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Cheap flights from Seattle to Toronto from C$ 118

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 17/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
11 Oct — 18 Oct1
1 adult
1 adult, Economy

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

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 11 September 2025.

Round-trip from

C$ 287

One-way from

C$ 118

Popular in

June

Cheapest in

January

Average price

C$ 565

Good round-trip deal

C$ 724 or less

Good one-way deal

C$ 299 or less
WestJet
  • WestJet
  • 16/10-21/10
  • 2 total stops
  • 17h 49m total
  • Seattle to Toronto
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WestJet
  • WestJet
  • 17/10
  • 1 total stop
  • 7h 50m total
  • Seattle to Toronto
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Highest demand for flights based on searches. 13% potential increase in price (C$ 124 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 17 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 11 September 2025.

Thu 16/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Tue 21/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 9/9C$ 287
Sat 18/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Sat 25/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 9/9C$ 290
Wed 1/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Mon 6/106:00 a.m.YHM - SEA
1 stop17h 29mWestJet
Deal found 9/9C$ 309
Tue 21/107:05 a.m.SEA - YHM
1 stop14h 35mWestJet
Sat 25/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 9/9C$ 340
Sat 18/107:18 a.m.SEA - YYZ
Nonstop4h 42mAlaska Airlines
Sat 25/104:45 p.m.YYZ - SEA
Nonstop5h 23mAlaska Airlines
Deal found 9/9C$ 344
Thu 2/101:50 p.m.SEA - YYZ
1 stop7h 32mWestJet
Mon 13/106:30 a.m.YYZ - SEA
1 stop16h 59mWestJet
Deal found 9/9C$ 346
Fri 3/101:15 p.m.SEA - YYZ
1 stop8h 16mMultiple Airlines
Tue 21/104:45 p.m.YYZ - SEA
Nonstop5h 23mMultiple Airlines
Deal found 9/9C$ 348
Mon 20/102:05 p.m.SEA - YHM
1 stop7h 35mWestJet
Thu 23/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 10/9C$ 348
Sat 11/108:40 a.m.SEA - YYZ
1 stop7h 12mWestJet
Sat 18/101:30 p.m.YYZ - SEA
1 stop8h 51mWestJet
Deal found 10/9C$ 351
Thu 25/98:40 a.m.SEA - YYZ
1 stop7h 12mWestJet
Sat 27/912:00 p.m.YYZ - SEA
2 stops10h 21mWestJet
Deal found 9/9C$ 352
Fri 12/127:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Mon 15/127:45 a.m.YYZ - SEA
1 stop9h 35mMultiple Airlines
Deal found 9/9C$ 353
Thu 9/108:40 a.m.SEA - YYZ
1 stop24h 32mWestJet
Sun 12/106:45 a.m.YYZ - SEA
1 stop8h 50mWestJet
Deal found 9/9C$ 356

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 11 September 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

Sat 18/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

Hamilton

Sat 25/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

C$ 290

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 1/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

Hamilton

Mon 6/10

6:00 a.m.-8:29 p.m.

1 stop17h 29m

C$ 309

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Mon 20/10

2:05 p.m.-12:40 a.m.

1 stop7h 35m

Hamilton

Thu 23/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

C$ 348

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 16/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

Hamilton

Tue 21/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

C$ 355

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 28/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 1/12

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

1 stop11h 00m

C$ 356

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 19/10

7:18 a.m.-3:00 p.m.

Nonstop4h 42m

Toronto Pearson Intl

Sat 1/11

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

Nonstop5h 20m

C$ 363

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$ 363

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 3/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 17/11

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

1 stop11h 00m

C$ 363

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 5/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 17/11

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

1 stop11h 00m

C$ 363

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 3/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Sat 15/11

6:20 a.m.-2:38 p.m.

1 stop11h 18m

C$ 363

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 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 29 August 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 C$ 168). Flying from Seattle to Toronto in July is currently the most expensive (average of C$ 258). 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 11 September 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 81% on flights from Seattle to Toronto by exploring options for tickets in the evening.

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 11 September 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).

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 70% 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$ 420.

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 Calgary (YYC) offer the fastest connection on this route, with an average layover time of 1h 44m.

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 11 September 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
10,000 reviews
Check prices

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.0

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
Check prices

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.0

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
Check prices

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.0

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
Check prices

Crew

8.5

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Entertainment

7.0

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), 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$ 363, WestJet can have you in Toronto from Seattle in 4h 42m. 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, Air Canada (C$ 191), WestJet (C$ 324), and Alaska Airlines (C$ 393) offers the cheapest pricing from Seattle to Toronto. You may be able to fly from Seattle to Toronto for 66% 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 WestJet. According to our data, you can fly for as low as C$ 118. Users have also found prices from C$ 164 and C$ 169 on Air Canada and United Airlines, 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 (98%), Alaska Airlines (95%), Hawaiian Airlines (95%).

  • What are the cheapest flights from Seattle to Toronto?

    On average you can expect to pay C$ 727 for a flight from Seattle to Toronto. The cheapest flight overall is C$ 161 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at C$ 291.

  • 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$ 168). Flying from Seattle to Toronto in July is currently the most expensive (average of C$ 258). 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 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 191AverageC$ 529FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 324AverageC$ 483FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 393AverageC$ 776FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 481AverageC$ 541FlexibilityNo 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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