HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Region of Waterloo Intl

$143+ Cheap flights from Seattle (SEA) to Region of Waterloo Intl (YKF)

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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YKF
Mar 12 — Mar 191
Thu 3/12
Thu 3/19
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Region of Waterloo Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Seattle to Region of Waterloo Intl

Cheapest flights from Seattle to Region of Waterloo Intl
Explore the most affordable flight options available from Seattle to Region of Waterloo Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 10, 2026.

This oojo deal was found by Cheapflights users on 2/9. 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 5/127:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Sun 5/178:40 pm
YKF
-
SEA
1 stop25h 05m
WestJet
Deal found 2/9$304
This FlightHub deal was found by Cheapflights users on 2/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/83:10 pm
SEA
-
YKF
1 stop11h 19m
WestJet
Sat 4/117:00 pm
YKF
-
SEA
1 stop22h 19m
WestJet
Deal found 2/9$349
This oojo deal was found by Cheapflights users on 2/9. 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.
Thu 6/47:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Mon 6/228:40 pm
YKF
-
SEA
1 stop25h 05m
WestJet
Deal found 2/9$352
This Trip.com deal was found by Cheapflights users on 2/9. 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.
Mon 3/93:10 pm
SEA
-
YKF
1 stop11h 19m
WestJet
Tue 3/176:20 am
YKF
-
SEA
1 stop10h 59m
WestJet
Deal found 2/9$354
This oojo deal was found by Cheapflights users on 2/7. 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.
Thu 6/47:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Thu 6/118:40 pm
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 2/7$358
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.
Fri 4/243:10 pm
SEA
-
YKF
1 stop11h 19m
WestJet
Sun 4/268:40 pm
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 2/10$361
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.
Fri 6/127:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Fri 6/198:40 pm
YKF
-
SEA
1 stop25h 05m
WestJet
Deal found 2/10$366
This oojo deal was found by Cheapflights users on 2/9. 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 4/173:10 pm
SEA
-
YKF
1 stop11h 19m
WestJet
Tue 4/216:20 am
YKF
-
SEA
1 stop10h 59m
WestJet
Deal found 2/9$368
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.
Thu 6/187:35 pm
SEA
-
YKF
1 stop21h 15m
WestJet
Mon 6/228:40 pm
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 2/10$378

Find flight deals from Seattle to Region of Waterloo Intl

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Region of Waterloo Intl (YKF). 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 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$304
(oojo)

One-way from

$143
(Trip.com)

Popular in

June

Cheapest in

January

Average price

$327
Provider with most accurate pricing for Seattle/Tacoma Intl-Toronto Region of Waterloo Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Toronto Region of Waterloo Intl flights.
Search Deals
From Seattle/Tacoma Intl to Toronto Region of Waterloo Intl
Search Deals
One-way flight from Seattle/Tacoma Intl to Toronto Region of Waterloo Intl
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($71 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 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 Seattle to Region of Waterloo Intl 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 10, 2026.
Use the filters below to find and compare flights from Seattle to Toronto Region of Waterloo Intl Airport that are best for you.

Fly from

Seattle

Fly to

Region of Waterloo Intl

Route

Depart

Return

Price

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 5/12

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 5/17

8:40 pm-6:45 pm

1 stop25h 05m

$304

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 4/30

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 5/3

8:40 pm-6:45 pm

1 stop25h 05m

$314

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 5/14

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 5/17

8:40 pm-6:45 pm

1 stop25h 05m

$314

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 5/9

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 5/17

8:40 pm-6:45 pm

1 stop25h 05m

$314

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 4/8

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Sat 4/11

7:00 pm-2:19 pm

1 stop22h 19m

$349

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 3/9

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Tue 3/17

6:20 am-2:19 pm

1 stop10h 59m

$354

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 4/24

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Sun 4/26

8:40 pm-9:40 am

1 stop16h 00m

$361

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 6/18

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 6/22

8:40 pm-9:40 am

1 stop16h 00m

$378

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 6/24

7:00 am-7:50 pm

1 stop9h 50m

Toronto Region of Waterloo Intl

Sun 6/28

8:40 pm-6:45 pm

1 stop25h 05m

$378

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 4/24

3:10 pm-5:29 am

1 stop11h 19m

$143

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/8

Showing 1-10 of 20 results
1
2

Compare providers for flights from Seattle to Region of Waterloo Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Region of Waterloo Intl in February.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Toronto Region of Waterloo Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Toronto Region of Waterloo Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Toronto Region of Waterloo Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Toronto Region of Waterloo Intl Airport 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 Seattle-Toronto Region of Waterloo Intl Airport 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 Seattle to Region of Waterloo Intl

Have a flexible travel schedule? Discover the best time to fly to Region of Waterloo Intl from Seattle 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 Seattle to Region of Waterloo Intl. 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 from for flights from Seattle to Toronto Region of Waterloo Intl?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly out of when you book flights from Seattle to Toronto Region of Waterloo Intl. 0 airlines have flights from Seattle/Tacoma Intl to Toronto Region of Waterloo Intl on a regular basis. Booking flights from Seattle/Tacoma Intl to Toronto Region of Waterloo Intl should not be difficult; the airport handles an average of 0 outbound flights to Toronto Region of Waterloo Intl per day.

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

    Airlines like WestJet fly from Seattle to Toronto Region of Waterloo Intl Airport in about 21h 15m. The time it takes to get you to your destination can typically vary by up to . The distance between Seattle and Toronto Region of Waterloo Intl Airport is about 2024 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Region of Waterloo Intl 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.