What is the cheapest airline that flies from Toronto Region of Waterloo Intl to Seattle/Tacoma Intl?

WestJet is the most popular carrier operating from Toronto Region of Waterloo Intl to Seattle/Tacoma Intl

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 refreshed on a daily basis.

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

The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$145 Cheap Flights from Toronto Region of Waterloo Intl Airport to Seattle in 2026

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:40 pm - 6:45 pm

YKF

SEA

25h 05m

1 stop

7:35 pm - 7:50 pm

SEA

YKF

21h 15m

1 stop

$236WestJet

Sun, May 10 - Sat, May 23

8:40 pm - 9:40 am

YKF

SEA

16h 00m

1 stop

7:35 pm - 7:50 pm

SEA

YKF

21h 15m

1 stop

$239WestJet

Wed, May 20 - Tue, Jun 2

7:00 pm - 2:19 pm

YKF

SEA

22h 19m

1 stop

3:10 pm - 5:29 am

SEA

YKF

11h 19m

1 stop

$241WestJet

Sat, Apr 11 - Wed, Apr 15

8:40 pm - 6:45 pm

YKF

SEA

25h 05m

1 stop

7:35 pm - 7:50 pm

SEA

YKF

21h 15m

1 stop

$247WestJet

Fri, May 8 - Tue, May 12

8:40 pm - 6:45 pm

YKF

SEA

25h 05m

1 stop

7:35 pm - 7:50 pm

SEA

YKF

21h 15m

1 stop

$249WestJet

Fri, May 22 - Thu, May 28

8:40 pm - 9:40 am

YKF

SEA

16h 00m

1 stop

7:35 pm - 7:50 pm

SEA

YKF

21h 15m

1 stop

$254WestJet

Thu, Jun 4 - Tue, Jun 9

8:40 pm - 9:40 am

YKF

SEA

16h 00m

1 stop

7:35 pm - 7:50 pm

SEA

YKF

21h 15m

1 stop

$255WestJet

Mon, Apr 27 - Thu, Apr 30

8:40 pm - 9:00 pm

YKF

SEA

27h 20m

1 stop

7:00 am - 7:50 pm

SEA

YKF

9h 50m

1 stop

$256WestJet

Sun, Jun 14 - Sat, Jun 20

8:40 pm - 9:40 am

YKF

SEA

16h 00m

1 stop

7:00 am - 7:50 pm

SEA

YKF

9h 50m

1 stop

$265WestJet

Thu, Jun 4 - Tue, Jun 23

8:40 pm - 9:40 am

YKF

SEA

16h 00m

1 stop

7:35 pm - 7:50 pm

SEA

YKF

21h 15m

1 stop

$281WestJet

Fri, May 1 - Tue, May 5

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

May 10

YKF8:40 pmToronto Region of Waterloo Intl

25h 05m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

May 23

SEA7:35 pmSeattle/Tacoma Intl

21h 15m

1 stop

YKF7:50 pmToronto Region of Waterloo Intl

$236

WestJet

May 20

YKF8:40 pmToronto Region of Waterloo Intl

16h 00m

1 stop

SEA9:40 amSeattle/Tacoma Intl

Jun 2

SEA7:35 pmSeattle/Tacoma Intl

21h 15m

1 stop

YKF7:50 pmToronto Region of Waterloo Intl

$239

WestJet

Apr 11

YKF7:00 pmToronto Region of Waterloo Intl

22h 19m

1 stop

SEA2:19 pmSeattle/Tacoma Intl

Apr 15

SEA3:10 pmSeattle/Tacoma Intl

11h 19m

1 stop

YKF5:29 amToronto Region of Waterloo Intl

$241

momondo Fare Finder

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 5/10

8:40 pm-6:45 pm

1 stop25h 05m

Seattle/Tacoma Intl

Sat 5/23

7:35 pm-7:50 pm

1 stop21h 15m

$236

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Wed 5/20

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Tue 6/2

7:35 pm-7:50 pm

1 stop21h 15m

$239

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sat 4/11

7:00 pm-2:19 pm

1 stop22h 19m

Seattle/Tacoma Intl

Wed 4/15

3:10 pm-5:29 am

1 stop11h 19m

$241

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Fri 5/8

8:40 pm-6:45 pm

1 stop25h 05m

Seattle/Tacoma Intl

Tue 5/12

7:35 pm-7:50 pm

1 stop21h 15m

$247

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Fri 5/22

8:40 pm-6:45 pm

1 stop25h 05m

Seattle/Tacoma Intl

Thu 5/28

7:35 pm-7:50 pm

1 stop21h 15m

$249

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 6/4

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Tue 6/9

7:35 pm-7:50 pm

1 stop21h 15m

$254

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Mon 4/27

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Thu 4/30

7:35 pm-7:50 pm

1 stop21h 15m

$255

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sun 6/14

8:40 pm-9:00 pm

1 stop27h 20m

Seattle/Tacoma Intl

Sat 6/20

7:00 am-7:50 pm

1 stop9h 50m

$256

Quickest round-trip

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 6/4

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Tue 6/23

7:00 am-7:50 pm

1 stop9h 50m

$265

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Fri 5/1

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Tue 5/5

7:35 pm-7:50 pm

1 stop21h 15m

$281

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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

On average, the least expensive day to fly to Seattle from Toronto Region of Waterloo Intl Airport is on a Thursday. momondo users have found tickets for Thursday departures for as low as $391. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Toronto Region of Waterloo Intl Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $519.

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

Flying to Seattle from Toronto Region of Waterloo Intl Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $404 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $547. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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?
Seattle/Tacoma Intl is 2024.0 mi away from Toronto Region of Waterloo Intl. A reasonable flight in good conditions will take 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 refreshed on a daily basis.
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 you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Redmond

Marysville

Puyallup

Cle Elum

Lakewood

Tukwila

Federal Way

Centralia

Fife

Westport

Kirkland

Tumwater

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. momondo allows you to filter the results for Toronto to Seattle flights to just show those with flexible booking policies.

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

Once you have performed a search for Toronto to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes momondo offers price alerts on flights to Seattle from Toronto. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.