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Cheap flights from Toronto to Seattle from C$ 173

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 22/10. Fares are subject to change and may not be available on all flights or dates of travel.
YTO — SEA
17 Oct — 24 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Toronto to Seattle/Tacoma Intl are usually found in February or January, booked 75 days in advance, depart on a Thursday or Wednesday and return on a Wednesday

Cheap 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 17 September 2025.

Round-trip from

C$ 281

One-way from

C$ 173

Popular in

December

Cheapest in

February

Average price

C$ 545

Good round-trip deal

C$ 492 or less

Good one-way deal

C$ 429 or less
WestJet
  • WestJet
  • 15/10-22/10
  • 2 total stops
  • 17h 49m total
  • Toronto to Seattle
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WestJet
  • WestJet
  • 22/10
  • 1 total stop
  • 9h 59m total
  • Toronto to Seattle
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High demand for flights, 7% potential price rise
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Cheapest flight prices on average. 1% potential price decrease (C$ 10 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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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Find flight deals from Toronto to Seattle

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 17 September 2025.

Wed 15/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Wed 22/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Deal found 15/9C$ 281
Mon 20/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Fri 24/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Deal found 15/9C$ 283
Fri 24/109:00 a.m.YYZ - SEA
2 stops13h 21mWestJet
Sat 1/113:20 p.m.SEA - YYZ
2 stops11h 38mWestJet
Deal found 17/9C$ 289
Sat 25/108:00 a.m.YYZ - SEA
1 stop7h 59mWestJet
Sat 1/113:20 p.m.SEA - YYZ
2 stops11h 38mWestJet
Deal found 17/9C$ 290
Fri 3/106:45 a.m.YYZ - SEA
1 stop8h 50mWestJet
Sat 11/101:50 p.m.SEA - YYZ
1 stop7h 32mWestJet
Deal found 16/9C$ 293
Wed 10/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Fri 27/23:10 p.m.SEA - YYZ
1 stop20h 48mWestJet
Deal found 16/9C$ 294
Wed 10/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Wed 25/28:00 a.m.SEA - YYZ
Nonstop4h 35mAlaska Airlines
Deal found 16/9C$ 299
Sat 25/106:00 a.m.YKF - SEA
1 stop9h 59mWestJet
Sun 2/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Deal found 16/9C$ 300
Sun 5/106:45 a.m.YYZ - SEA
1 stop8h 50mWestJet
Tue 7/107:05 a.m.SEA - YYZ
1 stop7h 17mWestJet
Deal found 16/9C$ 300
Sat 13/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Wed 25/28:00 a.m.SEA - YYZ
Nonstop4h 35mAlaska Airlines
Deal found 17/9C$ 301
Fri 3/106:45 a.m.YYZ - SEA
1 stop8h 50mWestJet
Wed 8/108:40 a.m.SEA - YYZ
1 stop12h 42mWestJet
Deal found 16/9C$ 303
Wed 22/106:30 a.m.YYZ - SEA
1 stop9h 29mWestJet
Thu 30/103:10 p.m.SEA - YYZ
2 stops18h 13mWestJet
Deal found 16/9C$ 307

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 17 September 2025.
Use the filters below to find and compare flights from Toronto to Seattle that are best for you.

Fly from

Toronto

Fly to

Seattle

Route

Depart

Return

Price

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 15/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Wed 22/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

C$ 281

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sat 25/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Sun 2/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

C$ 300

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 15/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Thu 23/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

C$ 315

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 27/11

6:20 a.m.-2:20 p.m.

1 stop11h 00m

Seattle/Tacoma Intl

Sun 30/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

C$ 316

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 22/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Sat 25/10

8:40 a.m.-5:17 p.m.

1 stop29h 37m

C$ 330

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 7/10

7:00 a.m.-5:53 p.m.

3 stops13h 53m

Seattle/Tacoma Intl

Tue 7/10

10:35 p.m.-9:58 a.m.

1 stop8h 23m

C$ 333

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sat 1/11

6:50 a.m.-9:13 p.m.

2 stops17h 23m

Seattle/Tacoma Intl

Sat 1/11

11:50 p.m.-11:48 a.m.

1 stop9h 58m

C$ 337

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 8/10

7:30 a.m.-10:17 p.m.

1 stop17h 47m

Seattle/Tacoma Intl

Mon 20/10

2:55 p.m.-1:06 a.m.

1 stop7h 11m

C$ 338

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Tue 7/10

12:25 p.m.-7:31 p.m.

1 stop10h 06m

Seattle/Tacoma Intl

Wed 8/10

7:15 a.m.-9:34 p.m.

1 stop11h 19m

C$ 341

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sat 25/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Sun 2/11

3:10 p.m.-5:17 p.m.

1 stop23h 07m

C$ 343

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/9

Showing 1-10 of 60 results
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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

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

Use this chart to determine the optimal time to book a round-trip flight from Toronto to Seattle. Price data was last updated on 12 September 2025.

Booking 75 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.

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

Currently, January is the cheapest month in which you can book a flight from Toronto to Seattle (average of C$ 262). Flying from Toronto to Seattle in December is currently the most expensive (average of C$ 353). 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 17 September 2025.

A simple way to save on the total cost of your ticket is to fly from Toronto to Seattle in the evening. If you’re flexible enough to do this you can expect to save up to 48% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Toronto to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Toronto to Seattle. Price data was last updated on 16 December 2024.

Travelers seeking maximum savings on their Toronto to Seattle flight should consider departing on Tuesday at noon when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 17 September 2025.

The most flights from YTO to SEA are scheduled on a Tuesday (6 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).

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 69% 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.

Calgary (YYC) is the most affordable 1-stop option, with an average round-trip price of C$ 281.

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 Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 7h 50m.

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.

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 17 September 2025.
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
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Delta
8.0
Very good
7,961 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
United Airlines
7.4
Good
8,926 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
WestJet
7.2
Good
3,095 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Air Canada
7.1
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

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 4 inbound flights from Toronto per day. 6 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 Air Canada can get you from Toronto to Seattle in just under 9h 59m. Your travel time can differ by up to 3h 54m. Airlines will cover a distance of 3304 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, WestJet (C$ 182), Alaska Airlines (C$ 321), and Air Canada (C$ 342) offers the cheapest pricing from Toronto to Seattle. These flights start at 63% 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 WestJet. According to our data, you can fly for as low as C$ 173. Users have also found prices from C$ 210 and C$ 289 on United Airlines 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 (93%), Hawaiian Airlines (93%) and Air Tahiti Nui (89%).

  • What are the cheapest flights from Toronto to Seattle?

    Looking at all options, your cheapest flight can be booked for C$ 250. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 289 on average, our data indicates C$ 730 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, January is the cheapest month in which you can book a flight from Toronto to Seattle (average of C$ 262). Flying from Toronto to Seattle in December is currently the most expensive (average of C$ 353). 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
Leavenworth
SeaTac
Tukwila
Tacoma
Bothell
Cashmere
Renton
Olympia
Marysville
Lynnwood

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 17 September 2025.
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 6 airlines flying from Toronto to Seattle

Discover the top 6 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 17 September 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 182AverageC$ 401FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 321AverageC$ 515FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 342AverageC$ 560FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 367AverageC$ 640FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapestC$ 376AverageC$ 499FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Hawaiian AirlinesCheapestC$ 409AverageC$ 462FlexibilityNo cancel feeOn-time85%
Search Hawaiian 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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