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Cheap flights from Seattle to Toronto from $127

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 4/6. 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

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Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
3:10 pm - 5:29 amSEA-YKF
11h 19m1 stop
WestJet Logo
6:20 am - 2:19 pmYKF-SEA
10h 59m1 stop
$264WestJet
Find Deal
Mon, Mar 23 - Tue, Mar 31
WestJet Logo
3:10 pm - 5:29 amSEA-YKF
11h 19m1 stop
WestJet Logo
6:20 am - 2:19 pmYKF-SEA
10h 59m1 stop
$265WestJet
Find Deal
Mon, Feb 23 - Thu, Feb 26
WestJet Logo
3:10 pm - 5:29 amSEA-YKF
11h 19m1 stop
WestJet Logo
7:00 pm - 2:19 pmYKF-SEA
22h 19m1 stop
$277WestJet
Find Deal
Sun, Mar 8 - Sat, Mar 14
WestJet Logo
3:10 pm - 5:29 amSEA-YKF
11h 19m1 stop
WestJet Logo
6:20 am - 2:19 pmYKF-SEA
10h 59m1 stop
$280WestJet
Find Deal
Wed, Mar 25 - Mon, Mar 30
WestJet Logo
3:10 pm - 5:29 amSEA-YKF
11h 19m1 stop
WestJet Logo
6:20 am - 2:19 pmYKF-SEA
10h 59m1 stop
$303WestJet
Find Deal
Sun, Mar 22 - Thu, Mar 26
Multiple Airlines Logo
11:55 am - 4:00 pmSEA-YKF
25h 05m3 stops
Multiple Airlines Logo
7:05 am - 2:20 pmYKF-SEA
10h 15m1 stop
$389Multiple Airlines
Find Deal
Fri, Nov 21 - Sun, Nov 23
Multiple Airlines Logo
11:55 am - 5:28 amSEA-YKF
14h 33m2 stops
Multiple Airlines Logo
7:05 am - 2:20 pmYKF-SEA
10h 15m1 stop
$402Multiple Airlines
Find Deal
Fri, Nov 21 - Sun, Nov 23
WestJet Logo
3:10 pm - 5:28 amSEA-YKF
11h 18m1 stop
WestJet Logo
7:00 pm - 2:20 pmYKF-SEA
22h 20m1 stop
$428WestJet
Find Deal
Sun, Jan 11 - Sat, Jan 17
Multiple Airlines Logo
11:55 am - 4:00 pmSEA-YKF
25h 05m3 stops
Multiple Airlines Logo
7:05 am - 10:22 amYKF-SEA
30h 17m2 stops
$448Multiple Airlines
Find Deal
Fri, Nov 21 - Sun, Nov 23
WestJet Logo
3:10 pm - 5:28 amSEA-YKF
11h 18m1 stop
WestJet Logo
6:20 am - 2:20 pmYKF-SEA
11h 00m1 stop
$466WestJet
Find Deal
Sun, Dec 7 - Thu, Dec 11

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
Mar 23
SEA3:10 pmSeattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 amToronto Region of Waterloo Intl
Mar 31
YKF6:20 amToronto Region of Waterloo Intl
10h 59m
1 stop
SEA2:19 pmSeattle/Tacoma Intl
$264
Find similar
WestJet
Feb 23
SEA3:10 pmSeattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 amToronto Region of Waterloo Intl
Feb 26
YKF6:20 amToronto Region of Waterloo Intl
10h 59m
1 stop
SEA2:19 pmSeattle/Tacoma Intl
$265
Find similar
WestJet
Mar 8
SEA3:10 pmSeattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 amToronto Region of Waterloo Intl
Mar 14
YKF7:00 pmToronto Region of Waterloo Intl
22h 19m
1 stop
SEA2:19 pmSeattle/Tacoma Intl
$277
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 November 3, 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

Mon 3/23

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Tue 3/31

6:20 am-2:19 pm

1 stop10h 59m

$264

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 2/23

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Thu 2/26

6:20 am-2:19 pm

1 stop10h 59m

$265

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 3/8

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Sat 3/14

7:00 pm-2:19 pm

1 stop22h 19m

$277

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 3/25

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 3/30

6:20 am-2:19 pm

1 stop10h 59m

$280

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 3/22

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Thu 3/26

6:20 am-2:19 pm

1 stop10h 59m

$303

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 11/21

11:55 am-4:00 pm

3 stops25h 05m

Toronto Region of Waterloo Intl

Sun 11/23

7:05 am-2:20 pm

1 stop10h 15m

$389

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 11/21

11:55 am-5:28 am

2 stops14h 33m

Toronto Region of Waterloo Intl

Sun 11/23

7:05 am-2:20 pm

1 stop10h 15m

$402

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 1/11

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Sat 1/17

7:00 pm-2:20 pm

1 stop22h 20m

$428

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 11/21

11:55 am-4:00 pm

3 stops25h 05m

Toronto Region of Waterloo Intl

Sun 11/23

7:05 am-10:22 am

2 stops30h 17m

$448

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 12/7

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Thu 12/11

6:20 am-2:20 pm

1 stop11h 00m

$466

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

Direct flights

None
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 10h 42m 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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