestJet
Deal found 27/7C$ 543
Sat 5/910:30 a.m.
SEA
-
YYZ
2 stops10h 29m
WestJet
Sat 12/912:40 p.m.
YYZ
-
SEA
2 stops9h 05m
WestJet
Deal found 24/7C$ 545
Sun 13/97:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Tue 13/1010:20 p.m.
YYZ
-
SEA
2 stops14h 20m
WestJet
Deal found 25/7C$ 546

Find 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 29 July 2026.

Round-trip from

C$ 529

One-way from

C$ 248

Popular in

July

Cheapest in

January

Average price

C$ 913

Good round-trip deal

C$ 913 or less

Good one-way deal

C$ 444 or less
WestJet
  • WestJet
  • 26/8-2/9
  • 2 total stops
  • 18h 25m total
  • Seattle to Toronto
Search Deals
WestJet
  • WestJet
  • 23/8
  • 1 total stop
  • 7h 15m total
  • Seattle to Toronto
Search Deals
Highest demand for flights based on searches. 26% potential increase in price (C$ 298 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (C$ 43 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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 629,999 searches. Data last updated 29 July 2026.
Use the filters below to find and compare flights from Seattle to Toronto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 23/8

7:00 a.m.-5:15 p.m.

1 stop7h 15m

Hamilton

Tue 25/8

6:10 p.m.-9:40 a.m.

1 stop18h 30m

C$ 583

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 24/9

7:35 p.m.-5:15 p.m.

1 stop18h 40m

Hamilton

Sun 27/9

6:10 p.m.-9:40 a.m.

1 stop18h 30m

C$ 602

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 22/8

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Tue 25/8

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 611

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 11/8

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Mon 24/8

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 611

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 24/9

7:35 p.m.-5:15 p.m.

1 stop18h 40m

Hamilton

Mon 28/9

6:10 p.m.-9:40 a.m.

1 stop18h 30m

C$ 615

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 24/9

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 28/9

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 615

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 8/10

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 12/10

8:40 p.m.-6:45 p.m.

1 stop25h 05m

C$ 617

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 11/8

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Fri 21/8

8:40 p.m.-6:45 p.m.

1 stop25h 05m

C$ 633

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 11/8

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Tue 25/8

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 635

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 1/10

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 5/10

8:40 p.m.-6:45 p.m.

1 stop25h 05m

C$ 638

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/7

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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

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 C$ 364). Flying from Seattle to Toronto in July is currently the most expensive (average of C$ 838). 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 29 July 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Toronto as you normally would.

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 29 July 2026.

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

How much does it cost to fly round-trip from Seattle to Toronto?

Airfare is below average for this route at the moment.
Seattle to Toronto flights typically cost between C$ 566 and C$ 1,009 in August.
The cheapest round-trip price found within the last 5 days was C$ 529 on WestJet (26 Aug-2 Sep).

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 82% 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$ 386.

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 Calgary (YYC) have the shortest average one-way travel time for 1-stop routes: 7h 24m.

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.

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

Booking 59 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.

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 29 July 2026.
See what other customers who have flown with Alaska Airlines and WestJet 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
7.9
Good
12,727 reviews
Check prices

Boarding

8.1

Crew

8.5

Overall

7.9

Comfort

7.8

Food

7.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle
Alaska Airlines
7.9
Good
12,727 reviews
Alaska Airlines
7.9
Good
12,727 reviews
Check prices

Boarding

8.1

Crew

8.5

Overall

7.9

Comfort

7.8

Food

7.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle
WestJet
7.2
Good
3,415 reviews
Alaska Airlines
7.9
Good
12,727 reviews
Check prices

Boarding

8.1

Crew

8.5

Overall

7.9

Comfort

7.8

Food

7.0

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Anonymous,Jul 2026

SEA - LHR

Alaska has a brilliant crew. And the seats are good. As much as i loved my trip from Heathrow to Seattle, i definitely did not feel the same on the return flight. A lot was due to feeling very cramped and unfortunately for me, i had a kicker behind me and a passenger who did not stop moving (but constantly) next to me. The good was not good and i noticed that most people around me left most of their meal. The ice cream was very nice. I did not have breakfast. However the food was very nice on the way to Seattle

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. 3 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 4 outbound flights to Toronto per day.

  • How long is the flight from Seattle to Toronto?

    For as low as C$ 583, WestJet can have you in Toronto from Seattle in 7h 15m. Airlines will cover a distance of 3304 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, Air Canada (C$ 264), Alaska Airlines (C$ 287), and WestJet (C$ 291) offers the cheapest pricing from Seattle to Toronto. You may be able to fly from Seattle to Toronto for 54% 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$ 131. Users have also found prices from C$ 141 and C$ 147 on Air Canada and WestJet, 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: Air Canada (97%), United Airlines (97%), Brussels Airlines (94%).

  • What are the cheapest flights from Seattle to Toronto?

    On average you can expect to pay C$ 872 for a flight from Seattle to Toronto. The cheapest flight overall is C$ 444 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at C$ 528.

  • 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 C$ 364). Flying from Seattle to Toronto in July is currently the most expensive (average of C$ 838). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 3 airlines flying from Seattle to Toronto

Discover the top 3 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 29 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 264AverageC$ 549FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Alaska AirlinesCheapestC$ 287AverageC$ 788FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
WestJetCheapestC$ 291AverageC$ 447FlexibilityNo cancel feeOn-time60%
Search WestJet 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.