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Cheap flights from Toronto to Seattle from C$ 265

YTO — SEA
24 Sep — 1 Oct1
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 34 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

Thu 17/96:10 p.m. -
1 stop18h 30m
Sun 20/97:35 p.m. -
1 stop18h 40m
Deal found 21/8C$ 472
Fri 4/910:50 a.m. -
1 stop10h 55m
Sun 6/910:30 a.m. -
1 stop10h 40m
Deal found 23/8C$ 474
Wed 16/98:40 p.m. -
1 stop16h 00m
Wed 30/97:35 p.m. -
1 stop21h 15m
Deal found 25/8C$ 476
Sat 24/1012:40 p.m. -
2 stops9h 05m
Sun 1/112:30 p.m. -
2 stops12h 15m
Deal found 21/8C$ 476
Tue 8/98:40 p.m. -
1 stop25h 05m
Tue 15/97:35 p.m. -
1 stop21h 15m
Deal found 22/8C$ 477
Fri 18/911:10 p.m. -
2 stops13h 30m
Mon 28/97:35 p.m. -
1 stop7h 10m
Deal found 24/8C$ 477
Fri 11/96:10 p.m. -
1 stop27h 35m
Wed 16/97:35 p.m. -
1 stop18h 40m
Deal found 22/8C$ 478
Thu 3/912:00 p.m. -
2 stops12h 00m
Tue 22/97:35 p.m. -
2 stops9h 25m
Deal found 23/8C$ 478
Tue 22/98:40 p.m. -
1 stop16h 00m
Tue 29/97:35 p.m. -
1 stop21h 15m
Deal found 23/8C$ 480
Wed 9/96:10 p.m. -
1 stop18h 30m
Thu 17/97:35 p.m. -
1 stop18h 40m
Deal found 21/8C$ 480
Fri 18/911:10 p.m. -
2 stops13h 30m
Mon 21/97:35 p.m. -
1 stop7h 10m
Deal found 23/8C$ 480
Tue 15/96:10 p.m. -
1 stop27h 35m
Sat 19/97:35 p.m. -
1 stop18h 40m
Deal found 22/8C$ 481

Find flight deals from Toronto to Seattle

Round-trip from

C$ 472

One-way from

C$ 265

Popular in

June

Cheapest in

February

Average price

C$ 624

Good round-trip deal

C$ 652 or less

Good one-way deal

C$ 349 or less
WestJet
  • WestJet
  • 17/9-20/9
  • 2 total stops
  • 37h 10m total
  • Toronto to Seattle
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WestJet
  • WestJet
  • 22/9
  • 1 total stop
  • 18h 30m total
  • Toronto to Seattle
Search Deals
Highest demand for flights based on searches. 13% potential increase in price (C$ 110 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
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Average for round-trip flights in August 2026
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Price to beat on a round-trip flight from Toronto (YTO) to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Toronto (YTO) to Seattle/Tacoma Intl.
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Cheapflights Fare Finder

 
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

HamiltonSeattle

YHM Hamilton - SEA Seattle/Tacoma Intl

YHMSEA

Hamilton

Thu 17/9

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

1 stop18h 30m

Seattle/Tacoma Intl

Sun 20/9

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

1 stop18h 40m

C$ 472

TorontoSeattle

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

YKFSEA

Toronto Region of Waterloo Intl

Wed 16/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Wed 30/9

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

1 stop21h 15m

C$ 477

HamiltonSeattle

YHM Hamilton - SEA Seattle/Tacoma Intl

YHMSEA

Hamilton

Fri 11/9

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

1 stop18h 30m

Seattle/Tacoma Intl

Sat 12/9

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

1 stop18h 40m

C$ 478

HamiltonSeattle

YHM Hamilton - SEA Seattle/Tacoma Intl

YHMSEA

Hamilton

Tue 22/9

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

1 stop18h 30m

Seattle/Tacoma Intl

Tue 29/9

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

1 stop18h 40m

C$ 478

HamiltonSeattle

YHM Hamilton - SEA Seattle/Tacoma Intl

YHMSEA

Hamilton

Wed 16/9

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

1 stop27h 35m

Seattle/Tacoma Intl

Wed 30/9

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

1 stop18h 40m

C$ 478

HamiltonSeattle

YHM Hamilton - SEA Seattle/Tacoma Intl

YHMSEA

Hamilton

Fri 11/9

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

1 stop27h 35m

Seattle/Tacoma Intl

Wed 16/9

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

1 stop18h 40m

C$ 478

HamiltonSeattle

YHM Hamilton - SEA Seattle/Tacoma Intl

YHMSEA

Hamilton

Fri 18/9

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

1 stop27h 35m

Seattle/Tacoma Intl

Sun 27/9

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

1 stop27h 45m

C$ 489

TorontoSeattle

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

YKFSEA

Toronto Region of Waterloo Intl

Fri 25/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Tue 29/9

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

1 stop21h 15m

C$ 495

HamiltonSeattle

YHM Hamilton - SEA Seattle/Tacoma Intl

YHMSEA

Hamilton

Fri 18/9

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

1 stop27h 35m

Seattle/Tacoma Intl

Sun 20/9

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

1 stop18h 40m

C$ 514

TorontoSeattle

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

YKFSEA

Toronto Region of Waterloo Intl

Mon 28/9

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

1 stop25h 05m

Seattle/Tacoma Intl

Thu 15/10

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

1 stop21h 15m

C$ 532

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/8

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

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$ 332). Flying from Toronto to Seattle in August 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?

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$ 467 and C$ 716 in September.
The cheapest round-trip price found within the last 5 days was C$ 472 on WestJet (17 Sep-20 Sep).

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

Calgary (YYC) – chosen by Cheapflights users on 69% of one-stop itineraries from Toronto to Seattle on Cheapflights.

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

Edmonton (YEG) is the most affordable 1-stop option, with an average round-trip price of C$ 262.

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

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?

Flights via Philadelphia (PHL) offer the fastest connection on this route, with an average layover time of 0h 56m.

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 156 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 16% 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 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
12,839 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
12,839 reviews
Alaska Airlines
7.9
Good
12,839 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
8,529 reviews
Alaska Airlines
7.9
Good
12,839 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
10,123 reviews
Alaska Airlines
7.9
Good
12,839 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
3,437 reviews
Alaska Airlines
7.9
Good
12,839 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
11,537 reviews
Alaska Airlines
7.9
Good
12,839 reviews
Check prices

Food

7.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.0

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

  • 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 Alaska Airlines can get you from Toronto to Seattle in just under 5h 31m. Your travel time can differ by up to 12h 59m. 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$ 224), Alaska Airlines (C$ 268), and WestJet (C$ 270) 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$ 169. Users have also found prices from C$ 190 and C$ 227 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 (88%), Brussels Airlines (41%) and Air Canada (40%).

  • What are the cheapest flights from Toronto to Seattle?

    Looking at all options, your cheapest flight can be booked for C$ 301. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 503 on average, our data indicates C$ 611 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$ 332). Flying from Toronto to Seattle in August 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

Fly from Toronto to Seattle on these airlines

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

AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 224AverageC$ 540FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 268AverageC$ 417FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
WestJetCheapestC$ 270AverageC$ 453FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 294AverageC$ 624FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 370AverageC$ 733FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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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