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Cheap flights from Seattle to Toronto from C$ 142

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 25/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YTO
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

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

Cheap flight deals from Seattle to Toronto

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Toronto
Explore the most affordable flight options available from Seattle to Toronto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 December 2025.

Wed 31/128:10 a.m.SEA - YYZ
Nonstop4h 43mAir Canada
Wed 7/17:50 p.m.YYZ - SEA
Nonstop5h 26mAir Canada
Deal found 10/12C$ 348
Wed 31/125:02 a.m.SEA - YYZ
1 stop14h 39mUnited Airlines
Wed 7/17:50 p.m.YYZ - SEA
Nonstop5h 26mUnited Airlines
Deal found 10/12C$ 479
Wed 31/128:00 a.m.SEA - YYZ
Nonstop4h 35mMultiple Airlines
Mon 5/110:15 p.m.YYZ - SEA
2 stops38h 38mMultiple Airlines
Deal found 10/12C$ 512
Wed 31/128:10 a.m.SEA - YYZ
Nonstop4h 43mAir Canada
Mon 5/16:45 p.m.YYZ - SEA
1 stop17h 30mAir Canada
Deal found 10/12C$ 519
Wed 31/123:50 p.m.SEA - YYZ
2 stops14h 46mUnited Airlines
Mon 5/19:00 a.m.YYZ - SEA
1 stop12h 46mUnited Airlines
Deal found 10/12C$ 557
Sat 27/127:00 a.m.SEA - YYZ
1 stop13h 59mUnited Airlines
Tue 6/19:00 p.m.YYZ - SEA
1 stop17h 32mUnited Airlines
Deal found 10/12C$ 596
Sat 27/128:00 p.m.SEA - YYZ
1 stop6h 59mAir Canada
Tue 6/18:55 p.m.YYZ - SEA
2 stops15h 20mAir Canada
Deal found 10/12C$ 621
Mon 29/127:00 a.m.SEA - YYZ
1 stop11h 21mUnited Airlines
Mon 5/19:00 a.m.YYZ - SEA
1 stop12h 46mUnited Airlines
Deal found 9/12C$ 685
Mon 29/125:49 p.m.SEA - YTZ
1 stop22h 08mMultiple Airlines
Mon 5/19:20 a.m.YTZ - SEA
1 stop26h 25mMultiple Airlines
Deal found 9/12C$ 767
Wed 31/1210:39 p.m.SEA - YTZ
2 stops20h 24mMultiple Airlines
Mon 5/17:40 p.m.YTZ - SEA
1 stop17h 56mMultiple Airlines
Deal found 10/12C$ 819
Sun 21/1210:39 p.m.SEA - YTZ
2 stops14h 19mMultiple Airlines
Sun 4/19:20 a.m.YTZ - SEA
1 stop26h 25mMultiple Airlines
Deal found 9/12C$ 1,243
Tue 30/1210:39 p.m.SEA - YTZ
1 stop8h 56mMultiple Airlines
Mon 5/17:40 p.m.YTZ - SEA
1 stop17h 56mMultiple Airlines
Deal found 11/12C$ 1,262

Find flight deals from Seattle to Toronto

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Toronto (YTO). 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 12 December 2025.

Round-trip from

C$ 346

One-way from

C$ 142

Popular in

December

Cheapest in

November

Average price

C$ 763

Good round-trip deal

C$ 375 or less

Good one-way deal

C$ 267 or less
Air Canada
  • Air Canada
  • 17/1-20/1
  • Nonstop
  • 10h 09m total
  • Seattle to Toronto
Search Deals
Air Canada
  • Air Canada
  • 25/1
  • 1 total stop
  • 7h 15m total
  • Seattle to Toronto
Search Deals
High demand for flights, 7% potential price rise
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 28 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 Seattle/Tacoma Intl to Toronto (YTO).
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Toronto (YTO).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Toronto 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 12 December 2025.
Use the filters below to find and compare flights from Seattle to Toronto that are best for you.

Fly from

Seattle

Fly to

Toronto

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 30/1

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

Nonstop4h 40m

Toronto Pearson Intl

Sun 1/2

4:45 p.m.-7:17 p.m.

Nonstop5h 32m

C$ 350

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 12/2

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

Nonstop4h 40m

Toronto Pearson Intl

Sat 7/3

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

Nonstop5h 33m

C$ 361

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 5/3

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

Nonstop4h 40m

Toronto Pearson Intl

Mon 9/3

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

Nonstop5h 33m

C$ 376

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 6/3

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

Nonstop4h 40m

Toronto Pearson Intl

Mon 9/3

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

Nonstop5h 33m

C$ 376

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 12/3

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

Nonstop4h 40m

Toronto Pearson Intl

Sun 15/3

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

Nonstop5h 33m

C$ 376

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 24/1

6:48 a.m.-10:37 p.m.

1 stop12h 49m

Toronto Pearson Intl

Sat 31/1

9:00 a.m.-6:14 p.m.

1 stop12h 14m

C$ 381

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 20/1

5:00 a.m.-3:02 p.m.

1 stop7h 02m

Toronto Pearson Intl

Tue 27/1

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

1 stop11h 18m

C$ 388

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 25/1

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

1 stop23h 07m

Hamilton

Sun 1/2

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

1 stop23h 09m

C$ 394

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 7/1

5:00 a.m.-3:02 p.m.

1 stop7h 02m

Toronto Pearson Intl

Wed 14/1

11:00 a.m.-9:12 p.m.

2 stops13h 12m

C$ 394

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 21/1

11:45 p.m.-11:48 a.m.

1 stop9h 03m

Toronto Pearson Intl

Sat 24/1

11:00 a.m.-9:15 p.m.

2 stops13h 15m

C$ 394

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 60 results
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Best time to book a flight from Seattle to Toronto

Have a flexible travel schedule? Discover the best time to fly to Toronto from Seattle 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 Seattle to Toronto

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Toronto. Price data was last updated on 5 December 2025.

Booking 75 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Toronto. 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 Seattle to Toronto?

Currently, March is the cheapest month in which you can book a flight from Seattle to Toronto (average of C$ 167). Flying from Seattle to Toronto in May is currently the most expensive (average of C$ 375). 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 SEA to YTO?

Find hourly flight availability from Seattle to Toronto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 12 December 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 40% on flights from Seattle to Toronto by exploring options for tickets in the afternoon.

Weekly flight availability from Seattle to Toronto

Explore weekly flight availability from Seattle to Toronto. 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 12 December 2025.

The most flights from SEA to YTO are scheduled on a Monday (6 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing Toronto

Get insights into the airlines that provide service to Toronto. 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 Toronto. Reviews last updated 12 December 2025.
See what other customers who have flown with Alaska Airlines,WestJet, andAir Canada from Seattle to Toronto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,431 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,431 reviews
Alaska Airlines
8.0
Very good
11,431 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
WestJet
7.2
Good
3,194 reviews
Alaska Airlines
8.0
Very good
11,431 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Air Canada
7.1
Good
10,514 reviews
Alaska Airlines
8.0
Very good
11,431 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.1

Crew

8.5

Entertainment

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Toronto. 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 from for flights from Seattle to Toronto?

    Seattle/Tacoma Intl (SEA), located 18.4 km from the city centre, is the airport you fly out of when you book flights from Seattle to Toronto. 4 airlines have flights from Seattle/Tacoma Intl to Toronto on a regular basis. Booking flights from Seattle/Tacoma Intl to Toronto should not be difficult; the airport handles an average of 5 outbound flights to Toronto per day.

  • How long is the flight from Seattle to Toronto?

    For as low as C$ 350, Alaska Airlines can have you in Toronto from Seattle in 4h 40m. Airlines will cover a distance of 3306 km. Both multi-stop and direct flights can be found to your destination and back.

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

    According to our current data, United Airlines (C$ 190), WestJet (C$ 285), and Air Canada (C$ 322) offers the cheapest pricing from Seattle to Toronto. You may be able to fly from Seattle to Toronto for 65% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Seattle to Toronto one-way?

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as C$ 147. Users have also found prices from C$ 153 and C$ 162 on Alaska Airlines and Air Canada, respectively.

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

    Most travellers choose Seattle/Tacoma Intl - Toronto Pearson Intl, Seattle/Tacoma Intl - Toronto Island or Seattle/Tacoma Intl - Hamilton when deciding on the best route from Seattle to Toronto.

  • What are the most reliable airlines from Seattle to Toronto?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Toronto on time: Alaska Airlines (96%), Qatar Airways (96%), Hawaiian Airlines (94%).

  • What are the cheapest flights from Seattle to Toronto?

    On average you can expect to pay C$ 654 for a flight from Seattle to Toronto. The cheapest flight overall is C$ 137 while the most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl) is currently priced at C$ 298.

  • Can I find deals for flights from Seattle to Toronto that include hotel bookings?

    Yes. In addition to deals on Seattle to Toronto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Toronto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Toronto.

  • Can I find deals for business class flights from Seattle to Toronto?

    Yes. Cheapflights offers flight deals from Seattle to Toronto 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 Seattle to Toronto?

    Currently, March is the cheapest month in which you can book a flight from Seattle to Toronto (average of C$ 167). Flying from Seattle to Toronto in May is currently the most expensive (average of C$ 375). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from Seattle to Toronto

Discover the top 4 airlines that operate flights from Seattle to Toronto. 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 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 285AverageC$ 389FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 364AverageC$ 461FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Alaska AirlinesCheapestC$ 375AverageC$ 783FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 487AverageC$ 538FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Toronto?

Deals for Seattle to Toronto 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 Seattle to Toronto?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Toronto 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 Seattle to Toronto with no change fees?

Need flexible booking options for your flight to Toronto from Seattle? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Toronto become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Toronto from Seattle today and book when prices fit your budget.

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