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Cheap flights from Toronto Region of Waterloo Intl Airport to Seattle from C$ 183

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 30/8. 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 Toronto Region of Waterloo Intl Airport to Seattle

Cheap round-trip flights

WestJet Logo
6:00 a.m. - 8:28 p.m.YKF-SEA
17h 28m1 stop
WestJet Logo
1:50 p.m. - 12:46 a.m.SEA-YKF
7h 56m1 stop
C$ 371WestJet
Find Deal
Sun, 24 Aug - Wed, 27 Aug
WestJet Logo
6:00 a.m. - 8:28 p.m.YKF-SEA
17h 28m1 stop
WestJet Logo
7:05 a.m. - 6:55 p.m.SEA-YKF
8h 50m1 stop
C$ 397WestJet
Find Deal
Sun, 24 Aug - Tue, 2 Sep
WestJet Logo
6:00 a.m. - 8:28 p.m.YKF-SEA
17h 28m1 stop
WestJet Logo
8:40 a.m. - 12:46 a.m.SEA-YKF
13h 06m1 stop
C$ 414WestJet
Find Deal
Fri, 29 Aug - Sun, 31 Aug
WestJet Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
WestJet Logo
1:50 p.m. - 12:45 a.m.SEA-YKF
7h 55m1 stop
C$ 429WestJet
Find Deal
Sun, 31 Aug - Fri, 5 Sep
WestJet Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
WestJet Logo
1:50 p.m. - 12:45 a.m.SEA-YKF
7h 55m1 stop
C$ 460WestJet
Find Deal
Mon, 8 Sep - Wed, 17 Sep
WestJet Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
WestJet Logo
7:05 a.m. - 6:55 p.m.SEA-YKF
8h 50m1 stop
C$ 477WestJet
Find Deal
Tue, 26 Aug - Tue, 2 Sep
WestJet Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
WestJet Logo
1:50 p.m. - 12:45 a.m.SEA-YKF
7h 55m1 stop
C$ 488WestJet
Find Deal
Tue, 9 Sep - Wed, 10 Sep
WestJet Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
WestJet Logo
1:50 p.m. - 12:45 a.m.SEA-YKF
7h 55m1 stop
C$ 489WestJet
Find Deal
Mon, 6 Oct - Fri, 10 Oct
Logo
6:30 a.m. - 8:29 p.m.YKF-SEA
16h 59m2 stops
Logo
1:50 p.m. - 12:45 a.m.SEA-YKF
7h 55m1 stop
C$ 567
Find Deal
Wed, 17 Sep - Wed, 24 Sep
Logo
6:00 a.m. - 7:14 p.m.YKF-SEA
16h 14m1 stop
Logo
2:05 p.m. - 5:15 a.m.SEA-YKF
12h 10m1 stop
C$ 571
Find Deal
Thu, 2 Oct - Mon, 20 Oct

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
24 Aug
YKF6:00 a.m.Toronto Region of Waterloo Intl
17h 28m
1 stop
SEA8:28 p.m.Seattle/Tacoma Intl
27 Aug
SEA1:50 p.m.Seattle/Tacoma Intl
7h 56m
1 stop
YKF12:46 a.m.Toronto Region of Waterloo Intl
C$ 371
Find similar
WestJet
24 Aug
YKF6:00 a.m.Toronto Region of Waterloo Intl
17h 28m
1 stop
SEA8:28 p.m.Seattle/Tacoma Intl
2 Sep
SEA7:05 a.m.Seattle/Tacoma Intl
8h 50m
1 stop
YKF6:55 p.m.Toronto Region of Waterloo Intl
C$ 397
Find similar
WestJet
29 Aug
YKF6:00 a.m.Toronto Region of Waterloo Intl
17h 28m
1 stop
SEA8:28 p.m.Seattle/Tacoma Intl
31 Aug
SEA8:40 a.m.Seattle/Tacoma Intl
13h 06m
1 stop
YKF12:46 a.m.Toronto Region of Waterloo Intl
C$ 414
Find similar

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 4 August 2025.
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

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sun 24/8

6:00 a.m.-8:28 p.m.

1 stop17h 28m

Seattle/Tacoma Intl

Wed 27/8

1:50 p.m.-12:46 a.m.

1 stop7h 56m

C$ 371

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sun 24/8

6:00 a.m.-8:28 p.m.

1 stop17h 28m

Seattle/Tacoma Intl

Tue 2/9

7:05 a.m.-6:55 p.m.

1 stop8h 50m

C$ 397

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Fri 29/8

6:00 a.m.-8:28 p.m.

1 stop17h 28m

Seattle/Tacoma Intl

Sun 31/8

8:40 a.m.-12:46 a.m.

1 stop13h 06m

C$ 414

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sun 31/8

6:00 a.m.-12:58 p.m.

1 stop9h 58m

Seattle/Tacoma Intl

Fri 5/9

1:50 p.m.-12:45 a.m.

1 stop7h 55m

C$ 429

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Mon 8/9

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Wed 17/9

1:50 p.m.-12:45 a.m.

1 stop7h 55m

C$ 460

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Tue 26/8

6:00 a.m.-12:58 p.m.

1 stop9h 58m

Seattle/Tacoma Intl

Tue 2/9

7:05 a.m.-6:55 p.m.

1 stop8h 50m

C$ 477

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Tue 9/9

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Wed 10/9

1:50 p.m.-12:45 a.m.

1 stop7h 55m

C$ 488

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Mon 6/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Fri 10/10

1:50 p.m.-12:45 a.m.

1 stop7h 55m

C$ 489

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Wed 17/9

6:30 a.m.-8:29 p.m.

2 stops16h 59m

Seattle/Tacoma Intl

Wed 24/9

1:50 p.m.-12:45 a.m.

1 stop7h 55m

C$ 567

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 2/10

6:00 a.m.-7:14 p.m.

1 stop16h 14m

Seattle/Tacoma Intl

Mon 20/10

2:05 p.m.-5:15 a.m.

1 stop12h 10m

C$ 571

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 Thursday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 561. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around C$ 734. 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$ 478. Flights in the morning are often more expensive with an average ticket price of C$ 825.

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

You could potentially save up to 34% 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

Best price found

C$ 183

Fastest flight time

9h 18m

Direct flights

None

Airports in Seattle

1 airport
The best one-way flight to Seattle from Toronto Region of Waterloo Intl Airport in the past 72 hours is C$ 183. The best round-trip flight deal from Toronto Region of Waterloo Intl Airport to Seattle found on momondo in the last 72 hours is C$ 371.
The fastest flight from Toronto Region of Waterloo Intl Airport to Seattle takes 9h 18m
There are no direct flights from Toronto Region of Waterloo Intl Airport to Seattle. Popular non-direct route for this connection is Toronto Region of Waterloo Intl Airport - Seattle/Tacoma Intl Airport.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
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 9h 58m.

  • 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$ 182Free CancellationRating
7.2
2,994 reviews
Search WestJet flights
Air CanadaPriceFrom C$ 376Free CancellationRating
7.1
9,879 reviews
Search Air Canada flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Marysville
Lynnwood
SeaTac
Tacoma
Ellensburg
Kirkland
Redmond
Olympia
Ocean Shores
Shoreline
Tukwila
Renton
Gig Harbor
Mukilteo
Cle Elum
Poulsbo
Puyallup
Kent
Centralia

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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