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Cheap flights from Seattle to Toronto from C$ 270

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 30/9. 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

Find the cheapest flights from Seattle to Toronto

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:45 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
19h 05m2 stops Las Vegas Harry Reid Intl Calgary
Multiple Airlines Logo
6:05 a.m. - 6:45 p.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
15h 40m1 stop Calgary
C$ 598Multiple Airlines
Wed, 30 Sep - Sun, 4 Oct
Multiple Airlines Logo
7:35 p.m. - 3:00 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
16h 25m1 stop Calgary
Multiple Airlines Logo
6:05 a.m. - 6:45 p.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
15h 40m1 stop Calgary
C$ 614Multiple Airlines
Fri, 2 Oct - Sun, 4 Oct
WestJet Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
WestJet Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
C$ 615WestJet
Thu, 24 Sep - Mon, 28 Sep
Multiple Airlines Logo
7:35 p.m. - 3:00 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
16h 25m1 stop Calgary
Multiple Airlines Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
C$ 615Multiple Airlines
Fri, 18 Sep - Fri, 25 Sep
Multiple Airlines Logo
7:35 p.m. - 3:00 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
16h 25m1 stop Calgary
Multiple Airlines Logo
6:05 a.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
30h 35m1 stop Calgary
C$ 617Multiple Airlines
Wed, 30 Sep - Sun, 4 Oct
Multiple Airlines Logo
7:35 p.m. - 3:00 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
16h 25m1 stop Calgary
Multiple Airlines Logo
7:05 p.m. - 6:45 p.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
26h 40m3 stops Halifax Intl Edmonton Calgary
C$ 618Multiple Airlines
Fri, 18 Sep - Fri, 25 Sep
Multiple Airlines Logo
7:35 p.m. - 3:20 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
16h 45m2 stops Calgary Halifax Intl
Multiple Airlines Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
C$ 626Multiple Airlines
Mon, 7 Sep - Mon, 14 Sep
WestJet Logo
7:00 a.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
9h 50m1 stop Calgary
WestJet Logo
8:40 p.m. - 6:45 p.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
25h 05m1 stop Calgary
C$ 635WestJet
Sat, 29 Aug - Tue, 8 Sep
WestJet Logo
7:00 a.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
9h 50m1 stop Calgary
WestJet Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
C$ 635WestJet
Fri, 4 Sep - Sun, 13 Sep
WestJet Logo
7:00 a.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
9h 50m1 stop Calgary
WestJet Logo
8:40 p.m. - 6:45 p.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
25h 05m1 stop Calgary
C$ 635WestJet
Fri, 4 Sep - Tue, 8 Sep

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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
4 Sep
SEA7:00 a.m.Seattle/Tacoma Intl
9h 50m
1 stop
YKF7:50 p.m.Toronto Region of Waterloo Intl
13 Sep
YKF8:40 p.m.Toronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
C$ 635
WestJet
4 Sep
SEA7:00 a.m.Seattle/Tacoma Intl
9h 50m
1 stop
YKF7:50 p.m.Toronto Region of Waterloo Intl
7 Sep
YKF8:40 p.m.Toronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
C$ 636
WestJet
8 Sep
SEA7:00 a.m.Seattle/Tacoma Intl
9h 50m
1 stop
YKF7:50 p.m.Toronto Region of Waterloo Intl
12 Sep
YKF8:40 p.m.Toronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
C$ 643

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 6 August 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

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Wed 30/9

9:45 p.m.-7:50 p.m.

2 stops19h 05m

Toronto Region of Waterloo Intl

Sun 4/10

6:05 a.m.-6:45 p.m.

1 stop15h 40m

C$ 598

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Fri 2/10

7:35 p.m.-3:00 p.m.

1 stop16h 25m

Toronto Region of Waterloo Intl

Sun 4/10

6:05 a.m.-6:45 p.m.

1 stop15h 40m

C$ 614

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Thu 24/9

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

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 28/9

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

1 stop16h 00m

C$ 615

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Fri 18/9

7:35 p.m.-3:00 p.m.

1 stop16h 25m

Toronto Region of Waterloo Intl

Fri 25/9

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

1 stop16h 00m

C$ 615

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Wed 30/9

7:35 p.m.-3:00 p.m.

1 stop16h 25m

Toronto Region of Waterloo Intl

Sun 4/10

6:05 a.m.-9:40 a.m.

1 stop30h 35m

C$ 617

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Fri 18/9

7:35 p.m.-3:00 p.m.

1 stop16h 25m

Toronto Region of Waterloo Intl

Fri 25/9

7:05 p.m.-6:45 p.m.

3 stops26h 40m

C$ 618

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Mon 7/9

7:35 p.m.-3:20 p.m.

2 stops16h 45m

Toronto Region of Waterloo Intl

Mon 14/9

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

1 stop16h 00m

C$ 626

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Sat 29/8

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Tue 8/9

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

1 stop25h 05m

C$ 635
Quickest round-trip

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Fri 4/9

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Sun 13/9

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

1 stop16h 00m

C$ 635

SeattleToronto

SEA Seattle/Tacoma Intl - YKF Toronto Region of Waterloo Intl

SEAYKF

Seattle/Tacoma Intl

Fri 4/9

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Tue 8/9

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

1 stop25h 05m

C$ 635

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

9h 50m

Direct flights

None
The fastest flight from Seattle to Toronto Region of Waterloo Intl Airport takes 9h 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

Frequently asked questions about flying from Seattle to Toronto Region of Waterloo Intl Airport

  • 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 9h 50m.

  • 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.

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