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Cheap flights from Toronto to Seattle from C$ 170

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 21/9. Fares are subject to change and may not be available on all flights or dates of travel.
YTO — SEA
8 Jul — 15 Jul1
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 Thursday

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 3 July 2025.

Round-trip from

C$ 309

One-way from

C$ 170

Popular in

July

Cheapest in

February

Average price

C$ 587

Good round-trip deal

C$ 576 or less

Good one-way deal

C$ 267 or less
WestJet
  • WestJet
  • 22/8-26/8
  • 2 total stops
  • 17h 34m total
  • Toronto to Seattle
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WestJet
  • WestJet
  • 21/9
  • 1 total stop
  • 9h 59m total
  • Toronto to Seattle
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Highest demand for flights based on searches. 10% potential increase in price (C$ 81 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
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Average for round-trip flights in July 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 3 July 2025.

Wed 15/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Thu 23/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Deal found 1/7C$ 278
Fri 15/86:00 a.m.YKF - SEA
1 stop17h 28mWestJet
Fri 22/81:50 p.m.SEA - YKF
1 stop7h 56mWestJet
Deal found 1/7C$ 349
Thu 17/76:45 a.m.YYZ - SEA
1 stop8h 50mWestJet
Thu 24/77:35 p.m.SEA - YYZ
1 stop8h 17mWestJet
Deal found 3/7C$ 349
Tue 8/74:10 p.m.YTZ - SEA
2 stops9h 06mAir Canada
Tue 15/75:30 a.m.SEA - YTZ
2 stops12h 11mAir Canada
Deal found 1/7C$ 352
Mon 6/1010:00 a.m.YYZ - SEA
2 stops12h 31mAir Canada
Mon 13/107:15 a.m.SEA - YYZ
1 stop8h 19mAir Canada
Deal found 1/7C$ 365
Tue 14/104:45 p.m.YYZ - SEA
Nonstop5h 19mAlaska Airlines
Sat 25/107:18 a.m.SEA - YYZ
Nonstop4h 42mAlaska Airlines
Deal found 2/7C$ 371
Fri 11/712:45 p.m.YYZ - SEA
1 stop11h 03mUnited Airlines
Mon 21/75:26 p.m.SEA - YYZ
1 stop13h 32mUnited Airlines
Deal found 1/7C$ 375
Thu 4/126:15 a.m.YYZ - SEA
2 stops11h 28mAmerican Airlines
Sat 10/111:54 a.m.SEA - YYZ
1 stop8h 06mAmerican Airlines
Deal found 1/7C$ 383
Fri 10/106:00 a.m.YYZ - SEA
1 stop11h 24mDelta
Sun 12/105:45 a.m.SEA - YYZ
1 stop8h 01mDelta
Deal found 1/7C$ 390
Wed 17/91:30 p.m.YYZ - SEA
1 stop9h 59mMultiple Airlines
Wed 24/97:16 a.m.SEA - YYZ
Nonstop4h 44mMultiple Airlines
Deal found 1/7C$ 413
Thu 9/106:00 a.m.YKF - SEA
1 stop9h 59mMultiple Airlines
Mon 13/103:39 p.m.SEA - YKF
2 stops10h 36mMultiple Airlines
Deal found 1/7C$ 439
Sat 16/87:20 p.m.YTZ - SEA
2 stops17h 01mMultiple Airlines
Sat 23/82:55 p.m.SEA - YTZ
3 stops24h 12mMultiple Airlines
Deal found 2/7C$ 542

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 3 July 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

Thu 23/10

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

1 stop7h 50m

C$ 278

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Fri 15/8

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

1 stop17h 28m

Seattle/Tacoma Intl

Fri 22/8

1:50 p.m.-12:46 a.m.

1 stop7h 56m

C$ 349

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 17/7

6:45 a.m.-12:35 p.m.

1 stop8h 50m

Seattle/Tacoma Intl

Thu 24/7

7:35 p.m.-6:52 a.m.

1 stop8h 17m

C$ 349

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Mon 6/10

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

1 stop10h 06m

Seattle/Tacoma Intl

Sun 12/10

7:15 p.m.-11:45 a.m.

2 stops13h 30m

C$ 357

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Mon 6/10

10:00 a.m.-7:31 p.m.

2 stops12h 31m

Seattle/Tacoma Intl

Mon 13/10

7:15 a.m.-6:34 p.m.

1 stop8h 19m

C$ 365

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 14/10

4:45 p.m.-7:04 p.m.

Nonstop5h 19m

Seattle/Tacoma Intl

Sun 26/10

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

Nonstop4h 40m

C$ 371

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 21/8

7:00 a.m.-10:59 p.m.

3 stops18h 59m

Seattle/Tacoma Intl

Mon 25/8

7:00 p.m.-10:04 a.m.

2 stops12h 04m

C$ 376

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 4/12

6:15 a.m.-2:43 p.m.

2 stops11h 28m

Seattle/Tacoma Intl

Sat 10/1

11:54 a.m.-11:00 p.m.

1 stop8h 06m

C$ 383

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 10/10

6:00 a.m.-2:24 p.m.

1 stop11h 24m

Seattle/Tacoma Intl

Sun 12/10

5:45 a.m.-4:46 p.m.

1 stop8h 01m

C$ 390

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 17/9

1:30 p.m.-8:29 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Wed 24/9

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

Nonstop4h 44m

C$ 413

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 25 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 27 June 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 3 July 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 38% 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 3 July 2025.

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

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

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 3 July 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

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
WestJet
7.2
Good
2,917 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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.

  • What are the cheapest airlines flying from Toronto to Seattle round-trip?

    According to our current data, WestJet (C$ 309), Air Canada (C$ 352), and Alaska Airlines (C$ 371) offers the cheapest pricing from Toronto to Seattle. These flights start at 37% 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$ 170. Users have also found prices from C$ 234 and C$ 237 on United Airlines and American Airlines, 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 Alaska Airlines (93%), Hawaiian Airlines (93%) and Air Tahiti Nui (88%).

  • What are the cheapest flights from Toronto to Seattle?

    Looking at all options, your cheapest flight can be booked for C$ 197. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 309 on average our data indicates C$ 522 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 Toronto?

Book flights to Toronto if you plan to visit one of these locations
Leavenworth
Tukwila
SeaTac
Tacoma
Marysville
Bothell
Renton
Olympia
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 3 July 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 3 July 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 188AverageC$ 402FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 328AverageC$ 497FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 351AverageC$ 492FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 359AverageC$ 591FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapestC$ 369AverageC$ 516FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Hawaiian AirlinesCheapestC$ 405AverageC$ 451FlexibilityNo 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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