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$145+ Cheap flights from Region of Waterloo Intl (YKF) to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/17. Fares are subject to change and may not be available on all flights or dates of travel.
YKF — SEA
Mar 15 — Mar 221
Sun 3/15
Sun 3/22
1 adult, Economy
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Cheap flight deals from Region of Waterloo Intl to Seattle

Cheapest flights from Region of Waterloo Intl to Seattle
Explore the most affordable flight options available from Region of Waterloo Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 13, 2026.

This Trip.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/246:20 am
YKF
-
SEA
1 stop10h 59m
WestJet
Wed 3/43:10 pm
SEA
-
YKF
1 stop11h 19m
WestJet
Deal found 2/10$257
This oojo deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/258:40 pm
YKF
-
SEA
1 stop25h 05m
WestJet
Wed 6/37:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Deal found 2/11$264
This oojo deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/258:40 pm
YKF
-
SEA
1 stop25h 05m
WestJet
Tue 6/27:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Deal found 2/11$267
This oojo deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/298:40 pm
YKF
-
SEA
1 stop16h 00m
WestJet
Mon 6/17:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Deal found 2/11$271
This Trip.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:40 pm
YKF
-
SEA
1 stop16h 00m
WestJet
Sun 6/77:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Deal found 2/10$274
This Trip.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:20 am
YKF
-
SEA
1 stop10h 59m
WestJet
Mon 3/163:10 pm
SEA
-
YKF
1 stop11h 19m
WestJet
Deal found 2/12$288
This oojo deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/78:40 pm
YKF
-
SEA
1 stop16h 00m
WestJet
Sun 6/147:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Deal found 2/10$292
This oojo deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/246:20 am
YKF
-
SEA
1 stop10h 59m
WestJet
Sun 4/193:10 pm
SEA
-
YKF
1 stop11h 19m
WestJet
Deal found 2/10$313
This oojo deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/108:40 pm
YKF
-
SEA
1 stop16h 00m
WestJet
Thu 6/117:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Deal found 2/10$320
This Trip.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/108:40 pm
YKF
-
SEA
1 stop16h 00m
WestJet
Wed 6/177:00 am
SEA
-
YKF
1 stop9h 50m
WestJet
Deal found 2/10$322
This Trip.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/188:40 pm
YKF
-
SEA
1 stop16h 00m
WestJet
Mon 7/207:00 am
SEA
-
YKF
1 stop9h 50m
WestJet
Deal found 2/11$324

Find flight deals from Region of Waterloo Intl to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Region of Waterloo Intl (YKF) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$257
(Trip.com)

One-way from

$145
(oojo)

Popular in

June

Cheapest in

February

Average price

$257
Provider with most accurate pricing for Toronto Region of Waterloo Intl-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Toronto Region of Waterloo Intl-Seattle/Tacoma Intl flights.
Search Deals
From Toronto Region of Waterloo Intl to Seattle/Tacoma Intl
Search Deals
One-way flight from Toronto Region of Waterloo Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Region of Waterloo Intl 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, Cheapflights users made 2,558,603 searches. Data last updated February 13, 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

Region of Waterloo Intl

Fly to

Seattle

Route

Depart

Return

Price

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Mon 5/25

8:40 pm-6:45 pm

1 stop25h 05m

Seattle/Tacoma Intl

Tue 6/2

7:35 pm-7:50 pm

1 stop21h 15m

$267

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Fri 5/29

8:40 pm-6:45 pm

1 stop25h 05m

Seattle/Tacoma Intl

Mon 6/1

7:35 pm-7:50 pm

1 stop21h 15m

$271

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Tue 3/3

6:20 am-2:19 pm

1 stop10h 59m

Seattle/Tacoma Intl

Mon 3/16

3:10 pm-5:29 am

1 stop11h 19m

$288

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sun 6/7

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Sun 6/14

7:35 pm-7:50 pm

1 stop21h 15m

$292

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Tue 3/24

6:20 am-2:19 pm

1 stop10h 59m

Seattle/Tacoma Intl

Sun 4/19

3:10 pm-5:29 am

1 stop11h 19m

$313

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Wed 6/10

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Thu 6/11

7:35 pm-7:50 pm

1 stop21h 15m

$320

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sat 8/8

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Sat 8/15

7:00 am-7:50 pm

1 stop9h 50m

$320

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Wed 6/24

8:40 pm-6:45 pm

1 stop25h 05m

Seattle/Tacoma Intl

Sat 6/27

7:00 am-7:50 pm

1 stop9h 50m

$322

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Wed 6/10

8:40 pm-9:40 am

1 stop16h 00m

Seattle/Tacoma Intl

Wed 6/17

7:00 am-7:50 pm

1 stop9h 50m

$322

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Sun 8/2

8:40 pm-6:45 pm

1 stop25h 05m

Seattle/Tacoma Intl

Sun 8/9

7:00 am-7:50 pm

1 stop9h 50m

$324

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/10

Showing 1-10 of 19 results
1
2
  • Most accurate provider: When it comes to deals on Toronto Region of Waterloo Intl Airport-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Toronto Region of Waterloo Intl Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Toronto Region of Waterloo Intl Airport-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Toronto Region of Waterloo Intl Airport-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Toronto Region of Waterloo Intl Airport-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Region of Waterloo Intl to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Region of Waterloo Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Region of Waterloo Intl to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from Toronto Region of Waterloo Intl?

    For a flight from Toronto Region of Waterloo Intl to Seattle, you will be flying into Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city. Seattle/Tacoma Intl is the only Seattle airport and it handles 0 inbound flights from Toronto Region of Waterloo Intl per day. 0 airlines have flights to Seattle/Tacoma Intl from Toronto Region of Waterloo Intl on a regular basis.

  • How long is the flight from Toronto Region of Waterloo Intl Airport to Seattle?

    For as low as $257, WestJet can have you in Seattle from Toronto Region of Waterloo Intl Airport in 10h 59m. There are 2024 mi between Toronto Region of Waterloo Intl Airport and Seattle.

  • Can I find deals for flights from Region of Waterloo Intl to Seattle that include hotel bookings?

    Yes. In addition to deals on Region of Waterloo Intl to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Region of Waterloo Intl to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Region of Waterloo Intl to Seattle.

  • Can I find deals for business class flights from Region of Waterloo Intl to Seattle?

    Yes. Cheapflights offers flight deals from Region of Waterloo Intl to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
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Alternative routes for Region of Waterloo Intl to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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