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Cheap flights from Toronto to Seattle from C$ 285

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 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
YTO — SEA
5 Sep — 12 Sep1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Toronto to Seattle/Tacoma Intl are usually found in February or November, booked 74 days in advance, depart on a Thursday or Friday and return on a Thursday

Cheap flight deals from Toronto to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Toronto to Seattle
Explore the most affordable flight options available from Toronto to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 August 2026.

Wed 16/91:30 p.m. -
1 stop8h 15m
Wed 30/910:30 a.m. -
2 stops8h 05m
Deal found 2/8C$ 479
Wed 23/912:40 p.m. -
2 stops9h 05m
Wed 30/910:30 a.m. -
2 stops8h 05m
Deal found 3/8C$ 483
Thu 24/91:30 p.m. -
1 stop8h 15m
Wed 30/97:35 p.m. -
1 stop7h 10m
Deal found 4/8C$ 486
Fri 11/912:40 p.m. -
2 stops9h 05m
Mon 21/97:35 p.m. -
1 stop7h 10m
Deal found 1/8C$ 487
Sat 19/912:40 p.m. -
2 stops9h 05m
Sun 4/107:35 p.m. -
1 stop8h 20m
Deal found 2/8C$ 489
Mon 31/812:00 p.m. -
1 stop9h 45m
Sun 6/97:35 p.m. -
1 stop7h 10m
Deal found 1/8C$ 492
Thu 1/101:30 p.m. -
1 stop8h 15m
Mon 5/107:35 p.m. -
1 stop8h 20m
Deal found 1/8C$ 493
Sun 20/93:30 p.m. -
2 stops21h 10m
Tue 29/910:30 a.m. -
2 stops8h 05m
Deal found 1/8C$ 494
Sat 26/912:40 p.m. -
2 stops9h 05m
Sat 3/107:35 p.m. -
1 stop8h 20m
Deal found 1/8C$ 497
Sat 29/86:10 p.m. -
1 stop18h 30m
Sat 5/97:00 a.m. -
1 stop7h 15m
Deal found 2/8C$ 532
Thu 27/86:10 p.m. -
1 stop18h 30m
Sun 30/87:00 a.m. -
1 stop7h 15m
Deal found 2/8C$ 545
Wed 26/86:10 p.m. -
1 stop29h 50m
Sun 6/97:00 a.m. -
1 stop7h 15m
Deal found 2/8C$ 546

Find flight deals from Toronto to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Toronto (YTO) to Seattle (SEA). 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 6 August 2026.

Round-trip from

C$ 479

One-way from

C$ 285

Popular in

June

Cheapest in

February

Average price

C$ 595

Good round-trip deal

C$ 618 or less

Good one-way deal

C$ 349 or less
WestJet
  • WestJet
  • 16/9-30/9
  • 3 total stops
  • 16h 20m total
  • Toronto to Seattle
Search Deals
Air Canada
  • Air Canada
  • 15/9
  • 2 total stops
  • 9h 37m total
  • Toronto to Seattle
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 122 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Toronto (YTO) to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Toronto (YTO) to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Toronto to Seattle 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 6 August 2026.
Use the filters below to find and compare flights from Toronto to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Mon 24/8

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

1 stop16h 00m

Seattle/Tacoma Intl

Sat 29/8

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

1 stop9h 50m

C$ 552

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Thu 1/10

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

1 stop16h 00m

Seattle/Tacoma Intl

Sun 4/10

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

1 stop21h 15m

C$ 552

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Sun 6/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Fri 11/9

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

1 stop21h 15m

C$ 552

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Fri 4/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Sun 6/9

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

1 stop9h 50m

C$ 567

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Fri 11/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Mon 21/9

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

1 stop21h 15m

C$ 574

HamiltonSeattle

YHM Hamilton - SEA Seattle/Tacoma Intl

YHMSEA

Hamilton

Wed 26/8

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

1 stop18h 30m

Seattle/Tacoma Intl

Mon 7/9

10:30 a.m.-5:15 p.m.

1 stop27h 45m

C$ 574

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Wed 7/10

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

1 stop25h 05m

Seattle/Tacoma Intl

Thu 22/10

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

1 stop21h 15m

C$ 583

TorontoSeattle

YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl

YYZSEA

Toronto Pearson Intl

Tue 20/10

12:10 p.m.-6:35 p.m.

1 stop9h 25m

Seattle/Tacoma Intl

Wed 21/10

11:10 p.m.-8:49 a.m.

1 stop6h 39m

C$ 586

TorontoSeattle

YYZ Toronto Pearson Intl - SEA Seattle/Tacoma Intl

YYZSEA

Toronto Pearson Intl

Tue 15/9

12:08 p.m.-6:45 p.m.

1 stop9h 37m

Seattle/Tacoma Intl

Tue 29/9

6:00 a.m.-5:20 p.m.

1 stop8h 20m

C$ 586

HamiltonSeattle

YHM Hamilton - SEA Seattle/Tacoma Intl

YHMSEA

Hamilton

Sun 13/9

6:10 p.m.-6:45 p.m.

1 stop27h 35m

Seattle/Tacoma Intl

Sat 19/9

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

1 stop18h 40m

C$ 588

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/8

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Toronto to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Toronto 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 Toronto to Seattle

What is the cheapest month to book a flight from Toronto to Seattle?

Currently, February is the cheapest month in which you can book a flight from Toronto to Seattle (average of C$ 338). Flying from Toronto to Seattle in June is currently the most expensive (average of C$ 650). 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 YTO to SEA?

Find hourly flight availability from Toronto to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 6 August 2026.

When flying from Toronto to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Airfare is typical for this route at the moment.
Toronto to Seattle flights typically cost between C$ 473 and C$ 808 in September.
The cheapest round-trip price found within the last 5 days was C$ 479 on WestJet (16 Sep-30 Sep).

What’s the top layover airport for flights from Toronto to Seattle?

Share of one-stop round-trip flights from Toronto to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

Calgary (YYC) – chosen by Cheapflights users on 68% of one-stop itineraries from Toronto to Seattle on Cheapflights.

What’s the cheapest layover airport for flights from Toronto to Seattle?

Average round-trip fare for 1-stop flights from Toronto to Seattle, 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$ 267.

What’s the fastest layover option from Toronto to Seattle?

Shortest average travel time for 1-stop one-way flights from Toronto to Seattle, 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 44m.

Which airport typically offers the quickest layover for flights from Toronto to Seattle?

Average layover duration for 1-stop one-way flights from Toronto to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 11m.

How often are flights from Toronto to Seattle delayed?

About 28% of weekly flights between Toronto and Seattle have experienced delays in the past year, with the average delay time being 155 minutes.

What is the most punctual flight time for Toronto to Seattle flights?

Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Monday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Toronto to Seattle flights?

Over the past year, Alaska Airlines has had the lowest number of delays on this route, with just 17% of flights being delayed.

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

Booking 85 days in advance of your planned departure date is, on average, the best time to get cheap flights from Toronto to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 6 August 2026.
Get a feel of what it's like to fly with Alaska Airlines,Delta, andUnited Airlines from Toronto to Seattle by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,774 reviews
Check prices

Food

7.0

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Alaska Airlines
7.9
Good
12,774 reviews
Alaska Airlines
7.9
Good
12,774 reviews
Check prices

Food

7.0

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Delta
7.8
Good
8,493 reviews
Alaska Airlines
7.9
Good
12,774 reviews
Check prices

Food

7.0

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
United Airlines
7.4
Good
10,075 reviews
Alaska Airlines
7.9
Good
12,774 reviews
Check prices

Food

7.0

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
WestJet
7.2
Good
3,426 reviews
Alaska Airlines
7.9
Good
12,774 reviews
Check prices

Food

7.0

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Air Canada
7.1
Good
11,432 reviews
Alaska Airlines
7.9
Good
12,774 reviews
Check prices

Food

7.0

Comfort

7.8

Entertainment

7.0

Boarding

8.1

Crew

8.5

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Related info for your journey

Find useful and relevant information for your journey from Toronto to Seattle. 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 into for flights to Seattle from Toronto?

    For a flight from Toronto to Seattle, you will be flying into Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 18.4 km from the centre of the city. Seattle/Tacoma Intl is the only Seattle airport and it handles 1 inbound flight from Toronto per day. 5 airlines have flights to Seattle/Tacoma Intl from Toronto on a regular basis.

  • How long is the flight from Toronto to Seattle?

    WestJet, Delta, and United Airlines can get you from Toronto to Seattle in just under 9h 25m. Your travel time can differ by up to 6h 35m. Airlines will cover a distance of 3306 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    According to our current data, Delta (C$ 227), Alaska Airlines (C$ 273), and WestJet (C$ 274) offers the cheapest pricing from Toronto to Seattle. These flights start at 56% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Toronto to Seattle one-way?

    For one-way options, check prices for Alaska Airlines. According to our data, you can fly for as low as C$ 172. Users have also found prices from C$ 193 and C$ 231 on WestJet and Air Canada, respectively.

  • What are the most popular routes from Toronto to Seattle?

    While some choose either Hamilton - Seattle/Tacoma Intl or Toronto Island - Seattle/Tacoma Intl, Toronto Pearson Intl - Seattle/Tacoma Intl is the most popular route from Toronto to Seattle.

  • What are the most reliable airlines from Toronto to Seattle?

    The top 3 most reliable airlines when flying from Toronto to Seattle are Alaska Airlines (90%), Qatar Airways (67%) and Air Canada (53%).

  • What are the cheapest flights from Toronto to Seattle?

    Looking at all options, your cheapest flight can be booked for C$ 306. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 525 on average, our data indicates C$ 697 when flying from Toronto to Seattle.

  • Can I find deals for flights from Toronto to Seattle that include hotel bookings?

    Yes. In addition to deals on Toronto to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Toronto to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Toronto to Seattle.

  • Can I find deals for business class flights from Toronto to Seattle?

    Yes. Cheapflights offers flight deals from Toronto to Seattle 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 Toronto to Seattle?

    Currently, February is the cheapest month in which you can book a flight from Toronto to Seattle (average of C$ 338). Flying from Toronto to Seattle in June is currently the most expensive (average of C$ 650). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Kent
Leavenworth
Mukilteo
Tacoma
Renton
Cashmere
Lynnwood
Ellensburg
Tukwila
Olympia
Marysville
Federal Way
Kirkland

Browse thousands of different options on Cheapflights for your next trip

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Fly from Toronto to Seattle on these airlines

Choose from the following airlines for your flight from Toronto to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 6 August 2026.
Air Canada flights from Toronto to Seattle/Tacoma Intl
WestJet flights from Toronto to Seattle/Tacoma Intl
United Airlines flights from Toronto to Seattle/Tacoma Intl

Top 5 airlines flying from Toronto to Seattle

Discover the top 5 airlines that operate flights from Toronto to Seattle. 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 6 August 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 227AverageC$ 564FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 273AverageC$ 426FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
WestJetCheapestC$ 274AverageC$ 443FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 288AverageC$ 614FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 376AverageC$ 753FlexibilityNo 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 Toronto to Seattle?

Deals for Toronto to Seattle 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 Toronto to Seattle?

Millions of users choose and trust Cheapflights to book the best flight deals from Toronto to Seattle 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 Toronto to Seattle with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Toronto to Seattle flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Toronto to Seattle become cheaper?

Yes, Cheapflights offers price alerts on Toronto to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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