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Cheap flights from Seattle to Toronto from C$ 161

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 26/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
3 Aug — 10 Aug1
1 adult

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Toronto are usually found in January or February, booked 89 days in advance, depart on a Wednesday or Thursday 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 29 July 2025.

Round-trip from

C$ 333

One-way from

C$ 161

Popular in

June

Cheapest in

January

Average price

C$ 672

Good round-trip deal

C$ 910 or less

Good one-way deal

C$ 235 or less
WestJet
  • WestJet
  • 12/9-19/9
  • 3 total stops
  • 19h 45m total
  • Seattle to Toronto
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WestJet
  • WestJet
  • 26/8
  • 1 total stop
  • 7h 37m total
  • Seattle to Toronto
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Highest demand for flights based on searches. 13% potential increase in price (C$ 120 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 16 potential savings vs. average RT price).
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Average for round-trip flights in July 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 29 July 2025.

Fri 12/91:15 p.m.SEA - YYZ
1 stop8h 16mWestJet
Fri 19/912:00 p.m.YYZ - SEA
2 stops11h 29mWestJet
Deal found 29/7C$ 333
Thu 11/95:30 a.m.SEA - YTZ
2 stops10h 15mAir Canada
Thu 18/94:10 p.m.YTZ - SEA
2 stops9h 06mAir Canada
Deal found 28/7C$ 342
Wed 12/118:15 a.m.SEA - YYZ
Nonstop4h 43mAir Canada
Wed 26/117:30 p.m.YYZ - SEA
Nonstop5h 26mAir Canada
Deal found 29/7C$ 351
Tue 19/82:05 p.m.SEA - YKF
1 stop7h 41mWestJet
Fri 22/86:00 a.m.YKF - SEA
1 stop9h 58mWestJet
Deal found 26/7C$ 380
Fri 12/97:16 a.m.SEA - YYZ
Nonstop4h 44mMultiple Airlines
Fri 19/93:00 p.m.YYZ - SEA
1 stop8h 29mMultiple Airlines
Deal found 29/7C$ 402
Tue 9/97:16 a.m.SEA - YYZ
Nonstop4h 44mAlaska Airlines
Sat 20/94:45 p.m.YYZ - SEA
Nonstop5h 23mAlaska Airlines
Deal found 28/7C$ 405
Tue 19/82:05 p.m.SEA - YHM
1 stop7h 36mWestJet
Fri 22/86:00 a.m.YHM - SEA
1 stop9h 58mWestJet
Deal found 26/7C$ 406
Wed 10/97:15 p.m.SEA - YKF
3 stops31h 15mMultiple Airlines
Wed 17/96:30 a.m.YKF - SEA
2 stops18h 46mMultiple Airlines
Deal found 27/7C$ 420
Thu 11/95:30 a.m.SEA - YTZ
2 stops12h 11mMultiple Airlines
Thu 18/95:30 p.m.YTZ - SEA
3 stops18h 52mMultiple Airlines
Deal found 28/7C$ 471
Fri 12/91:15 p.m.SEA - YHM
1 stop7h 33mMultiple Airlines
Fri 19/92:55 p.m.YHM - SEA
2 stops10h 21mMultiple Airlines
Deal found 29/7C$ 492

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 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

Fri 12/9

1:15 p.m.-12:31 a.m.

1 stop8h 16m

Toronto Pearson Intl

Fri 19/9

12:00 p.m.-8:29 p.m.

2 stops11h 29m

C$ 333

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Thu 11/9

5:30 a.m.-6:45 p.m.

2 stops10h 15m

Toronto Island

Thu 18/9

4:10 p.m.-10:16 p.m.

2 stops9h 06m

C$ 342

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 12/11

8:15 a.m.-3:58 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Wed 26/11

7:30 p.m.-9:56 p.m.

Nonstop5h 26m

C$ 351

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 10/9

7:16 a.m.-3:00 p.m.

Nonstop4h 44m

Toronto Pearson Intl

Wed 17/9

8:40 a.m.-10:59 a.m.

Nonstop5h 19m

C$ 362

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 19/8

2:05 p.m.-12:46 a.m.

1 stop7h 41m

Toronto Region of Waterloo Intl

Fri 22/8

6:00 a.m.-12:58 p.m.

1 stop9h 58m

C$ 380

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/9

7:16 a.m.-3:00 p.m.

Nonstop4h 44m

Toronto Pearson Intl

Sat 20/9

4:45 p.m.-7:08 p.m.

Nonstop5h 23m

C$ 405

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 19/8

2:05 p.m.-12:41 a.m.

1 stop7h 36m

Hamilton

Fri 22/8

6:00 a.m.-12:58 p.m.

1 stop9h 58m

C$ 406

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 10/9

7:15 p.m.-5:30 a.m.

3 stops31h 15m

Toronto Region of Waterloo Intl

Wed 17/9

6:30 a.m.-10:16 p.m.

2 stops18h 46m

C$ 420

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Thu 11/9

5:30 a.m.-8:41 p.m.

2 stops12h 11m

Toronto Island

Thu 18/9

5:30 p.m.-9:22 a.m.

3 stops18h 52m

C$ 471

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 12/9

1:15 p.m.-11:48 p.m.

1 stop7h 33m

Hamilton

Fri 19/9

2:55 p.m.-10:16 p.m.

2 stops10h 21m

C$ 492

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/7

Showing 1-10 of 23 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 25 July 2025.

Booking 87 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$ 167). 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 29 July 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 73% 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 29 July 2025.

The most flights from SEA to YTO are scheduled on a Thursday (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 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 80% 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.

Edmonton (YEG) is the most affordable 1-stop option, with an average round-trip price of C$ 421.

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: 3h 06m.

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 29 July 2025.
See what other customers who have flown with Alaska Airlines,Delta, andUnited Airlines 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

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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.
Delta
8.0
Very good
7,979 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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
2,972 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

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. 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.

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

    According to our current data, WestJet (C$ 333), Air Canada (C$ 342), and Alaska Airlines (C$ 405) offers the cheapest pricing from Seattle to Toronto. You may be able to fly from Seattle to Toronto for 41% 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$ 161. Users have also found prices from C$ 162 and C$ 167 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 - Hamilton or Seattle/Tacoma Intl - Toronto Island 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 (92%), Hawaiian Airlines (92%).

  • What are the cheapest flights from Seattle to Toronto?

    On average you can expect to pay C$ 706 for a flight from Seattle to Toronto. The cheapest flight overall is C$ 175 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, January is the cheapest month in which you can book a flight from Seattle to Toronto (average of C$ 167). 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 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 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 189AverageC$ 574FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 295AverageC$ 478FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 418AverageC$ 721FlexibilityNo 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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