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Region of Waterloo Intl

$132+ 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 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YKF
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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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 September 16, 2025.

Round-trip from

$257
(oojo)

One-way from

$132
(Trip.com)

Popular in

June

Cheapest in

January

Average price

$411
From Seattle/Tacoma Intl to Toronto Region of Waterloo Intl
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One-way flight from Seattle/Tacoma Intl to Toronto Region of Waterloo Intl
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Highest demand for flights based on searches. 15% potential increase in price ($70 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 16, 2025.

This oojo deal was found by Cheapflights users on 9/14. 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.
Fri 10/241:50 pmSEA - YKF
1 stop7h 55mWestJet
Tue 10/286:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 9/14$257
This Trip.com deal was found by Cheapflights users on 9/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/198:40 amSEA - YKF
1 stop13h 05mWestJet
Sat 11/16:20 amYKF - SEA
1 stop11h 18mWestJet
Deal found 9/14$265
This FlightHub deal was found by Cheapflights users on 9/15. 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.
Sun 11/93:10 pmSEA - YKF
1 stop11h 18mWestJet
Thu 11/136:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 9/15$276
This Mytrip deal was found by Cheapflights users on 9/16. 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 11/2811:55 amSEA - YKF
2 stops14h 33mWestJet
Mon 12/16:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 9/16$292
This Mytrip deal was found by Cheapflights users on 9/14. 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.
Sun 11/911:55 amSEA - YKF
2 stops14h 33mWestJet
Sat 11/156:20 amYKF - SEA
1 stop11h 18mWestJet
Deal found 9/14$294
This Mytrip deal was found by Cheapflights users on 9/15. 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.
Wed 10/18:40 amSEA - YKF
1 stop13h 05mMultiple Airlines
Fri 10/36:15 amYKF - SEA
1 stop9h 20mMultiple Airlines
Deal found 9/15$313
This Mytrip deal was found by Cheapflights users on 9/15. 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.
Fri 10/3111:55 amSEA - YKF
2 stops14h 33mWestJet
Mon 11/36:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 9/15$321
This Mytrip deal was found by Cheapflights users on 9/14. 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 11/73:10 pmSEA - YKF
1 stop11h 18mMultiple Airlines
Fri 11/147:05 amYKF - SEA
1 stop10h 15mMultiple Airlines
Deal found 9/14$322
This Mytrip deal was found by Cheapflights users on 9/14. 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.
Sat 10/111:50 pmSEA - YKF
2 stops12h 40mMultiple Airlines
Sun 10/196:15 amYKF - SEA
2 stops33h 44mMultiple Airlines
Deal found 9/14$324
This Mytrip deal was found by Cheapflights users on 9/14. 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.
Sun 10/263:10 pmSEA - YKF
1 stop11h 18mMultiple Airlines
Sun 11/27:05 amYKF - SEA
1 stop10h 15mMultiple Airlines
Deal found 9/14$328
This Mytrip deal was found by Cheapflights users on 9/16. 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 10/21:50 pmSEA - YKF
1 stop7h 55mMultiple Airlines
Sun 10/56:15 amYKF - SEA
1 stop9h 20mMultiple Airlines
Deal found 9/16$337

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 September 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

Fri 10/24

1:50 pm-12:45 am

1 stop7h 55m

Toronto Region of Waterloo Intl

Tue 10/28

6:20 am-2:20 pm

1 stop11h 00m

$257

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

$276

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 11/28

11:55 am-5:28 am

2 stops14h 33m

Toronto Region of Waterloo Intl

Mon 12/1

6:20 am-2:20 pm

1 stop11h 00m

$292

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 11/9

11:55 am-5:28 am

2 stops14h 33m

Toronto Region of Waterloo Intl

Sat 11/15

6:20 am-2:38 pm

1 stop11h 18m

$294

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 10/1

8:40 am-12:45 am

1 stop13h 05m

Toronto Region of Waterloo Intl

Fri 10/3

6:15 am-12:35 pm

1 stop9h 20m

$313

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 11/7

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Fri 11/14

7:05 am-2:20 pm

1 stop10h 15m

$322

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 10/11

1:50 pm-5:30 am

2 stops12h 40m

Toronto Region of Waterloo Intl

Sun 10/19

6:15 am-12:59 pm

2 stops33h 44m

$324

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 10/26

11:55 am-5:28 am

2 stops14h 33m

Toronto Region of Waterloo Intl

Sun 11/2

7:05 am-2:20 pm

1 stop10h 15m

$334

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 10/17

1:50 pm-5:15 am

1 stop12h 25m

Toronto Region of Waterloo Intl

Sun 10/19

6:15 am-12:59 pm

2 stops33h 44m

$345

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 10/29

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Sat 11/1

6:20 am-11:23 am

2 stops32h 03m

$358

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 20 results
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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 September 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.

  • 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 7h 55m. 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.

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