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

$123+ 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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YKF
Aug 21 — Aug 281
Thu 8/21
Thu 8/28
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

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 August 16, 2025.

Round-trip from

$281
(oojo)

One-way from

$123
(Trip.com)

Popular in

June

Cheapest in

January

Average price

$471
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. 13% potential increase in price ($64 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 August 2025
Search Deals

Find 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 August 16, 2025.

This oojo deal was found by Cheapflights users on 8/14. 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 9/101:50 pmSEA - YKF
1 stop7h 55mWestJet
Thu 9/116:00 amYKF - SEA
1 stop9h 59mWestJet
Deal found 8/14$285
This oojo deal was found by Cheapflights users on 8/15. 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 9/111:50 pmSEA - YKF
1 stop7h 55mWestJet
Mon 9/156:00 amYKF - SEA
1 stop17h 29mWestJet
Deal found 8/15$297
This oojo deal was found by Cheapflights users on 8/15. 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 11/93:10 pmSEA - YKF
1 stop11h 18mWestJet
Thu 11/136:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 8/15$301
This Mytrip deal was found by Cheapflights users on 8/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/31:50 pmSEA - YKF
1 stop12h 25mMultiple Airlines
Mon 10/66:00 amYKF - SEA
1 stop17h 29mMultiple Airlines
Deal found 8/14$302
This FlightHub deal was found by Cheapflights users on 8/15. 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.
Thu 10/21:50 pmSEA - YKF
1 stop7h 55mWestJet
Tue 10/76:00 amYKF - SEA
1 stop9h 59mWestJet
Deal found 8/15$313
This Mytrip deal was found by Cheapflights users on 8/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/111:50 pmSEA - YKF
2 stops12h 40mMultiple Airlines
Mon 9/156:00 amYKF - SEA
1 stop17h 29mMultiple Airlines
Deal found 8/15$322
This TeaFlight deal was found by Cheapflights users on 8/15. 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 TeaFlight is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/298:40 amSEA - YKF
1 stop13h 05mWestJet
Mon 10/66:00 amYKF - SEA
1 stop17h 29mWestJet
Deal found 8/15$324
This Justfly.com deal was found by Cheapflights users on 8/15. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/212:05 pmSEA - YKF
1 stop7h 40mWestJet
Tue 9/306:00 amYKF - SEA
1 stop9h 59mWestJet
Deal found 8/15$328
This Mytrip deal was found by Cheapflights users on 8/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/138:40 amSEA - YKF
2 stops17h 50mMultiple Airlines
Sat 9/206:00 amYKF - SEA
1 stop16h 21mMultiple Airlines
Deal found 8/15$335
This Mytrip deal was found by Cheapflights users on 8/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/51:15 pmSEA - YKF
1 stop13h 15mMultiple Airlines
Sun 9/76:15 amYKF - SEA
1 stop9h 20mMultiple Airlines
Deal found 8/13$336
This FlightHub deal was found by Cheapflights users on 8/13. 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.
Fri 9/51:50 pmSEA - YKF
1 stop7h 55mWestJet
Mon 9/86:00 amYKF - SEA
1 stop17h 29mWestJet
Deal found 8/13$339

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 August 16, 2025.
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

Wed 9/10

1:50 pm-12:45 am

1 stop7h 55m

Toronto Region of Waterloo Intl

Thu 9/11

6:00 am-12:59 pm

1 stop9h 59m

$285

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 9/28

8:40 am-12:45 am

1 stop13h 05m

Toronto Region of Waterloo Intl

Fri 10/3

6:00 am-12:59 pm

1 stop9h 59m

$297

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 9/11

1:50 pm-12:45 am

1 stop7h 55m

Toronto Region of Waterloo Intl

Mon 9/15

6:00 am-8:29 pm

1 stop17h 29m

$297

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 11/9

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Thu 11/13

6:20 am-2:20 pm

1 stop11h 00m

$301

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 10/3

1:50 pm-5:15 am

1 stop12h 25m

Toronto Region of Waterloo Intl

Mon 10/6

6:00 am-8:29 pm

1 stop17h 29m

$302

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 10/2

1:50 pm-12:45 am

1 stop7h 55m

Toronto Region of Waterloo Intl

Tue 10/7

6:00 am-12:59 pm

1 stop9h 59m

$313

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 9/11

1:50 pm-5:30 am

2 stops12h 40m

Toronto Region of Waterloo Intl

Mon 9/15

6:00 am-8:29 pm

1 stop17h 29m

$322

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 9/29

8:40 am-12:45 am

1 stop13h 05m

Toronto Region of Waterloo Intl

Mon 10/6

6:00 am-8:29 pm

1 stop17h 29m

$324

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 9/21

2:05 pm-12:45 am

1 stop7h 40m

Toronto Region of Waterloo Intl

Tue 9/30

6:00 am-12:59 pm

1 stop9h 59m

$328

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 9/13

8:40 am-5:30 am

2 stops17h 50m

Toronto Region of Waterloo Intl

Sat 9/20

6:00 am-7:21 pm

1 stop16h 21m

$335

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 19 results
1
2

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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Toronto Region of Waterloo Intl Airport

What is the cheapest time of day to fly from SEA to YKF?

Find hourly flight availability from Seattle to Region of Waterloo Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 16, 2025.

One of the essential ways to save on airfare from Seattle to Toronto Region of Waterloo Intl Airport is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 30% on airfare.

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.

  • 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.