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Cheap flights from Toronto Region of Waterloo Intl Airport to Seattle from C$ 202

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Toronto Region of Waterloo Intl Airport to Seattle departing on 27/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Toronto Region of Waterloo Intl Airport to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
8:40 p.m. - 6:45 p.m.
YKF
-
SEA
25h 05m
1 stop
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
C$ 329WestJet
Sun, 10 May - Sat, 23 May
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
C$ 333WestJet
Wed, 20 May - Tue, 2 Jun
WestJet Logo
7:00 p.m. - 2:19 p.m.
YKF
-
SEA
22h 19m
1 stop
WestJet Logo
3:10 p.m. - 5:29 a.m.
SEA
-
YKF
11h 19m
1 stop
C$ 336WestJet
Sat, 11 Apr - Wed, 15 Apr
WestJet Logo
8:40 p.m. - 6:45 p.m.
YKF
-
SEA
25h 05m
1 stop
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
C$ 344WestJet
Fri, 8 May - Tue, 12 May
WestJet Logo
8:40 p.m. - 6:45 p.m.
YKF
-
SEA
25h 05m
1 stop
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
C$ 347WestJet
Fri, 22 May - Thu, 28 May
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
C$ 354WestJet
Thu, 4 Jun - Tue, 9 Jun
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
C$ 355WestJet
Mon, 27 Apr - Thu, 30 Apr
WestJet Logo
8:40 p.m. - 9:00 p.m.
YKF
-
SEA
27h 20m
1 stop
WestJet Logo
7:00 a.m. - 7:50 p.m.
SEA
-
YKF
9h 50m
1 stop
C$ 357WestJet
Sun, 14 Jun - Sat, 20 Jun
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
WestJet Logo
7:00 a.m. - 7:50 p.m.
SEA
-
YKF
9h 50m
1 stop
C$ 369WestJet
Thu, 4 Jun - Tue, 23 Jun
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
C$ 391WestJet
Fri, 1 May - Tue, 5 May

WestJet flights from Toronto Region of Waterloo Intl Airport to Seattle

Our best WestJet deals on Toronto Region of Waterloo Intl Airport to Seattle flight tickets
WestJet
10 May
YKF8:40 p.m.Toronto Region of Waterloo Intl
25h 05m
1 stop
SEA6:45 p.m.Seattle/Tacoma Intl
23 May
SEA7:35 p.m.Seattle/Tacoma Intl
21h 15m
1 stop
YKF7:50 p.m.Toronto Region of Waterloo Intl
C$ 329
WestJet
20 May
YKF8:40 p.m.Toronto Region of Waterloo Intl
16h 00m
1 stop
SEA9:40 a.m.Seattle/Tacoma Intl
2 Jun
SEA7:35 p.m.Seattle/Tacoma Intl
21h 15m
1 stop
YKF7:50 p.m.Toronto Region of Waterloo Intl
C$ 333
WestJet
11 Apr
YKF7:00 p.m.Toronto Region of Waterloo Intl
22h 19m
1 stop
SEA2:19 p.m.Seattle/Tacoma Intl
15 Apr
SEA3:10 p.m.Seattle/Tacoma Intl
11h 19m
1 stop
YKF5:29 a.m.Toronto Region of Waterloo Intl
C$ 336

momondo Fare Finder

 
Customize your flight search to find flights from Toronto Region of Waterloo Intl Airport to Seattle 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 1 April 2026.
Use the filters below to find and compare flights from Toronto Region of Waterloo Intl Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sun 10/5

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

1 stop25h 05m

Seattle/Tacoma Intl

Sat 23/5

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

1 stop21h 15m

C$ 329

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Wed 20/5

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

1 stop16h 00m

Seattle/Tacoma Intl

Tue 2/6

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

1 stop21h 15m

C$ 333

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sat 11/4

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

1 stop22h 19m

Seattle/Tacoma Intl

Wed 15/4

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

1 stop11h 19m

C$ 336

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Fri 8/5

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

1 stop25h 05m

Seattle/Tacoma Intl

Tue 12/5

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

1 stop21h 15m

C$ 344

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Fri 22/5

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

1 stop25h 05m

Seattle/Tacoma Intl

Thu 28/5

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

1 stop21h 15m

C$ 347

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 4/6

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

1 stop16h 00m

Seattle/Tacoma Intl

Tue 9/6

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

1 stop21h 15m

C$ 354

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Mon 27/4

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

1 stop16h 00m

Seattle/Tacoma Intl

Thu 30/4

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

1 stop21h 15m

C$ 355

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sun 14/6

8:40 p.m.-9:00 p.m.

1 stop27h 20m

Seattle/Tacoma Intl

Sat 20/6

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

1 stop9h 50m

C$ 357
Quickest round-trip

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 4/6

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

1 stop16h 00m

Seattle/Tacoma Intl

Tue 23/6

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

1 stop9h 50m

C$ 369

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Fri 1/5

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

1 stop16h 00m

Seattle/Tacoma Intl

Tue 5/5

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

1 stop21h 15m

C$ 391

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 Seattle from

How to get the cheapest flight ticket from Toronto Region of Waterloo Intl Airport to Seattle

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 Seattle?

Our data shows that Friday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 562. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 865. These prices are subject to change though, so be sure to set up a Price Alert for flights to Seattle.

What is the cheapest time of day to depart on your flight to Seattle?

Our most recent data shows that the best time of day to fly to Seattle is in the evening. Flights from Toronto Region of Waterloo Intl Airport to Seattle during this time can be as low as C$ 519. Flights in the morning are often more expensive with an average ticket price of C$ 946.

Can stopping save me money on Toronto Region of Waterloo Intl Airport to Seattle flights?

You could potentially save up to 63% on your flight if you consider stops on a Toronto Region of Waterloo Intl Airport to Seattle flight.

When to book flights from Toronto Region of Waterloo Intl Airport to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Toronto Region of Waterloo Intl Airport to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Toronto Region of Waterloo Intl Airport to Seattle (YKF to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Toronto Region of Waterloo Intl Airport to Seattle

Fastest flight time

10h 14m

Direct flights

None
The fastest flight from Toronto Region of Waterloo Intl Airport to Seattle takes 10h 14m
There are no direct flights from Toronto Region of Waterloo Intl Airport to Seattle. There are no popular flight routes from Toronto Region of Waterloo Intl Airport to Seattle.
Search flight deals

  • How far is Toronto Region of Waterloo Intl to Seattle/Tacoma Intl by plane?

    A flight from Toronto Region of Waterloo Intl to Seattle/Tacoma Intl will travel around 3257.4 km. By plane, this route typically takes 10h 14m.

  • When did momondo last update prices for flights from Toronto Region of Waterloo Intl Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Toronto Region of Waterloo Intl Airport to Seattle/Tacoma Intl Airport are updated daily.

  • How many operators does momondo search for flights from Toronto Region of Waterloo Intl Airport to Seattle/Tacoma Intl Airport?

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

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents required for your trip to Seattle/Tacoma 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 Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Toronto Region of Waterloo Intl Airport to Seattle?

Best airlines flying from Toronto Region of Waterloo Intl Airport to Seattle

Compare and see reviews for airlines that fly from Toronto Region of Waterloo Intl Airport to Seattle with momondo
Airline
Rating
Free Cancellation
Price
WestJetPriceFrom C$ 129Free CancellationRating
7.2
3,308 reviews
Search WestJet flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Leavenworth
SeaTac
Marysville
Redmond
Kirkland
Tacoma
Puyallup
Tukwila
Olympia
Ocean Shores
Ellensburg
Bainbridge Island
Gig Harbor
Renton
Centralia
Kent
Edmonds
Federal Way
Shelton

Why use momondo?

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

It is quick and easy to find Toronto to Seattle flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Seattle that suits you.

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

Yes. All flights to Seattle from Toronto on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Toronto to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

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

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