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Cheap flights from Seattle to Toronto from C$ 256

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 5/5. 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
1 adult, Economy, 0 bags

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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 19m
1 stop
WestJet Logo
6:20 a.m. - 2:19 p.m.
YKF
-
SEA
10h 59m
1 stop
C$ 496WestJet
Fri, 17 Apr - Tue, 21 Apr
WestJet Logo
3:10 p.m. - 5:29 a.m.
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
C$ 499WestJet
Fri, 24 Apr - Fri, 1 May
WestJet Logo
3:10 p.m. - 5:29 a.m.
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
C$ 502WestJet
Sun, 19 Apr - Sun, 26 Apr
WestJet Logo
3:10 p.m. - 5:29 a.m.
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
C$ 506WestJet
Mon, 20 Apr - Mon, 27 Apr
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
C$ 507WestJet
Wed, 3 Jun - Mon, 8 Jun
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
C$ 514WestJet
Thu, 4 Jun - Sun, 7 Jun
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
C$ 516WestJet
Wed, 3 Jun - Mon, 8 Jun
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
C$ 517WestJet
Thu, 4 Jun - Mon, 22 Jun
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 p.m. - 6:45 p.m.
YKF
-
SEA
25h 05m
1 stop
C$ 525WestJet
Fri, 19 Jun - Tue, 23 Jun
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
C$ 527WestJet
Thu, 4 Jun - Mon, 22 Jun

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
17 Apr
SEA3:10 p.m.Seattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 a.m.Toronto Region of Waterloo Intl
21 Apr
YKF6:20 a.m.Toronto Region of Waterloo Intl
10h 59m
1 stop
SEA2:19 p.m.Seattle/Tacoma Intl
C$ 496
WestJet
24 Apr
SEA3:10 p.m.Seattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 a.m.Toronto Region of Waterloo Intl
1 May
YKF8:40 p.m.Toronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
C$ 499
WestJet
19 Apr
SEA3:10 p.m.Seattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 a.m.Toronto Region of Waterloo Intl
26 Apr
YKF8:40 p.m.Toronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
C$ 502

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 25 March 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
Quickest round-trip

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 17/4

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

1 stop11h 19m

Toronto Region of Waterloo Intl

Tue 21/4

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

1 stop10h 59m

C$ 496

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 24/4

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

1 stop11h 19m

Toronto Region of Waterloo Intl

Fri 1/5

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 499

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 19/4

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

1 stop11h 19m

Toronto Region of Waterloo Intl

Sun 26/4

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 502

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 20/4

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

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 27/4

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 506

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 3/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 8/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 507

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 4/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 7/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 514

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 3/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 8/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 516

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 4/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 22/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 517

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 19/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Tue 23/6

8:40 p.m.-6:45 p.m.

1 stop25h 05m

C$ 525

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 4/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 22/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 527

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

  • 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 8h 47m.

  • 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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