Cheap flights from Seattle to Toronto from $111

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Toronto departing on 10/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Seattle to Toronto (SEA-YTO)

Cheap round-trip flights

WestJet Logo
1:50 pm - 12:40 amSEA-YHM
7h 50m1 stop
WestJet Logo
6:00 am - 12:59 pmYHM-SEA
9h 59m1 stop
$252WestJet
Find Deal
Fri, Oct 17 - Mon, Oct 20
 Logo
1:15 pm - 12:31 amSEA-YYZ
8h 16m1 stop
 Logo
4:45 pm - 7:08 pmYYZ-SEA
5h 23mnonstop
Fri, Oct 10 - Fri, Oct 17
WestJet Logo
1:50 pm - 12:22 amSEA-YYZ
7h 32m1 stop
WestJet Logo
8:00 am - 12:59 pmYYZ-SEA
7h 59m1 stop
$257WestJet
Find Deal
Sat, Oct 4 - Wed, Oct 15
WestJet Logo
1:50 pm - 12:45 amSEA-YKF
7h 55m1 stop
WestJet Logo
6:00 am - 12:59 pmYKF-SEA
9h 59m1 stop
$257WestJet
Find Deal
Fri, Oct 17 - Thu, Oct 23
WestJet Logo
1:50 pm - 12:22 amSEA-YYZ
7h 32m1 stop
WestJet Logo
1:30 pm - 7:14 pmYYZ-SEA
8h 44m1 stop
$258WestJet
Find Deal
Sat, Oct 4 - Tue, Oct 7
WestJet Logo
1:50 pm - 12:22 amSEA-YYZ
7h 32m1 stop
WestJet Logo
8:00 am - 12:59 pmYYZ-SEA
7h 59m1 stop
$259WestJet
Find Deal
Fri, Oct 17 - Mon, Oct 20
WestJet Logo
8:40 am - 12:31 amSEA-YYZ
12h 51m2 stops
WestJet Logo
6:45 am - 12:33 pmYYZ-SEA
8h 48m1 stop
$260WestJet
Find Deal
Thu, Oct 2 - Sun, Oct 12
Air Canada Logo
7:15 am - 7:49 pmSEA-YTZ
9h 34m1 stop
Air Canada Logo
4:10 pm - 10:26 pmYTZ-SEA
9h 16m2 stops
$274Air Canada
Find Deal
Fri, Oct 10 - Fri, Oct 17
Air Canada Logo
10:00 am - 10:36 pmSEA-YYZ
9h 36m1 stop
Air Canada Logo
8:40 am - 10:59 amYYZ-SEA
5h 19mnonstop
$291Air Canada
Find Deal
Thu, Sep 25 - Wed, Oct 1
Alaska Airlines Logo
7:16 am - 3:00 pmSEA-YYZ
4h 44mnonstop
Alaska Airlines Logo
4:45 pm - 7:08 pmYYZ-SEA
5h 23mnonstop
$294Alaska Airlines
Find Deal
Wed, Sep 24 - Wed, Oct 1

Air Canada flights from Seattle to Toronto

Our best Air Canada deals on Seattle to Toronto flight tickets
Air Canada
Oct 10
SEA7:15 amSeattle/Tacoma Intl
9h 34m
1 stop
YTZ7:49 pmToronto Island
Oct 17
YTZ4:10 pmToronto Island
9h 16m
2 stops
SEA10:26 pmSeattle/Tacoma Intl
Air Canada
Sep 25
SEA10:00 amSeattle/Tacoma Intl
9h 36m
1 stop
YYZ10:36 pmToronto Pearson Intl
Oct 1
YYZ8:40 amToronto Pearson Intl
5h 19m
SEA10:59 amSeattle/Tacoma Intl
Air Canada
Sep 23
SEA7:15 amSeattle/Tacoma Intl
9h 34m
1 stop
YTZ7:49 pmToronto Island
Sep 30
YTZ12:25 pmToronto Island
10h 06m
1 stop
SEA7:31 pmSeattle/Tacoma Intl

WestJet flights from Seattle to Toronto

Our best WestJet deals on Seattle to Toronto flight tickets
WestJet
Oct 17
SEA1:50 pmSeattle/Tacoma Intl
7h 50m
1 stop
YHM12:40 amHamilton
Oct 20
YHM6:00 amHamilton
9h 59m
1 stop
SEA12:59 pmSeattle/Tacoma Intl
WestJet
Oct 4
SEA1:50 pmSeattle/Tacoma Intl
7h 32m
1 stop
YYZ12:22 amToronto Pearson Intl
Oct 15
YYZ8:00 amToronto Pearson Intl
7h 59m
1 stop
SEA12:59 pmSeattle/Tacoma Intl
WestJet
Oct 4
SEA1:50 pmSeattle/Tacoma Intl
7h 32m
1 stop
YYZ12:22 amToronto Pearson Intl
Oct 7
YYZ1:30 pmToronto Pearson Intl
8h 44m
1 stop
SEA7:14 pmSeattle/Tacoma Intl

momondo 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, momondo users made 832,500 searches. Data last updated August 28, 2025.
Use the filters below to find and compare flights from Seattle to Toronto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 10/17

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

Mon 10/20

6:00 am-12:59 pm

1 stop9h 59m

$252

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 10/10

1:15 pm-12:31 am

1 stop8h 16m

Toronto Pearson Intl

Fri 10/17

4:45 pm-7:08 pm

Nonstop5h 23m

$256

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 10/4

1:50 pm-12:22 am

1 stop7h 32m

Toronto Pearson Intl

Wed 10/15

8:00 am-12:59 pm

1 stop7h 59m

$257

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 10/17

1:50 pm-12:45 am

1 stop7h 55m

Toronto Region of Waterloo Intl

Thu 10/23

6:00 am-12:59 pm

1 stop9h 59m

$257

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 10/4

1:50 pm-12:22 am

1 stop7h 32m

Toronto Pearson Intl

Tue 10/7

1:30 pm-7:14 pm

1 stop8h 44m

$258

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 10/17

1:50 pm-12:22 am

1 stop7h 32m

Toronto Pearson Intl

Mon 10/20

8:00 am-12:59 pm

1 stop7h 59m

$259

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 10/2

8:40 am-12:31 am

2 stops12h 51m

Toronto Pearson Intl

Sun 10/12

6:45 am-12:33 pm

1 stop8h 48m

$260

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Fri 10/10

7:15 am-7:49 pm

1 stop9h 34m

Toronto Island

Fri 10/17

4:10 pm-10:26 pm

2 stops9h 16m

$274

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 9/25

10:00 am-10:36 pm

1 stop9h 36m

Toronto Pearson Intl

Wed 10/1

8:40 am-10:59 am

Nonstop5h 19m

$291

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 9/24

7:16 am-3:00 pm

Nonstop4h 44m

Toronto Pearson Intl

Wed 10/1

4:45 pm-7:08 pm

Nonstop5h 23m

$294

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Toronto from

How to get the cheapest flight ticket from Seattle to Toronto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Seattle and Toronto?

What is the cheapest month to fly to Toronto?

The month of January is, on average, the cheapest month to fly to Toronto from Seattle, with most prices found around $283. If you are unable to visit Toronto during the month of January, then departing from Seattle during the month February is also very affordable. Most momondo users find prices during this month for around $286.

What is the cheapest day to depart on your flight to Toronto?

On average, the least expensive day to fly to Toronto from Seattle is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $548. However, this price may fluctuate depending on the airline, the season, and holidays. The most expensive day to fly to Toronto is Saturday, with ticket prices averaging around $701.

What is the cheapest time of day to depart on your flight to Toronto?

In the afternoon is the cheapest time of day to fly from Seattle to Toronto when you can find flight prices for as low as $283. Flying to Toronto in the afternoon is an ideal time because this is during off-peak travel hours. Flights to Toronto are more costly in the morning, with an average ticket price of $626. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Seattle/Tacoma Intl to Toronto flight route?

Fly from Seattle/Tacoma Intl to Toronto Pearson Intl for the best Seattle/Tacoma Intl - Toronto flight prices

How far in advance should I book a flight to Toronto?

You are more likely to see cheaper flights to Toronto from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Toronto for around $428 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Toronto from Seattle for as low as $292 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to Toronto flights?

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Toronto flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seattle to Toronto flights?

You could potentially save up to 30% on your flight if you consider stops on a Seattle to Toronto flight.

How have Seattle to Toronto flight prices changed over time?

As of August 2025, prices for Seattle to Toronto flights are approximately 36% cheaper when compared to flights at the same time last year.

When to book flights from Seattle to Toronto

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Toronto according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Toronto (SEA to YTO) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Toronto

Best Price Found

$165

Fastest flight time

4h 35m

Direct flights

Every day

Airports in Toronto

1 airport
The best one-way flight to Toronto from Seattle in the past 72 hours is $165. The best round-trip flight deal from Seattle to Toronto found on momondo in the last 72 hours is $440.
The fastest flight from Seattle to Toronto takes 4h 35m
Direct flights go from Seattle to Toronto every day.
There is 1 airport near Toronto: Toronto Pearson Intl (YYZ)
  • How far is Seattle/Tacoma Intl to Toronto by plane?

    Seattle/Tacoma Intl and Toronto are 2065.1 mi apart from one another. By plane, this route typically takes 4h 42m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Toronto?

    Prices for flights from Seattle/Tacoma Intl Airport to Toronto are updated daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Toronto?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Toronto?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Toronto.

  • What documentation or ID do you need to fly to Toronto?

    The travel and health documents you'll need for your trip to Toronto may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Toronto. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Seattle to Toronto?

  • What is the most popular airline from Seattle to Toronto?

Best airlines flying from Seattle to Toronto

Compare and see reviews for airlines that fly from Seattle to Toronto with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $128Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom $160Free CancellationRating
7.4
8,944 reviews
Search United Airlines flights
DeltaPriceFrom $182Free CancellationRating
7.9
7,977 reviews
Search Delta flights
WestJetPriceFrom $235Free CancellationRating
7.2
3,063 reviews
Search WestJet flights
Alaska AirlinesPriceFrom $276Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
  • Alaska Airlines Flights From Seattle to Toronto

    Alaska Airlines flight deals from Seattle to Toronto start from $276 round-trip. Over the 3 Alaska Airlines flights for this route in a normal week, average airfare is usually $502 round-trip - but some users have found much cheaper deals with momondo.

  • United Airlines Flights From Seattle to Toronto

    United Airlines is also a popular choice for this route. United Airlines flight deals for Seattle to Toronto start from as low as $160 round-trip, depending on your selected dates, with average United Airlines deals seen on momondo around $387. United Airlines operates 6 flights to Toronto from Seattle in an average week. Users have rated it 7.4/10 across 8,944 reviews.

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Toronto?

It is quick and easy to find Seattle to Toronto flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Toronto that suits you.

Can I find flights from Seattle to Toronto with flexible booking policies on momondo?

momondo does allow users to show only those flights to Toronto from Seattle which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Seattle to Toronto?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Toronto.

I’m not ready to book a flight from Seattle to Toronto right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Seattle to Toronto flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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1 adult
Tue 9/2
Tue 9/9

Find better results for your trip to Canada

Fly into one of these airports located in Toronto

Airports listed have a maximum distance of 52.0 mi from Toronto