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Cheap flights from Toronto to Seattle from C$ 254

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
25 Jul — 1 Aug1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Toronto to Seattle/Tacoma Intl are usually found in February or March, booked 56 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 25 June 2026.

Wed 21/1012:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Mon 26/103:10 p.m.
SEA
-
YYZ
2 stops11h 48m
WestJet
Deal found 25/6C$ 411
Fri 20/116:30 a.m.
YYZ
-
SEA
1 stop9h 50m
WestJet
Mon 23/113:10 p.m.
SEA
-
YYZ
2 stops10h 48m
WestJet
Deal found 21/6C$ 422
Wed 21/101:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Sat 24/1010:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Deal found 25/6C$ 429
Fri 11/912:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Mon 21/97:35 p.m.
SEA
-
YYZ
1 stop8h 20m
WestJet
Deal found 24/6C$ 431
Tue 8/91:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Tue 15/910:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Deal found 22/6C$ 432
Fri 25/91:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Sat 3/107:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 23/6C$ 434
Wed 9/912:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Thu 24/910:30 a.m.
SEA
-
YYZ
1 stop9h 15m
WestJet
Deal found 22/6C$ 435
Fri 18/91:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Sun 20/97:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 21/6C$ 438
Wed 30/912:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Mon 5/107:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 20/6C$ 441
Wed 7/1012:00 p.m.
YYZ
-
SEA
1 stop9h 45m
WestJet
Wed 21/107:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 23/6C$ 446
Sun 6/91:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Mon 28/910:30 a.m.
SEA
-
YYZ
1 stop7h 45m
WestJet
Deal found 21/6C$ 448
Mon 27/76:10 p.m.
YHM
-
SEA
1 stop18h 30m
WestJet
Sat 5/97:00 a.m.
SEA
-
YHM
1 stop7h 15m
WestJet
Deal found 20/6C$ 508

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 25 June 2026.

Round-trip from

C$ 411

One-way from

C$ 254

Popular in

June

Cheapest in

February

Average price

C$ 712

Good round-trip deal

C$ 730 or less

Good one-way deal

C$ 416 or less
WestJet
  • WestJet
  • 21/10-26/10
  • 3 total stops
  • 21h 33m total
  • Toronto to Seattle
Search Deals
WestJet
  • WestJet
  • 15/9
  • 1 total stop
  • 8h 15m total
  • Toronto to Seattle
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 121 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 25 June 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

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 2/9

6:10 p.m.-9:00 p.m.

1 stop29h 50m

Seattle/Tacoma Intl

Tue 8/9

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

1 stop7h 15m

C$ 510

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Mon 6/7

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

1 stop18h 30m

Seattle/Tacoma Intl

Fri 10/7

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

1 stop7h 15m

C$ 520

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 10/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Sun 13/9

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

1 stop21h 15m

C$ 523

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Wed 2/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Tue 8/9

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

1 stop9h 50m

C$ 526

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 20/8

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

1 stop18h 30m

Seattle/Tacoma Intl

Tue 25/8

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

1 stop7h 15m

C$ 529

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 7/7

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

1 stop18h 30m

Seattle/Tacoma Intl

Sat 18/7

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

1 stop7h 15m

C$ 532

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 9/7

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

1 stop18h 30m

Seattle/Tacoma Intl

Sun 19/7

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

1 stop7h 15m

C$ 532

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Wed 15/7

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

1 stop25h 05m

Seattle/Tacoma Intl

Thu 23/7

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

1 stop9h 50m

C$ 536

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Tue 4/8

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

1 stop16h 00m

Seattle/Tacoma Intl

Sat 15/8

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

1 stop9h 50m

C$ 536

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Mon 6/7

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

1 stop16h 00m

Seattle/Tacoma Intl

Fri 10/7

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

1 stop21h 15m

C$ 537

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/6

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, December is the cheapest month in which you can book a flight from Toronto to Seattle (average of C$ 129). Flying from Toronto to Seattle in August is currently the most expensive (average of C$ 661). 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 25 June 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.

Weekly flight availability from Toronto to Seattle

Explore weekly flight availability from Toronto to Seattle. 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 25 June 2026.

The most flights from YTO to SEA are scheduled on a Thursday (4 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 on average).

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

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 67% 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$ 321.

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 46m.

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 Denver (DEN) offer the fastest connection on this route, with an average layover time of 1h 01m.

How often are flights from Toronto to Seattle delayed?

About 27% 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?

Wednesday 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 25 June 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
12,573 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

7.9

Food

7.0

Boarding

8.1

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
12,573 reviews
Alaska Airlines
7.9
Good
12,573 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

7.9

Food

7.0

Boarding

8.1

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
8,440 reviews
Alaska Airlines
7.9
Good
12,573 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

7.9

Food

7.0

Boarding

8.1

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
9,889 reviews
Alaska Airlines
7.9
Good
12,573 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

7.9

Food

7.0

Boarding

8.1

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
3,384 reviews
Alaska Airlines
7.9
Good
12,573 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

7.9

Food

7.0

Boarding

8.1

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
11,257 reviews
Alaska Airlines
7.9
Good
12,573 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Overall

7.9

Food

7.0

Boarding

8.1

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 2 inbound flights 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, United Airlines, and Delta can get you from Toronto to Seattle in just under 13h 34m. Your travel time can differ by up to 16h 16m. 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$ 230), Alaska Airlines (C$ 277), and WestJet (C$ 279) offers the cheapest pricing from Toronto to Seattle. These flights start at 54% 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$ 174. Users have also found prices from C$ 183 and C$ 215 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 Region of Waterloo Intl - 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 Hawaiian Airlines (100%), Alaska Airlines (95%) and Qatar Airways (67%).

  • What are the cheapest flights from Toronto to Seattle?

    Looking at all options, your cheapest flight can be booked for C$ 340. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 502 on average, our data indicates C$ 785 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, December is the cheapest month in which you can book a flight from Toronto to Seattle (average of C$ 129). Flying from Toronto to Seattle in August is currently the most expensive (average of C$ 661). 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
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 25 June 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 25 June 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 230AverageC$ 518FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 277AverageC$ 437FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
WestJetCheapestC$ 279AverageC$ 387FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 286AverageC$ 602FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 380AverageC$ 771FlexibilityNo 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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