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Cheap flights from Toronto to Seattle from C$ 203

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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
YTO — SEA
13 Dec — 20 Dec1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Toronto to Seattle/Tacoma Intl are usually found in February or January, booked 74 days in advance, depart on a Thursday or Wednesday and return on a Wednesday

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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 13 November 2025.

Tue 2/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Sat 6/1211:55 a.m.SEA - YYZ
2 stops8h 44mWestJet
Deal found 10/11C$ 301
Tue 2/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Sun 7/123:10 p.m.SEA - YYZ
2 stops11h 48mWestJet
Deal found 11/11C$ 303
Wed 10/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Sun 14/123:10 p.m.SEA - YYZ
2 stops11h 48mWestJet
Deal found 13/11C$ 305
Tue 9/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Tue 16/123:10 p.m.SEA - YYZ
2 stops12h 48mWestJet
Deal found 11/11C$ 307
Tue 2/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Thu 11/123:10 p.m.SEA - YYZ
2 stops12h 48mWestJet
Deal found 10/11C$ 308
Tue 2/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Wed 10/123:10 p.m.SEA - YYZ
2 stops11h 48mWestJet
Deal found 10/11C$ 317
Tue 2/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Mon 8/1211:55 a.m.SEA - YYZ
1 stop16h 03mWestJet
Deal found 10/11C$ 319
Wed 3/1210:15 p.m.YYZ - SEA
1 stop19h 05mWestJet
Sat 6/123:20 p.m.SEA - YYZ
2 stops11h 38mWestJet
Deal found 11/11C$ 329
Tue 2/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Fri 5/123:10 p.m.SEA - YYZ
2 stops11h 48mWestJet
Deal found 10/11C$ 332
Wed 3/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Tue 9/127:55 a.m.SEA - YYZ
Nonstop4h 40mAlaska Airlines
Deal found 10/11C$ 333
Thu 4/126:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Wed 10/123:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Deal found 11/11C$ 366
Mon 1/126:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Fri 5/123:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Deal found 13/11C$ 384

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 13 November 2025.

Round-trip from

C$ 296

One-way from

C$ 203

Popular in

December

Cheapest in

February

Average price

C$ 469

Good round-trip deal

C$ 393 or less

Good one-way deal

C$ 285 or less
WestJet
  • WestJet
  • 30/4-7/5
  • 4 total stops
  • 25h 23m total
  • Toronto to Seattle
Search Deals
WestJet
  • WestJet
  • 9/5
  • 1 total stop
  • 10h 08m total
  • Toronto to Seattle
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 1 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 November 2025
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 13 November 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

Mon 4/5

6:00 a.m.-8:28 p.m.

1 stop17h 28m

Seattle/Tacoma Intl

Tue 12/5

2:05 p.m.-12:40 a.m.

1 stop7h 35m

C$ 308

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Mon 20/4

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Sun 26/4

2:05 p.m.-12:40 a.m.

1 stop7h 35m

C$ 308

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 30/4

6:00 a.m.-1:08 p.m.

1 stop10h 08m

Seattle/Tacoma Intl

Thu 7/5

7:05 a.m.-12:45 a.m.

1 stop14h 40m

C$ 322

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Tue 17/3

6:20 a.m.-2:19 p.m.

1 stop10h 59m

Seattle/Tacoma Intl

Mon 23/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

C$ 339

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 5/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

Seattle/Tacoma Intl

Tue 9/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

C$ 345

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 4/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

Seattle/Tacoma Intl

Tue 9/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

C$ 347

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 22/4

6:10 p.m.-2:19 p.m.

1 stop23h 09m

Seattle/Tacoma Intl

Thu 7/5

7:05 a.m.-12:40 a.m.

1 stop14h 35m

C$ 347

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 30/4

6:00 a.m.-1:08 p.m.

1 stop10h 08m

Seattle/Tacoma Intl

Thu 7/5

7:05 a.m.-12:40 a.m.

1 stop14h 35m

C$ 347

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 4/12

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

1 stop11h 00m

Seattle/Tacoma Intl

Wed 10/12

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

1 stop11h 18m

C$ 366

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 17/2

5:50 a.m.-2:19 p.m.

1 stop11h 29m

Seattle/Tacoma Intl

Tue 24/2

3:10 p.m.-5:16 p.m.

1 stop23h 06m

C$ 367

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

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 7 November 2025.

Booking 74 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, May 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 June is currently the most expensive (average of C$ 349). 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 13 November 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 10% on your trip compared to booking a flight at noon.

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 Thursday mornings when fares are most often at their lowest. Monday evenings 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 13 November 2025.

The most flights from YTO to SEA are scheduled on a Thursday (7 on average). You will have fewer flight options on Friday, 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 71% 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$ 286.

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 13 November 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
11,281 reviews
Check prices

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

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
11,281 reviews
Alaska Airlines
8.0
Very good
11,281 reviews
Check prices

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

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
7.9
Good
8,007 reviews
Alaska Airlines
8.0
Very good
11,281 reviews
Check prices

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

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
9,015 reviews
Alaska Airlines
8.0
Very good
11,281 reviews
Check prices

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

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
3,159 reviews
Alaska Airlines
8.0
Very good
11,281 reviews
Check prices

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

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
10,444 reviews
Alaska Airlines
8.0
Very good
11,281 reviews
Check prices

Crew

8.5

Comfort

7.8

Entertainment

7.0

Food

7.1

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 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, Alaska Airlines, and Delta can get you from Toronto to Seattle in just under 5h 33m. Your travel time can differ by up to 11h 55m. 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, WestJet (C$ 185), Alaska Airlines (C$ 305), and Air Canada (C$ 345) offers the cheapest pricing from Toronto to Seattle. These flights start at 62% lower than the current average price 3 months from now.

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

    While some choose either Toronto Island - Seattle/Tacoma Intl or Hamilton - 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 Air Tahiti Nui (91%), Hawaiian Airlines (87%) and Alaska Airlines (75%).

  • What are the cheapest flights from Toronto to Seattle?

    Looking at all options, your cheapest flight can be booked for C$ 212. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 304 on average, our data indicates C$ 413 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, May 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 June is currently the most expensive (average of C$ 349). 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
Mukilteo
Bothell
Cashmere
Olympia
Renton
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 13 November 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 13 November 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 185AverageC$ 366FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 305AverageC$ 512FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 345AverageC$ 656FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 368AverageC$ 641FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapestC$ 380AverageC$ 501FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Hawaiian AirlinesCheapestC$ 417AverageC$ 470FlexibilityNo 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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