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Cheap flights from Seattle to Toronto from C$ 178

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 6/4. 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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Find the cheapest flights from Seattle to Toronto

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
3:10 p.m. - 5:29 a.m.SEA-YKF
11h 19m1 stop
WestJet Logo
6:20 a.m. - 2:19 p.m.YKF-SEA
10h 59m1 stop
C$ 370WestJet
Find Deal
Mon, 23 Mar - Tue, 31 Mar
WestJet Logo
3:10 p.m. - 5:29 a.m.SEA-YKF
11h 19m1 stop
WestJet Logo
7:00 p.m. - 2:19 p.m.YKF-SEA
22h 19m1 stop
C$ 388WestJet
Find Deal
Sun, 8 Mar - Sat, 14 Mar
WestJet Logo
3:10 p.m. - 5:29 a.m.SEA-YKF
11h 19m1 stop
WestJet Logo
6:20 a.m. - 2:19 p.m.YKF-SEA
10h 59m1 stop
C$ 392WestJet
Find Deal
Wed, 25 Mar - Mon, 30 Mar
WestJet Logo
3:10 p.m. - 5:29 a.m.SEA-YKF
11h 19m1 stop
WestJet Logo
6:20 a.m. - 2:19 p.m.YKF-SEA
10h 59m1 stop
C$ 424WestJet
Find Deal
Fri, 20 Mar - Mon, 30 Mar
Multiple Airlines Logo
3:10 p.m. - 5:29 a.m.SEA-YKF
11h 19m1 stop
Multiple Airlines Logo
7:05 a.m. - 2:19 p.m.YKF-SEA
10h 14m1 stop
C$ 478Multiple Airlines
Find Deal
Mon, 2 Mar - Thu, 5 Mar
WestJet Logo
11:55 a.m. - 5:28 a.m.SEA-YKF
14h 33m3 stops
WestJet Logo
6:20 a.m. - 2:20 p.m.YKF-SEA
11h 00m1 stop
C$ 509WestJet
Find Deal
Fri, 9 Jan - Mon, 12 Jan
Multiple Airlines Logo
3:10 p.m. - 5:29 a.m.SEA-YKF
11h 19m1 stop
Multiple Airlines Logo
7:05 a.m. - 10:21 a.m.YKF-SEA
30h 16m2 stops
C$ 510Multiple Airlines
Find Deal
Mon, 2 Mar - Thu, 5 Mar
WestJet Logo
3:10 p.m. - 5:29 a.m.SEA-YKF
11h 19m1 stop
WestJet Logo
7:00 p.m. - 10:21 a.m.YKF-SEA
18h 21m3 stops
C$ 542WestJet
Find Deal
Sun, 15 Feb - Sat, 21 Feb
WestJet Logo
3:10 p.m. - 5:29 a.m.SEA-YKF
11h 19m1 stop
WestJet Logo
7:00 p.m. - 10:21 a.m.YKF-SEA
18h 21m2 stops
C$ 556WestJet
Find Deal
Sun, 15 Feb - Sat, 21 Feb
WestJet Logo
11:55 a.m. - 5:29 a.m.SEA-YKF
14h 34m2 stops
WestJet Logo
7:00 p.m. - 10:21 a.m.YKF-SEA
18h 21m3 stops
C$ 574WestJet
Find Deal
Sun, 15 Feb - Sat, 21 Feb

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
23 Mar
SEA3:10 p.m.Seattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 a.m.Toronto Region of Waterloo Intl
31 Mar
YKF6:20 a.m.Toronto Region of Waterloo Intl
10h 59m
1 stop
SEA2:19 p.m.Seattle/Tacoma Intl
C$ 370
Find similar
WestJet
8 Mar
SEA3:10 p.m.Seattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 a.m.Toronto Region of Waterloo Intl
14 Mar
YKF7:00 p.m.Toronto Region of Waterloo Intl
22h 19m
1 stop
SEA2:19 p.m.Seattle/Tacoma Intl
C$ 388
Find similar
WestJet
25 Mar
SEA3:10 p.m.Seattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 a.m.Toronto Region of Waterloo Intl
30 Mar
YKF6:20 a.m.Toronto Region of Waterloo Intl
10h 59m
1 stop
SEA2:19 p.m.Seattle/Tacoma Intl
C$ 392
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 96,600 searches. Data last updated 3 November 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 23/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Tue 31/3

6:20 a.m.-2:19 p.m.

1 stop10h 59m

C$ 370

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 8/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Sat 14/3

7:00 p.m.-2:19 p.m.

1 stop22h 19m

C$ 388

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 25/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 30/3

6:20 a.m.-2:19 p.m.

1 stop10h 59m

C$ 392

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 20/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 30/3

6:20 a.m.-2:19 p.m.

1 stop10h 59m

C$ 424

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 2/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Thu 5/3

7:05 a.m.-2:19 p.m.

1 stop10h 14m

C$ 478

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 9/1

11:55 a.m.-5:28 a.m.

3 stops14h 33m

Toronto Region of Waterloo Intl

Mon 12/1

6:20 a.m.-2:20 p.m.

1 stop11h 00m

C$ 509

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 2/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Thu 5/3

7:05 a.m.-10:21 a.m.

2 stops30h 16m

C$ 510

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 15/2

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Sat 21/2

7:00 p.m.-10:21 a.m.

3 stops18h 21m

C$ 542

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 15/2

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Sat 21/2

7:00 p.m.-10:21 a.m.

2 stops18h 21m

C$ 556

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 15/2

11:55 a.m.-5:29 a.m.

2 stops14h 34m

Toronto Region of Waterloo Intl

Sat 21/2

7:00 p.m.-10:21 a.m.

3 stops18h 21m

C$ 574

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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

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?

    The distance between Seattle/Tacoma Intl and Toronto Region of Waterloo Intl is about 3257.4 km. A reasonable flight in good conditions will take 10h 42m.

  • 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 refresh daily.

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 travel and health documents required for your trip to Toronto Region of Waterloo Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Toronto Region of Waterloo Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Travelling to a place near Toronto?

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

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Seattle to Toronto for you.

Can I find flights from Seattle to Toronto with flexible booking policies on momondo?

All flight searches from Seattle to Toronto on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Toronto?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Toronto from Seattle.

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

If you are not ready to book a flight from Seattle to Toronto now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Toronto and let you know when they change.

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

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