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Cheap flights from Seattle to Toronto from $179

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 4/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
3:10 pm - 5:29 am
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
8:40 pm - 9:40 am
YKF
-
SEA
16h 00m
1 stop
$327WestJet
Wed, Apr 22 - Mon, Apr 27
WestJet Logo
3:10 pm - 5:29 am
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
8:40 pm - 9:40 am
YKF
-
SEA
16h 00m
1 stop
$344WestJet
Wed, Apr 22 - Wed, Apr 29
WestJet Logo
3:10 pm - 5:29 am
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
8:40 pm - 9:40 am
YKF
-
SEA
16h 00m
1 stop
$349WestJet
Wed, Apr 22 - Mon, Apr 27
WestJet Logo
7:35 pm - 7:50 pm
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 pm - 9:40 am
YKF
-
SEA
16h 00m
1 stop
$352WestJet
Thu, Jun 4 - Mon, Jun 22
WestJet Logo
7:35 pm - 7:50 pm
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 pm - 6:45 pm
YKF
-
SEA
25h 05m
1 stop
$356WestJet
Wed, Jun 3 - Mon, Jun 8
WestJet Logo
7:35 pm - 7:50 pm
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 pm - 9:40 am
YKF
-
SEA
16h 00m
1 stop
$358WestJet
Wed, Jun 3 - Mon, Jun 8
WestJet Logo
7:35 pm - 7:50 pm
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 pm - 9:40 am
YKF
-
SEA
16h 00m
1 stop
$367WestJet
Sun, Apr 26 - Sun, May 3
WestJet Logo
7:00 am - 7:50 pm
SEA
-
YKF
9h 50m
1 stop
WestJet Logo
8:40 pm - 6:45 pm
YKF
-
SEA
25h 05m
1 stop
$368WestJet
Sat, Jun 20 - Thu, Jun 25
WestJet Logo
7:35 pm - 7:50 pm
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 pm - 9:40 am
YKF
-
SEA
16h 00m
1 stop
$378WestJet
Fri, Jun 12 - Sun, Jun 14
WestJet Logo
7:00 am - 7:50 pm
SEA
-
YKF
9h 50m
1 stop
WestJet Logo
8:40 pm - 9:40 am
YKF
-
SEA
16h 00m
1 stop
$388WestJet
Sat, Jun 20 - Thu, Jun 25

WestJet flights from Seattle to Toronto Region of Waterloo Intl Airport

Our best WestJet deals on Seattle to Toronto Region of Waterloo Intl Airport flight tickets
WestJet
Apr 22
SEA3:10 pmSeattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 amToronto Region of Waterloo Intl
Apr 29
YKF8:40 pmToronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 amSeattle/Tacoma Intl
$344
WestJet
Apr 22
SEA3:10 pmSeattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 amToronto Region of Waterloo Intl
Apr 27
YKF8:40 pmToronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 amSeattle/Tacoma Intl
$349
WestJet
Jun 4
SEA7:35 pmSeattle/Tacoma Intl
21h 15m
1 stop
YKF7:50 pmToronto Region of Waterloo Intl
Jun 22
YKF8:40 pmToronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 amSeattle/Tacoma Intl
$352

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Toronto Region of Waterloo Intl Airport 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 March 15, 2026.
Use the filters below to find and compare flights from Seattle to Toronto Region of Waterloo Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 4/22

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 4/27

8:40 pm-9:40 am

1 stop16h 00m

$327

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 4/22

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Wed 4/29

8:40 pm-9:40 am

1 stop16h 00m

$344

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 4/22

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 4/27

8:40 pm-9:40 am

1 stop16h 00m

$349

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 6/4

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 6/22

8:40 pm-9:40 am

1 stop16h 00m

$352

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 6/3

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 6/8

8:40 pm-6:45 pm

1 stop25h 05m

$356

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 6/3

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 6/8

8:40 pm-9:40 am

1 stop16h 00m

$358

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 4/26

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 5/3

8:40 pm-9:40 am

1 stop16h 00m

$367

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 6/20

7:00 am-7:50 pm

1 stop9h 50m

Toronto Region of Waterloo Intl

Thu 6/25

8:40 pm-6:45 pm

1 stop25h 05m

$368

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 6/12

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 6/14

8:40 pm-9:40 am

1 stop16h 00m

$378
Quickest round-trip

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 6/20

7:00 am-7:50 pm

1 stop9h 50m

Toronto Region of Waterloo Intl

Thu 6/25

8:40 pm-9:40 am

1 stop16h 00m

$388

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Seattle to Toronto Region of Waterloo Intl Airport

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 cheapest airline that flies from Seattle/Tacoma Intl to Toronto Region of Waterloo Intl?

WestJet is the most popular carrier operating from Seattle/Tacoma Intl to Toronto Region of Waterloo Intl

When to book flights from Seattle to Toronto Region of Waterloo Intl Airport

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

Cheap Seattle to Toronto Region of Waterloo Intl Airport (SEA to YKF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Toronto Region of Waterloo Intl Airport

Fastest flight time

9h 50m

Direct flights

None
The fastest flight from Seattle to Toronto Region of Waterloo Intl Airport takes 9h 50m
There are no direct flights from Seattle to Toronto Region of Waterloo Intl Airport. There are no popular flight routes from Seattle to Toronto Region of Waterloo Intl Airport.
Search flight deals

  • How far is Seattle/Tacoma Intl to Toronto Region of Waterloo Intl by plane?

    Seattle/Tacoma Intl and Toronto Region of Waterloo Intl are 2024.0 mi apart from one another. Typically, this will take 9h 50m by plane in normal conditions.

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

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

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

    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 Region of Waterloo Intl Airport.

  • What documentation or ID do you need to fly to Toronto Region of Waterloo Intl Airport?

    The required travel and health documents for your Toronto Region of Waterloo Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Toronto Region of Waterloo Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near Toronto?

Book flights to Toronto if you plan to visit one of these locations
Sauble Beach
Southampton
Port Elgin

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Toronto from Seattle.

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?

Once you have performed a search for Seattle to Toronto flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to Toronto from Seattle are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Toronto Region of Waterloo Intl Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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