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Cheap flights from Seattle to Toronto from $156

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 5/28. 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
0 bags

Find the cheapest flights from Seattle to Toronto

Cheap round-trip flights

Enter your travel dates to find the best prices.
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
$352WestJet
Thu, May 28 - Thu, Jun 4
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
$359WestJet
Fri, Jun 12 - Fri, Jun 19
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
$374WestJet
Fri, Aug 21 - Mon, Aug 24
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
$379WestJet
Fri, Jun 12 - Fri, Jun 19
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
$384WestJet
Wed, Jun 10 - Sat, Jun 13
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
$386WestJet
Fri, Jun 19 - Sun, Jun 28
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
$394WestJet
Fri, Jun 19 - Sun, Jun 28
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
$395WestJet
Thu, Aug 20 - Mon, Aug 24
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
$400WestJet
Fri, Jun 12 - Wed, Jun 17
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
$404WestJet
Fri, Aug 21 - Mon, Aug 24

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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
May 28
SEA7:35 pmSeattle/Tacoma Intl
21h 15m
1 stop
YKF7:50 pmToronto Region of Waterloo Intl
Jun 4
YKF8:40 pmToronto Region of Waterloo Intl
25h 05m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
$352
WestJet
Jun 12
SEA7:35 pmSeattle/Tacoma Intl
21h 15m
1 stop
YKF7:50 pmToronto Region of Waterloo Intl
Jun 19
YKF8:40 pmToronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 amSeattle/Tacoma Intl
$359
WestJet
Aug 21
SEA7:00 amSeattle/Tacoma Intl
9h 50m
1 stop
YKF7:50 pmToronto Region of Waterloo Intl
Aug 24
YKF8:40 pmToronto Region of Waterloo Intl
25h 05m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
$374

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 May 5, 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

Thu 5/28

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Thu 6/4

8:40 pm-6:45 pm

1 stop25h 05m

$352

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 6/12

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Fri 6/19

8:40 pm-9:40 am

1 stop16h 00m

$359

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 8/21

7:00 am-7:50 pm

1 stop9h 50m

Toronto Region of Waterloo Intl

Mon 8/24

8:40 pm-6:45 pm

1 stop25h 05m

$374

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 6/12

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Fri 6/19

8:40 pm-9:40 am

1 stop16h 00m

$379

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 6/10

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sat 6/13

8:40 pm-6:45 pm

1 stop25h 05m

$384

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 6/19

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 6/28

8:40 pm-9:40 am

1 stop16h 00m

$386
Quickest round-trip

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 6/19

7:00 am-7:50 pm

1 stop9h 50m

Toronto Region of Waterloo Intl

Sun 6/28

8:40 pm-9:40 am

1 stop16h 00m

$394

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 8/20

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 8/24

8:40 pm-9:40 am

1 stop16h 00m

$395

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 6/12

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Wed 6/17

8:40 pm-9:40 am

1 stop16h 00m

$400

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 8/21

7:00 am-7:50 pm

1 stop9h 50m

Toronto Region of Waterloo Intl

Mon 8/24

8:40 pm-9:40 am

1 stop16h 00m

$404

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

8h 47m

Direct flights

None
The fastest flight from Seattle to Toronto Region of Waterloo Intl Airport takes 8h 47m
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

Frequently asked questions about flying from Seattle to Toronto Region of Waterloo Intl Airport

  • 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 8h 47m 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

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