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Cheap flights from Seattle to Toronto from $140

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 8/20. 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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Cheap round-trip flights

WestJet Logo
1:50 pm - 12:46 amSEA-YKF
7h 56m1 stop
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$302WestJet
Find Deal
Wed, Aug 27 - Thu, Aug 28
WestJet Logo
7:05 am - 6:56 pmSEA-YKF
8h 51m1 stop
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$303WestJet
Find Deal
Tue, Aug 26 - Sun, Aug 31
Logo
1:50 pm - 5:30 amSEA-YKF
12h 40m2 stops
Logo
6:30 am - 8:29 pmYKF-SEA
16h 59m2 stops
$317
Find Deal
Sat, Sep 20 - Wed, Sep 24
Logo
1:50 pm - 5:30 amSEA-YKF
12h 40m2 stops
Logo
6:15 am - 12:33 pmYKF-SEA
9h 18m1 stop
$324
Find Deal
Thu, Sep 11 - Sun, Sep 14
WestJet Logo
7:05 am - 12:46 amSEA-YKF
14h 41m1 stop
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$325WestJet
Find Deal
Sat, Aug 23 - Thu, Aug 28
WestJet Logo
2:05 pm - 12:46 amSEA-YKF
7h 41m1 stop
WestJet Logo
6:00 am - 4:16 pmYKF-SEA
13h 16m1 stop
$330WestJet
Find Deal
Tue, Aug 19 - Sat, Aug 23
WestJet Logo
7:35 pm - 12:46 amSEA-YKF
26h 11m1 stop
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$331WestJet
Find Deal
Fri, Aug 22 - Sun, Aug 24
Logo
1:50 pm - 5:30 amSEA-YKF
12h 40m2 stops
Logo
6:15 am - 12:33 pmYKF-SEA
9h 18m1 stop
$334
Find Deal
Thu, Sep 11 - Sun, Sep 14
Logo
1:15 pm - 5:15 amSEA-YKF
13h 00m2 stops
Logo
6:00 am - 8:29 pmYKF-SEA
17h 29m1 stop
$339
Find Deal
Fri, Sep 12 - Fri, Sep 19
WestJet Logo
7:05 am - 12:46 amSEA-YKF
14h 41m1 stop
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$346WestJet
Find Deal
Sat, Aug 23 - Wed, Aug 27

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
Aug 27
SEA1:50 pmSeattle/Tacoma Intl
7h 56m
1 stop
YKF12:46 amToronto Region of Waterloo Intl
Aug 28
YKF6:00 amToronto Region of Waterloo Intl
9h 58m
1 stop
SEA12:58 pmSeattle/Tacoma Intl
$302
Find similar
WestJet
Aug 26
SEA7:05 amSeattle/Tacoma Intl
8h 51m
1 stop
YKF6:56 pmToronto Region of Waterloo Intl
Aug 31
YKF6:00 amToronto Region of Waterloo Intl
9h 58m
1 stop
SEA12:58 pmSeattle/Tacoma Intl
$303
Find similar
WestJet
Aug 23
SEA7:05 amSeattle/Tacoma Intl
14h 41m
1 stop
YKF12:46 amToronto Region of Waterloo Intl
Aug 28
YKF6:00 amToronto Region of Waterloo Intl
9h 58m
1 stop
SEA12:58 pmSeattle/Tacoma Intl
$325
Find similar

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 July 31, 2025.
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

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 8/27

1:50 pm-12:46 am

1 stop7h 56m

Toronto Region of Waterloo Intl

Thu 8/28

6:00 am-12:58 pm

1 stop9h 58m

$302

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 8/26

7:05 am-6:56 pm

1 stop8h 51m

Toronto Region of Waterloo Intl

Sun 8/31

6:00 am-12:58 pm

1 stop9h 58m

$303

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 9/20

1:50 pm-5:30 am

2 stops12h 40m

Toronto Region of Waterloo Intl

Wed 9/24

6:30 am-8:29 pm

2 stops16h 59m

$317

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 9/11

1:50 pm-5:30 am

2 stops12h 40m

Toronto Region of Waterloo Intl

Sun 9/14

6:15 am-12:33 pm

1 stop9h 18m

$324

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 8/23

7:05 am-12:46 am

1 stop14h 41m

Toronto Region of Waterloo Intl

Thu 8/28

6:00 am-12:58 pm

1 stop9h 58m

$325

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 8/19

2:05 pm-12:46 am

1 stop7h 41m

Toronto Region of Waterloo Intl

Sat 8/23

6:00 am-4:16 pm

1 stop13h 16m

$330

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 8/22

7:35 pm-12:46 am

1 stop26h 11m

Toronto Region of Waterloo Intl

Sun 8/24

6:00 am-12:58 pm

1 stop9h 58m

$331

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 9/11

1:50 pm-5:30 am

2 stops12h 40m

Toronto Region of Waterloo Intl

Sun 9/14

6:15 am-12:33 pm

1 stop9h 18m

$334

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 9/12

1:15 pm-5:15 am

2 stops13h 00m

Toronto Region of Waterloo Intl

Fri 9/19

6:00 am-8:29 pm

1 stop17h 29m

$339

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 8/23

7:05 am-12:46 am

1 stop14h 41m

Toronto Region of Waterloo Intl

Wed 8/27

6:00 am-12:58 pm

1 stop9h 58m

$346

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 day to depart on your flight to Toronto Region of Waterloo Intl Airport?

According to our data, Wednesday is the cheapest day to fly to Toronto Region of Waterloo Intl Airport from Seattle. The lowest ticket price found for a Wednesday departure recently was $482. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Toronto Region of Waterloo Intl Airport is Thursday, with ticket prices averaging around $643.

What is the cheapest time of day to depart on your flight to Toronto Region of Waterloo Intl Airport?

In the morning is the cheapest time of day to fly from Seattle to Toronto Region of Waterloo Intl Airport when you can find flight prices for as low as $438. Flying to Toronto Region of Waterloo Intl Airport in the morning is an ideal time because this is during off-peak travel hours. Flights to Toronto Region of Waterloo Intl Airport are more costly at noon, with an average ticket price of $618. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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

Best Price Found

$140

Fastest flight time

7h 40m

Direct flights

None
The best one-way flight to Toronto Region of Waterloo Intl Airport from Seattle in the past 72 hours is $140. The best round-trip flight deal from Seattle to Toronto Region of Waterloo Intl Airport found on momondo in the last 72 hours is $302.
The fastest flight from Seattle to Toronto Region of Waterloo Intl Airport takes 7h 40m
There are no direct flights from Seattle to Toronto Region of Waterloo Intl Airport. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - 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 7h 41m 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

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.

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