Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Seattle to Toronto from $146

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 3/16. 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

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to Toronto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:41 am - 5:29 am
SEA
-
YKF
17h 48m
2 stops
Multiple Airlines Logo
6:20 am - 2:19 pm
YKF
-
SEA
10h 59m
1 stop
$263Multiple Airlines
Fri, Apr 10 - Thu, Apr 16
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
$278WestJet
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
$290WestJet
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
$312WestJet
Thu, May 28 - Mon, Jun 1
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
$314WestJet
Tue, May 12 - Sun, May 17
WestJet Logo
3:10 pm - 5:29 am
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
6:20 am - 2:19 pm
YKF
-
SEA
10h 59m
1 stop
$405WestJet
Sun, Mar 29 - Mon, Apr 6
Multiple Airlines Logo
3:10 pm - 5:29 am
SEA
-
YKF
11h 19m
1 stop
Multiple Airlines Logo
7:05 am - 2:19 pm
YKF
-
SEA
10h 14m
1 stop
$406Multiple Airlines
Wed, Mar 25 - Fri, Mar 27
WestJet Logo
7:35 pm - 7:50 pm
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
6:00 am - 8:28 pm
YKF
-
SEA
17h 28m
1 stop
$413WestJet
Thu, Jun 4 - Mon, Jun 22
WestJet Logo
3:10 pm - 5:29 am
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
7:00 pm - 2:19 pm
YKF
-
SEA
22h 19m
1 stop
$419WestJet
Fri, Mar 13 - Sat, Mar 28
WestJet Logo
3:10 pm - 5:29 am
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
7:00 pm - 2:19 pm
YKF
-
SEA
22h 19m
1 stop
$428WestJet
Fri, Mar 13 - Sat, Mar 28

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 27
YKF8:40 pmToronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 amSeattle/Tacoma Intl
$278
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
$290
WestJet
May 28
SEA7:35 pmSeattle/Tacoma Intl
21h 15m
1 stop
YKF7:50 pmToronto Region of Waterloo Intl
Jun 1
YKF8:40 pmToronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 amSeattle/Tacoma Intl
$312

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 January 29, 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

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 4/10

8:41 am-5:29 am

2 stops17h 48m

Toronto Region of Waterloo Intl

Thu 4/16

6:20 am-2:19 pm

1 stop10h 59m

$263

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

$278

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

$290

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 5/28

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 6/1

8:40 pm-9:40 am

1 stop16h 00m

$312

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 5/12

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 5/17

8:40 pm-9:40 am

1 stop16h 00m

$314

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 3/29

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 4/6

6:20 am-2:19 pm

1 stop10h 59m

$405

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 3/25

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Fri 3/27

7:05 am-2:19 pm

1 stop10h 14m

$406

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

6:00 am-8:28 pm

1 stop17h 28m

$413

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 3/13

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Sat 3/28

7:00 pm-2:19 pm

1 stop22h 19m

$419

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 3/13

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Sat 3/28

7:00 pm-2:19 pm

1 stop22h 19m

$428

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to Toronto from

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 50m

Direct flights

None
The fastest flight from Seattle to Toronto Region of Waterloo Intl Airport takes 8h 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 8h 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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 2/28
Sat 3/7
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Toronto

Popular cities in Canada

Popular flights according to clicks in the last 7 days on momondo
Flights to Montreal Pierre Elliott Trudeau Intl Airportfrom $171
Flights to Toronto Pearson Intl Airportfrom $119
Flights to Toronto Island Airportfrom $158
Flights to Vancouver Intl Airport