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Cheap flights from Toronto to Seattle from C$ 186

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 20/4. Fares are subject to change and may not be available on all flights or dates of travel.
YTO — SEA
1 Jan — 8 Jan1
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 Friday and return on a Wednesday

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 2 December 2025.

Sun 14/126:30 a.m.YYZ - SEA
1 stop10h 50mWestJet
Wed 24/123:10 p.m.SEA - YYZ
1 stop18h 18mWestJet
Deal found 30/11C$ 347
Sun 14/124:45 p.m.YYZ - SEA
Nonstop5h 33mMultiple Airlines
Wed 24/123:10 p.m.SEA - YYZ
1 stop18h 18mMultiple Airlines
Deal found 30/11C$ 350
Mon 15/125:55 p.m.YYZ - SEA
1 stop9h 55mUnited Airlines
Tue 30/1211:59 p.m.SEA - YYZ
1 stop13h 03mUnited Airlines
Deal found 30/11C$ 378
Sun 14/125:55 p.m.YYZ - SEA
1 stop9h 55mUnited Airlines
Fri 26/1211:39 p.m.SEA - YYZ
1 stop16h 18mUnited Airlines
Deal found 30/11C$ 387
Sun 14/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Tue 30/128:00 a.m.SEA - YYZ
Nonstop4h 35mAlaska Airlines
Deal found 30/11C$ 391
Sun 14/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Mon 29/128:00 a.m.SEA - YYZ
Nonstop4h 35mAlaska Airlines
Deal found 30/11C$ 398
Sat 13/127:50 p.m.YYZ - SEA
Nonstop5h 26mAir Canada
Fri 13/38:10 a.m.SEA - YYZ
Nonstop4h 43mAir Canada
Deal found 30/11C$ 408
Tue 16/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Wed 31/128:00 a.m.SEA - YYZ
Nonstop4h 35mAlaska Airlines
Deal found 30/11C$ 410
Tue 16/122:15 p.m.YYZ - SEA
2 stops11h 13mUnited Airlines
Wed 31/125:02 a.m.SEA - YYZ
1 stop14h 39mUnited Airlines
Deal found 30/11C$ 411
Mon 15/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Thu 1/18:00 a.m.SEA - YYZ
Nonstop4h 35mAlaska Airlines
Deal found 30/11C$ 412
Mon 15/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Thu 25/123:10 p.m.SEA - YHM
1 stop19h 12mWestJet
Deal found 30/11C$ 622
Mon 15/126:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Tue 30/123:10 p.m.SEA - YHM
1 stop23h 07mWestJet
Deal found 30/11C$ 727

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 2 December 2025.

Round-trip from

C$ 277

One-way from

C$ 186

Popular in

December

Cheapest in

February

Average price

C$ 636

Good round-trip deal

C$ 370 or less

Good one-way deal

C$ 310 or less
WestJet
  • WestJet
  • 20/5-27/5
  • 2 total stops
  • 25h 03m total
  • Toronto to Seattle
Search Deals
WestJet
  • WestJet
  • 20/4
  • 1 total stop
  • 23h 09m total
  • Toronto to Seattle
Search Deals
Highest demand for flights based on searches. 1% potential increase in price (C$ 11 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 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 2 December 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

Thu 30/4

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

1 stop17h 28m

Seattle/Tacoma Intl

Sat 9/5

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

1 stop7h 35m

C$ 278

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 3/3

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

1 stop11h 29m

Seattle/Tacoma Intl

Tue 17/3

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

1 stop23h 06m

C$ 315

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sun 18/1

2:57 p.m.-11:15 p.m.

1 stop11h 18m

Seattle/Tacoma Intl

Wed 28/1

5:00 a.m.-7:45 p.m.

2 stops11h 45m

C$ 327

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 8/5

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

1 stop17h 28m

Seattle/Tacoma Intl

Sat 16/5

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

1 stop7h 35m

C$ 330

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 26/2

3:45 p.m.-11:00 p.m.

1 stop10h 15m

Seattle/Tacoma Intl

Mon 2/3

7:00 a.m.-9:21 p.m.

1 stop11h 21m

C$ 333

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 20/3

4:45 p.m.-7:05 p.m.

Nonstop5h 20m

Seattle/Tacoma Intl

Tue 28/4

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

Nonstop4h 40m

C$ 345

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 15/5

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

1 stop17h 28m

Seattle/Tacoma Intl

Sat 23/5

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

1 stop14h 35m

C$ 345

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 9/1

2:45 p.m.-10:43 p.m.

2 stops10h 58m

Seattle/Tacoma Intl

Sat 17/1

10:58 a.m.-9:21 p.m.

1 stop7h 23m

C$ 348

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sat 21/2

6:30 a.m.-11:30 p.m.

1 stop20h 00m

Seattle/Tacoma Intl

Thu 26/2

11:59 p.m.-9:58 a.m.

1 stop6h 59m

C$ 348

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Sat 30/5

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

1 stop10h 08m

Seattle/Tacoma Intl

Fri 5/6

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

1 stop14h 35m

C$ 355

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/11

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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 28 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$ 348). 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 2 December 2025.

A simple way to save on the total cost of your ticket is to fly from Toronto to Seattle in the afternoon. If you’re flexible enough to do this you can expect to save up to 11% 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 2 December 2025.

The most flights from YTO to SEA are scheduled on a Monday (7 on average). You will have fewer flight options on Tuesday, 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 72% 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.

How often are flights from Toronto to Seattle delayed?

About 20% of weekly flights between Toronto and Seattle have experienced delays in the past year, with the average delay time being 159 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?

Monday tends to have the lowest number of delays on this route, whereas Wednesday 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 8% of flights being delayed.

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 2 December 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
11,385 reviews
Check prices

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Alaska Airlines
8.0
Very good
11,385 reviews
Alaska Airlines
8.0
Very good
11,385 reviews
Check prices

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Delta
7.9
Good
8,009 reviews
Alaska Airlines
8.0
Very good
11,385 reviews
Check prices

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
United Airlines
7.4
Good
9,062 reviews
Alaska Airlines
8.0
Very good
11,385 reviews
Check prices

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
WestJet
7.2
Good
3,187 reviews
Alaska Airlines
8.0
Very good
11,385 reviews
Check prices

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.
Air Canada
7.1
Good
10,493 reviews
Alaska Airlines
8.0
Very good
11,385 reviews
Check prices

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.0

Food

7.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Marcie,Nov 2025

PIT - SEA

It was not a full flight, so I was able to enjoy a row to myself. Luck of the draw, I guess.

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, United Airlines, and Alaska Airlines can get you from Toronto to Seattle in just under 5h 20m. Your travel time can differ by up to 12h 08m. 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$ 129), Delta (C$ 257), and Alaska Airlines (C$ 296) offers the cheapest pricing from Toronto to Seattle. These flights start at 74% 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$ 186. Users have also found prices from C$ 202 and C$ 227 on Alaska Airlines and Delta, 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 Air Tahiti Nui (88%), Hawaiian Airlines (81%) and Alaska Airlines (70%).

  • What are the cheapest flights from Toronto to Seattle?

    Looking at all options, your cheapest flight can be booked for C$ 230. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 245 on average, our data indicates C$ 471 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$ 348). 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
Mukilteo
Tacoma
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 2 December 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 2 December 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 185AverageC$ 365FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 299AverageC$ 490FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 342AverageC$ 617FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 363AverageC$ 624FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapestC$ 366AverageC$ 500FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Hawaiian AirlinesCheapestC$ 416AverageC$ 469FlexibilityNo 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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