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Cheap flights from Seattle to Toronto Region of Waterloo Intl Airport from C$ 162

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 20/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YKF
11 Oct — 18 Oct1
1 adult
1 adult, Economy

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 11 September 2025.

Round-trip from

C$ 356

One-way from

C$ 162

Popular in

June

Cheapest in

January

Average price

C$ 565
WestJet
  • WestJet
  • 28/11-1/12
  • 2 total stops
  • 22h 18m total
  • Seattle to Toronto
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20/10
  • 20/10
  • 1 total stop
  • 17h 35m total
  • Seattle to Toronto
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Highest demand for flights based on searches. 13% potential increase in price (C$ 124 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 17 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 11 September 2025.

Fri 28/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Mon 1/126:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 10/9C$ 356
Wed 1/101:50 p.m.SEA - YKF
1 stop7h 55mWestJet
Mon 6/106:00 a.m.YKF - SEA
1 stop17h 29mWestJet
Deal found 9/9C$ 359
Mon 3/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Sat 15/116:20 a.m.YKF - SEA
1 stop11h 18mWestJet
Deal found 9/9C$ 363
Sun 9/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Thu 13/116:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 11/9C$ 366
Mon 20/108:40 a.m.SEA - YKF
1 stop17h 35mMultiple Airlines
Thu 23/106:00 a.m.YKF - SEA
1 stop9h 59mMultiple Airlines
Deal found 11/9C$ 388
Fri 21/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Mon 24/116:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 10/9C$ 398
Wed 24/91:50 p.m.SEA - YKF
1 stop7h 55mMultiple Airlines
Sun 28/96:15 a.m.YKF - SEA
1 stop9h 20mMultiple Airlines
Deal found 9/9C$ 403
Thu 25/98:40 a.m.SEA - YKF
1 stop13h 05mWestJet
Mon 29/96:00 a.m.YKF - SEA
1 stop17h 29mWestJet
Deal found 9/9C$ 410
Fri 10/101:50 p.m.SEA - YKF
1 stop7h 55mWestJet
Mon 13/106:00 a.m.YKF - SEA
1 stop17h 29mWestJet
Deal found 10/9C$ 418
Wed 26/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Mon 1/126:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 11/9C$ 423
Wed 1/108:40 a.m.SEA - YKF
1 stop13h 05mWestJet
Mon 13/106:00 a.m.YKF - SEA
1 stop17h 29mWestJet
Deal found 10/9C$ 430
Sun 19/108:40 a.m.SEA - YKF
1 stop13h 05mWestJet
Sat 1/116:20 a.m.YKF - SEA
1 stop11h 18mWestJet
Deal found 11/9C$ 431

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 629,999 searches. Data last updated 11 September 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 28/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 1/12

6:20 a.m.-2:20 p.m.

1 stop11h 00m

C$ 356

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 3/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 17/11

6:20 a.m.-2:20 p.m.

1 stop11h 00m

C$ 363

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 5/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 17/11

6:20 a.m.-2:20 p.m.

1 stop11h 00m

C$ 363

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 3/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Sat 15/11

6:20 a.m.-2:38 p.m.

1 stop11h 18m

C$ 363

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 9/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Thu 13/11

6:20 a.m.-2:20 p.m.

1 stop11h 00m

C$ 366

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 20/10

8:40 a.m.-5:15 a.m.

1 stop17h 35m

Toronto Region of Waterloo Intl

Thu 23/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

C$ 388

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 21/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 24/11

6:20 a.m.-2:20 p.m.

1 stop11h 00m

C$ 398

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 26/11

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 1/12

6:20 a.m.-2:20 p.m.

1 stop11h 00m

C$ 423

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 1/10

8:40 a.m.-12:45 a.m.

1 stop13h 05m

Toronto Region of Waterloo Intl

Mon 13/10

6:00 a.m.-8:29 p.m.

1 stop17h 29m

C$ 430

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 19/10

8:40 a.m.-5:15 a.m.

1 stop17h 35m

Toronto Region of Waterloo Intl

Wed 22/10

6:30 a.m.-7:21 p.m.

2 stops15h 51m

C$ 432

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/9

Showing 1-10 of 21 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.

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?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Toronto Region of Waterloo Intl. On average, Seattle/Tacoma Intl has 0 outbound flights to Toronto Region of Waterloo Intl per day from 0 airlines. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.

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

    For as low as C$ 356, WestJet can have you in Toronto Region of Waterloo Intl Airport from Seattle in 11h 18m. Seattle and Toronto Region of Waterloo Intl Airport are separated by a distance of 3257 km.

  • 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.

  • What is the cheapest month to book a flight from Seattle to Toronto Region of Waterloo Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Toronto Region of Waterloo Intl Airport (average of C$ 114). Flying from Seattle to Toronto Region of Waterloo Intl Airport in December is currently the most expensive (average of C$ 246). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Toronto Region of Waterloo Intl Airport?

Book flights to Toronto Region of Waterloo Intl Airport if you plan to visit one of these locations
Southampton
Sauble Beach

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Region of Waterloo Intl

See prices for flight routes from nearby airports that may be better suited for you.
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How does Cheapflights help users find flights from Seattle to Region of Waterloo Intl?

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Can Cheapflights find flights from Seattle to Region of Waterloo Intl with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Seattle to Region of Waterloo Intl, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Seattle to Region of Waterloo Intl become cheaper?

Yes! Start tracking prices for Seattle to Region of Waterloo Intl flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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