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Cheap flights from Toronto Region of Waterloo Intl Airport to Seattle from C$ 237

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 18/11. 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

Enter your travel dates to find the best prices.
WestJet Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 340WestJet
Find Deal
sáb., 25 oct. - dom., 2 nov.
WestJet Logo
6:20 a.m. - 2:20 p.m.YKF-SEA
11h 00m1 stop
WestJet Logo
3:15 p.m. - 5:28 a.m.SEA-YKF
11h 13m1 stop
C$ 349WestJet
Find Deal
lun., 1 dic. - mié., 3 dic.
WestJet Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 379WestJet
Find Deal
sáb., 25 oct. - mié., 29 oct.
Multiple Airlines Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
Multiple Airlines Logo
11:55 a.m. - 4:00 p.m.SEA-YKF
25h 05m2 stops
C$ 413Multiple Airlines
Find Deal
sáb., 25 oct. - lun., 27 oct.
Multiple Airlines Logo
7:05 a.m. - 2:20 p.m.YKF-SEA
10h 15m1 stop
Multiple Airlines Logo
11:55 a.m. - 5:28 a.m.SEA-YKF
14h 33m2 stops
C$ 414Multiple Airlines
Find Deal
dom., 23 nov. - dom., 30 nov.
Multiple Airlines Logo
7:05 a.m. - 2:20 p.m.YKF-SEA
10h 15m1 stop
Multiple Airlines Logo
11:55 a.m. - 5:28 a.m.SEA-YKF
14h 33m3 stops
C$ 423Multiple Airlines
Find Deal
dom., 23 nov. - dom., 30 nov.
WestJet Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 427WestJet
Find Deal
sáb., 25 oct. - dom., 2 nov.
Multiple Airlines Logo
7:05 a.m. - 2:20 p.m.YKF-SEA
10h 15m1 stop
Multiple Airlines Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 428Multiple Airlines
Find Deal
dom., 23 nov. - dom., 30 nov.
WestJet Logo
6:20 a.m. - 2:20 p.m.YKF-SEA
11h 00m1 stop
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 435WestJet
Find Deal
mar., 11 nov. - vie., 14 nov.
WestJet Logo
6:20 a.m. - 2:20 p.m.YKF-SEA
11h 00m1 stop
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 444WestJet
Find Deal
lun., 8 dic. - lun., 15 dic.

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
25 Oct
YKF6:00 a.m.Toronto Region of Waterloo Intl
9h 59m
1 stop
SEA12:59 p.m.Seattle/Tacoma Intl
2 Nov
SEA3:10 p.m.Seattle/Tacoma Intl
11h 18m
1 stop
YKF5:28 a.m.Toronto Region of Waterloo Intl
C$ 340
Find similar
WestJet
1 Dec
YKF6:20 a.m.Toronto Region of Waterloo Intl
11h 00m
1 stop
SEA2:20 p.m.Seattle/Tacoma Intl
3 Dec
SEA3:15 p.m.Seattle/Tacoma Intl
11h 13m
1 stop
YKF5:28 a.m.Toronto Region of Waterloo Intl
C$ 349
Find similar
WestJet
25 Oct
YKF6:00 a.m.Toronto Region of Waterloo Intl
9h 59m
1 stop
SEA12:59 p.m.Seattle/Tacoma Intl
29 Oct
SEA3:10 p.m.Seattle/Tacoma Intl
11h 18m
1 stop
YKF5:28 a.m.Toronto Region of Waterloo Intl
C$ 379
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 13 octubre 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

sáb. 25/10

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

1 stop9h 59m

Seattle/Tacoma Intl

dom. 2/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

C$ 340

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

lun. 1/12

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

1 stop11h 00m

Seattle/Tacoma Intl

mié. 3/12

3:15 p.m.-5:28 a.m.

1 stop11h 13m

C$ 349

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

sáb. 25/10

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

1 stop9h 59m

Seattle/Tacoma Intl

mié. 29/10

3:10 p.m.-5:28 a.m.

1 stop11h 18m

C$ 379

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

sáb. 25/10

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

1 stop9h 59m

Seattle/Tacoma Intl

lun. 27/10

11:55 a.m.-4:00 p.m.

2 stops25h 05m

C$ 413

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

dom. 23/11

7:05 a.m.-2:20 p.m.

1 stop10h 15m

Seattle/Tacoma Intl

dom. 30/11

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

2 stops14h 33m

C$ 414

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

dom. 23/11

7:05 a.m.-2:20 p.m.

1 stop10h 15m

Seattle/Tacoma Intl

dom. 30/11

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

3 stops14h 33m

C$ 423

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

sáb. 25/10

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

1 stop9h 59m

Seattle/Tacoma Intl

dom. 2/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

C$ 427

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

dom. 23/11

7:05 a.m.-2:20 p.m.

1 stop10h 15m

Seattle/Tacoma Intl

dom. 30/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

C$ 428

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

mar. 11/11

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

1 stop11h 00m

Seattle/Tacoma Intl

vie. 14/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

C$ 435

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

lun. 8/12

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

1 stop11h 00m

Seattle/Tacoma Intl

lun. 15/12

3:10 p.m.-5:28 a.m.

1 stop11h 18m

C$ 444

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$ 562. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 778. 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$ 440. Flights in the morning are often more expensive with an average ticket price of C$ 855.

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

Direct flights

None
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 9h 59m.

  • 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$ 185Free CancellationRating
7.2
3,124 reviews
Search WestJet flights
Air CanadaPriceFrom C$ 382Free CancellationRating
7.1
10,286 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
Lynnwood
Marysville
Tacoma
SeaTac
Kirkland
Redmond
Olympia
Ocean Shores
Shoreline
Ellensburg
Gig Harbor
Renton
Mukilteo
Cle Elum
Federal Way
Poulsbo
Puyallup
Shelton
Lakewood

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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