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Cheap flights from Seattle to Toronto from C$ 134

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 14/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
25 Feb — 4 Mar1
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 75 days in advance, depart on a Wednesday or Thursday 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 26 January 2026.

Tue 10/38:10 a.m.
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Tue 17/38:00 a.m.
YYZ
-
SEA
1 stop10h 01m
Air Canada
Deal found 24/1C$ 301
Sat 21/28:00 a.m.
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Sat 28/28:00 a.m.
YYZ
-
SEA
1 stop9h 31m
Air Canada
Deal found 23/1C$ 304
Sat 14/38:10 a.m.
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Tue 17/38:00 a.m.
YYZ
-
SEA
1 stop10h 01m
Air Canada
Deal found 25/1C$ 305
Tue 10/37:55 a.m.
SEA
-
YYZ
Nonstop4h 40m
Alaska Airlines
Tue 17/34:45 p.m.
YYZ
-
SEA
Nonstop5h 33m
Alaska Airlines
Deal found 24/1C$ 311
Sat 28/28:00 a.m.
SEA
-
YYZ
Nonstop4h 43m
Multiple Airlines
Sat 7/34:45 p.m.
YYZ
-
SEA
Nonstop5h 33m
Multiple Airlines
Deal found 24/1C$ 315
Sat 14/37:55 a.m.
SEA
-
YYZ
Nonstop4h 40m
Alaska Airlines
Tue 17/34:45 p.m.
YYZ
-
SEA
Nonstop5h 33m
Alaska Airlines
Deal found 25/1C$ 320
Mon 11/57:05 a.m.
SEA
-
YYZ
1 stop7h 17m
WestJet
Sat 16/58:00 a.m.
YYZ
-
SEA
1 stop8h 08m
WestJet
Deal found 24/1C$ 327
Sat 2/52:05 p.m.
SEA
-
YKF
1 stop7h 40m
WestJet
Sat 9/56:00 a.m.
YKF
-
SEA
1 stop10h 08m
WestJet
Deal found 24/1C$ 352
Tue 12/57:15 a.m.
SEA
-
YTZ
1 stop9h 37m
Air Canada
Sun 17/512:30 p.m.
YTZ
-
SEA
1 stop10h 07m
Air Canada
Deal found 24/1C$ 371
Sat 2/57:05 a.m.
SEA
-
YHM
1 stop7h 10m
WestJet
Sat 9/56:10 p.m.
YHM
-
SEA
1 stop21h 58m
WestJet
Deal found 24/1C$ 378
Sat 2/57:05 a.m.
SEA
-
YHM
1 stop7h 05m
WestJet
Sun 10/56:10 p.m.
YHM
-
SEA
1 stop21h 58m
WestJet
Deal found 23/1C$ 379
Sat 2/52:05 p.m.
SEA
-
YKF
1 stop7h 40m
WestJet
Sun 10/56:00 a.m.
YKF
-
SEA
1 stop10h 08m
WestJet
Deal found 23/1C$ 390

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 26 January 2026.

Round-trip from

C$ 301

One-way from

C$ 134

Popular in

June

Cheapest in

January

Average price

C$ 368

Good round-trip deal

C$ 321 or less

Good one-way deal

C$ 112 or less
Air Canada
  • Air Canada
  • 10/3-17/3
  • 1 total stop
  • 14h 44m total
  • Seattle to Toronto
Search Deals
WestJet
  • WestJet
  • 14/5
  • 1 total stop
  • 7h 10m total
  • Seattle to Toronto
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 134 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 26 January 2026.
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 14/3

3:40 p.m.-5:38 a.m.

2 stops10h 58m

Toronto Pearson Intl

Tue 17/3

8:00 a.m.-3:01 p.m.

1 stop10h 01m

C$ 311

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 2/5

2:05 p.m.-5:50 a.m.

2 stops12h 45m

Toronto Pearson Intl

Sat 9/5

8:00 a.m.-1:08 p.m.

1 stop8h 08m

C$ 337

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 17/2

11:59 p.m.-2:01 p.m.

1 stop11h 02m

Toronto Pearson Intl

Wed 18/2

4:10 p.m.-9:12 p.m.

1 stop8h 02m

C$ 347

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 2/5

2:05 p.m.-12:45 a.m.

1 stop7h 40m

Toronto Region of Waterloo Intl

Sat 9/5

6:00 a.m.-1:08 p.m.

1 stop10h 08m

C$ 352

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Tue 12/5

7:15 a.m.-7:52 p.m.

1 stop9h 37m

Toronto Island

Sun 17/5

12:30 p.m.-7:37 p.m.

1 stop10h 07m

C$ 371

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 27/2

8:00 a.m.-3:43 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Sun 1/3

7:50 p.m.-10:16 p.m.

Nonstop5h 26m

C$ 375

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 2/5

7:05 a.m.-5:15 p.m.

1 stop7h 10m

Hamilton

Sat 9/5

6:10 p.m.-1:08 p.m.

1 stop21h 58m

C$ 378

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 28/2

8:00 a.m.-3:43 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Sat 7/3

8:20 p.m.-8:31 a.m.

1 stop15h 11m

C$ 378

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 2/5

7:05 a.m.-5:10 p.m.

1 stop7h 05m

Hamilton

Sun 10/5

6:10 p.m.-1:08 p.m.

1 stop21h 58m

C$ 379

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 27/2

8:00 a.m.-3:43 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Mon 2/3

5:55 p.m.-10:57 p.m.

1 stop8h 02m

C$ 382

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/1

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 23 January 2026.

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, April is the cheapest month in which you can book a flight from Seattle to Toronto (average of C$ 171). Flying from Seattle to Toronto in December is currently the most expensive (average of C$ 385). 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 26 January 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 26 January 2026.

The most flights from SEA to YTO are scheduled on a Friday (10 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?

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 75% 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$ 389.

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 17m.

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 26 January 2026.
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
11,792 reviews
Check prices

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
8.0
Very good
11,792 reviews
Alaska Airlines
8.0
Very good
11,792 reviews
Check prices

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
WestJet
7.2
Good
3,249 reviews
Alaska Airlines
8.0
Very good
11,792 reviews
Check prices

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Air Canada
7.1
Good
10,656 reviews
Alaska Airlines
8.0
Very good
11,792 reviews
Check prices

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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 6 outbound flights to Toronto per day.

  • How long is the flight from Seattle to Toronto?

    For as low as C$ 311, Air Canada can have you in Toronto from Seattle in 10h 58m. 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$ 283), Alaska Airlines (C$ 303), and Air Canada (C$ 361) offers the cheapest pricing from Seattle to Toronto. You may be able to fly from Seattle to Toronto for 45% 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$ 136. Users have also found prices from C$ 137 and C$ 152 on Air Canada and Alaska 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: Air Canada (85%), United Airlines (85%), Alaska Airlines (83%).

  • What are the cheapest flights from Seattle to Toronto?

    On average you can expect to pay C$ 543 for a flight from Seattle to Toronto. The cheapest flight overall is C$ 112 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at C$ 318.

  • 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, April is the cheapest month in which you can book a flight from Seattle to Toronto (average of C$ 171). Flying from Seattle to Toronto in December is currently the most expensive (average of C$ 385). 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 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 26 January 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 283AverageC$ 387FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 303AverageC$ 777FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 361AverageC$ 523FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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