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Cheap flights from Toronto to Seattle from C$ 183

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 20/10. Fares are subject to change and may not be available on all flights or dates of travel.
YTO — SEA
25 Aug — 1 Sep1
1 adult

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 20 August 2025.

Round-trip from

C$ 313

One-way from

C$ 183

Popular in

December

Cheapest in

February

Average price

C$ 535

Good round-trip deal

C$ 419 or less

Good one-way deal

C$ 330 or less
WestJet
  • WestJet
  • 9/9-12/9
  • 3 total stops
  • 18h 37m total
  • Toronto to Seattle
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WestJet
  • WestJet
  • 20/10
  • 1 total stop
  • 9h 59m total
  • Toronto to Seattle
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High demand for flights, 5% potential price rise
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Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
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Average for round-trip flights in August 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 20 August 2025.

Tue 9/912:00 p.m.YYZ - SEA
2 stops10h 21mWestJet
Fri 12/91:15 p.m.SEA - YYZ
1 stop8h 16mWestJet
Deal found 17/8C$ 313
Wed 17/912:00 p.m.YYZ - SEA
2 stops11h 29mWestJet
Wed 24/98:40 a.m.SEA - YYZ
2 stops12h 51mWestJet
Deal found 18/8C$ 314
Wed 17/91:30 p.m.YYZ - SEA
1 stop9h 59mWestJet
Tue 23/97:05 a.m.SEA - YYZ
1 stop8h 47mWestJet
Deal found 19/8C$ 317
Wed 17/912:00 p.m.YYZ - SEA
2 stops11h 29mWestJet
Thu 25/98:40 a.m.SEA - YYZ
2 stops12h 51mWestJet
Deal found 18/8C$ 318
Fri 3/108:40 a.m.YYZ - SEA
Nonstop5h 19mMultiple Airlines
Fri 10/101:15 p.m.SEA - YYZ
1 stop8h 16mMultiple Airlines
Deal found 19/8C$ 322
Fri 3/106:45 a.m.YYZ - SEA
1 stop8h 48mWestJet
Wed 8/108:40 a.m.SEA - YYZ
1 stop7h 12mWestJet
Deal found 18/8C$ 324
Wed 15/104:45 p.m.YYZ - SEA
Nonstop5h 23mMultiple Airlines
Mon 20/102:05 p.m.SEA - YYZ
2 stops12h 46mMultiple Airlines
Deal found 19/8C$ 329
Tue 16/98:00 a.m.YYZ - SEA
1 stop7h 59mWestJet
Thu 18/97:05 a.m.SEA - YYZ
2 stops10h 56mWestJet
Deal found 18/8C$ 331
Fri 3/1012:25 p.m.YTZ - SEA
1 stop10h 06mAir Canada
Fri 10/107:15 a.m.SEA - YTZ
1 stop9h 34mAir Canada
Deal found 19/8C$ 347
Mon 20/106:00 a.m.YKF - SEA
1 stop9h 59mWestJet
Wed 22/101:50 p.m.SEA - YKF
1 stop7h 55mWestJet
Deal found 18/8C$ 353
Sat 25/106:00 a.m.YKF - SEA
1 stop9h 59mWestJet
Sun 2/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Deal found 18/8C$ 356
Wed 17/912:25 p.m.YTZ - SEA
1 stop10h 06mAir Canada
Tue 23/97:15 a.m.SEA - YTZ
1 stop9h 34mAir Canada
Deal found 20/8C$ 360

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 20 August 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

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 9/9

12:00 p.m.-7:21 p.m.

2 stops10h 21m

Seattle/Tacoma Intl

Fri 12/9

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

1 stop8h 16m

C$ 313

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 17/9

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

2 stops11h 29m

Seattle/Tacoma Intl

Wed 24/9

8:40 a.m.-12:31 a.m.

2 stops12h 51m

C$ 314

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 3/10

6:45 a.m.-12:33 p.m.

1 stop8h 48m

Seattle/Tacoma Intl

Wed 8/10

8:40 a.m.-6:52 p.m.

1 stop7h 12m

C$ 324

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 16/10

12:00 p.m.-7:14 p.m.

2 stops10h 14m

Seattle/Tacoma Intl

Tue 21/10

2:05 p.m.-5:51 a.m.

2 stops12h 46m

C$ 325

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 15/10

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

Nonstop5h 23m

Seattle/Tacoma Intl

Mon 20/10

2:05 p.m.-5:51 a.m.

2 stops12h 46m

C$ 329

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sat 11/10

12:00 p.m.-7:14 p.m.

2 stops10h 14m

Seattle/Tacoma Intl

Wed 15/10

1:50 p.m.-5:51 a.m.

2 stops13h 01m

C$ 332

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 16/9

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

Nonstop5h 23m

Seattle/Tacoma Intl

Tue 23/9

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

Nonstop4h 44m

C$ 335

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Fri 3/10

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

1 stop10h 06m

Seattle/Tacoma Intl

Fri 10/10

7:15 a.m.-7:49 p.m.

1 stop9h 34m

C$ 347

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Mon 20/10

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

1 stop9h 59m

Seattle/Tacoma Intl

Wed 22/10

1:50 p.m.-12:45 a.m.

1 stop7h 55m

C$ 353

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$ 356

Flights are sorted by cheapest round-trip flights first.

Deals found on 17/8

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 8 August 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 20 August 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 43% 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 20 August 2025.

The most flights from YTO to SEA are scheduled on a Tuesday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 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 73% 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$ 315.

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 32m.

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 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 20 August 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

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

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

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

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
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

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
8,928 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

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
3,032 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

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

Crew

8.5

Entertainment

7.0

Food

7.1

Comfort

7.8

Overall

8.0

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 3 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 and Air Canada can get you from Toronto to Seattle in just under 10h 06m. Your travel time can differ by up to 15m. Airlines will cover a distance of 3323 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$ 183), Alaska Airlines (C$ 328), and Air Canada (C$ 346) 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$ 183. Users have also found prices from C$ 210 and C$ 210 on Air Canada and United Airlines, 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 (92%), Hawaiian Airlines (92%) and Air Tahiti Nui (90%).

  • What are the cheapest flights from Toronto to Seattle?

    Looking at all options, your cheapest flight can be booked for C$ 209. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 322 on average our data indicates C$ 545 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
Renton
Olympia
Marysville
Lynnwood

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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 20 August 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 20 August 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 183AverageC$ 410FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 328AverageC$ 509FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 346AverageC$ 563FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 365AverageC$ 621FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapestC$ 373AverageC$ 497FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Hawaiian AirlinesCheapestC$ 411AverageC$ 464FlexibilityNo 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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