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Cheap flights from Seattle to Toronto from C$ 150

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
28 May — 4 Jun1
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 Friday

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 28 April 2026.

Fri 7/810:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Fri 14/812:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Deal found 23/4C$ 361
Sun 12/77:35 p.m.
SEA
-
YYZ
1 stop15h 40m
WestJet
Tue 21/71:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Deal found 23/4C$ 365
Tue 1/97:00 a.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Sun 6/93:50 p.m.
YYZ
-
SEA
1 stop8h 10m
WestJet
Deal found 23/4C$ 367
Tue 23/610:30 a.m.
SEA
-
YYZ
1 stop10h 40m
WestJet
Thu 23/73:50 p.m.
YYZ
-
SEA
1 stop8h 10m
WestJet
Deal found 23/4C$ 369
Fri 7/87:00 a.m.
SEA
-
YYZ
2 stops11h 10m
WestJet
Wed 12/812:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Deal found 23/4C$ 371
Fri 31/77:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Sun 9/810:50 a.m.
YYZ
-
SEA
1 stop10h 55m
WestJet
Deal found 23/4C$ 372
Fri 9/107:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Tue 13/1012:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Deal found 23/4C$ 374
Fri 15/510:30 a.m.
SEA
-
YYZ
1 stop7h 45m
WestJet
Sun 17/56:10 a.m.
YYZ
-
SEA
2 stops15h 35m
WestJet
Deal found 25/4C$ 375
Mon 11/57:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Sat 16/510:25 p.m.
YYZ
-
SEA
1 stop14h 15m
WestJet
Deal found 26/4C$ 376
Sat 23/510:30 a.m.
SEA
-
YYZ
1 stop10h 40m
WestJet
Thu 16/71:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Deal found 24/4C$ 378
Thu 21/510:30 a.m.
SEA
-
YYZ
1 stop11h 35m
WestJet
Wed 15/71:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Deal found 24/4C$ 379
Tue 12/510:30 a.m.
SEA
-
YYZ
2 stops10h 29m
WestJet
Sat 16/510:25 p.m.
YYZ
-
SEA
1 stop14h 15m
WestJet
Deal found 23/4C$ 380

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 28 April 2026.

Round-trip from

C$ 361

One-way from

C$ 150

Popular in

June

Cheapest in

January

Average price

C$ 517

Good round-trip deal

C$ 255 or less

Good one-way deal

C$ 308 or less
WestJet
  • WestJet
  • 7/8-14/8
  • 2 total stops
  • 19h 00m total
  • Seattle to Toronto
Search Deals
WestJet
  • WestJet
  • 14/5
  • 1 total stop
  • 8h 20m total
  • Seattle to Toronto
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (C$ 149 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 28 April 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

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 18/6

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

1 stop9h 50m

Toronto Region of Waterloo Intl

Tue 23/6

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

1 stop16h 00m

C$ 439

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 18/6

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

1 stop9h 50m

Toronto Region of Waterloo Intl

Mon 29/6

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

1 stop16h 00m

C$ 444

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 3/6

7:05 a.m.-10:44 p.m.

1 stop12h 39m

Toronto Pearson Intl

Thu 4/6

2:45 p.m.-10:39 p.m.

1 stop10h 54m

C$ 458

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 24/5

11:05 p.m.-1:30 p.m.

1 stop11h 25m

Toronto Pearson Intl

Thu 28/5

12:09 p.m.-8:41 p.m.

1 stop11h 32m

C$ 458

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 4/6

11:05 p.m.-1:30 p.m.

1 stop11h 25m

Toronto Pearson Intl

Sun 7/6

1:40 p.m.-11:59 p.m.

1 stop13h 19m

C$ 458

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 7/6

11:52 p.m.-9:54 a.m.

1 stop7h 02m

Toronto Pearson Intl

Tue 9/6

5:15 p.m.-11:59 p.m.

1 stop9h 44m

C$ 458

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 23/5

11:05 p.m.-1:30 p.m.

1 stop11h 25m

Toronto Pearson Intl

Mon 1/6

5:45 p.m.-12:10 a.m.

1 stop9h 25m

C$ 458

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 25/5

11:05 p.m.-1:30 p.m.

1 stop11h 25m

Toronto Pearson Intl

Thu 28/5

2:20 p.m.-10:48 p.m.

1 stop11h 28m

C$ 458

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 27/5

11:05 p.m.-8:59 a.m.

1 stop6h 54m

Toronto Pearson Intl

Mon 1/6

6:10 a.m.-11:05 a.m.

1 stop7h 55m

C$ 458

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Wed 24/6

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

1 stop7h 15m

Hamilton

Sun 28/6

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

1 stop18h 30m

C$ 465

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/4

Showing 1-10 of 60 resultsSorted by cheapest first
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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?

Booking 66 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, November is the cheapest month in which you can book a flight from Seattle to Toronto (average of C$ 120). Flying from Seattle to Toronto in June is currently the most expensive (average of C$ 225). 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 28 April 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 28 April 2026.

The most flights from SEA to YTO are scheduled on a Monday (5 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 on average).

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

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 28 April 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
7.9
Good
12,307 reviews
Check prices

Food

7.0

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.8

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
7.9
Good
12,307 reviews
Alaska Airlines
7.9
Good
12,307 reviews
Check prices

Food

7.0

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.8

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
3,327 reviews
Alaska Airlines
7.9
Good
12,307 reviews
Check prices

Food

7.0

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.8

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
10,974 reviews
Alaska Airlines
7.9
Good
12,307 reviews
Check prices

Food

7.0

Entertainment

7.0

Crew

8.5

Boarding

8.1

Overall

7.9

Comfort

7.8

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 4 outbound flights to Toronto per day.

  • How long is the flight from Seattle to Toronto?

    For as low as C$ 439, WestJet can have you in Toronto from Seattle in 9h 50m. Airlines will cover a distance of 3257 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$ 255), WestJet (C$ 281), and Alaska Airlines (C$ 301) offers the cheapest pricing from Seattle to Toronto. You may be able to fly from Seattle to Toronto for 50% 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$ 126. Users have also found prices from C$ 130 and C$ 140 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 Tahiti Nui (100%), Alaska Airlines (92%), Hawaiian Airlines (92%).

  • What are the cheapest flights from Seattle to Toronto?

    On average you can expect to pay C$ 417 for a flight from Seattle to Toronto. The cheapest flight overall is C$ 135 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at C$ 378.

  • 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, November is the cheapest month in which you can book a flight from Seattle to Toronto (average of C$ 120). Flying from Seattle to Toronto in June is currently the most expensive (average of C$ 225). 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 28 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 255AverageC$ 451FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 281AverageC$ 432FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 301AverageC$ 761FlexibilityNo cancel feeOn-time75%
Search Alaska 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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