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Cheap flights from Seattle to Toronto Region of Waterloo Intl Airport from C$ 170

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 23/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YKF
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Region of Waterloo Intl

Enter your travel dates to find the best prices.

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 12 December 2025.

Fri 12/123:10 p.m.SEA - YKF
1 stop11h 18mMultiple Airlines
Sun 14/127:05 a.m.YKF - SEA
1 stop10h 15mMultiple Airlines
Deal found 11/12C$ 1,306
Thu 25/123:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Mon 5/16:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 11/12C$ 1,334
Thu 25/123:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Tue 30/126:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 10/12C$ 1,404
Sun 14/125:35 p.m.SEA - YKF
2 stops8h 53mWestJet
Thu 18/126:20 a.m.YKF - SEA
2 stops17h 30mWestJet
Deal found 11/12C$ 1,460
Fri 12/123:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Tue 16/126:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 9/12C$ 1,484
Fri 12/129:32 a.m.SEA - YKF
2 stops16h 56mWestJet
Mon 15/126:20 a.m.YKF - SEA
2 stops13h 26mWestJet
Deal found 9/12C$ 1,572
Wed 31/123:10 p.m.SEA - YKF
1 stop11h 18mMultiple Airlines
Mon 5/16:20 a.m.YKF - SEA
2 stops13h 49mMultiple Airlines
Deal found 10/12C$ 1,620
Fri 12/123:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Thu 18/126:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 10/12C$ 1,642
Mon 22/123:10 p.m.SEA - YKF
1 stop11h 18mMultiple Airlines
Thu 1/16:20 a.m.YKF - SEA
1 stop9h 03mMultiple Airlines
Deal found 11/12C$ 1,659
Thu 25/123:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Thu 1/16:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 11/12C$ 1,684

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 12 December 2025.

Round-trip from

C$ 348

One-way from

C$ 170

Popular in

December

Cheapest in

November

Average price

C$ 763
WestJet
  • WestJet
  • 12/5-19/5
  • 2 total stops
  • 24h 48m total
  • Seattle to Toronto
Search Deals
WestJet
  • WestJet
  • 23/1
  • 1 total stop
  • 11h 18m total
  • Seattle to Toronto
Search Deals
High demand for flights, 7% potential price rise
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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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 12 December 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

Sun 25/1

11:55 a.m.-5:28 a.m.

2 stops14h 33m

Toronto Region of Waterloo Intl

Sun 1/2

7:05 a.m.-2:19 p.m.

1 stop10h 14m

C$ 488

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 21/1

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

1 stop11h 18m

Toronto Region of Waterloo Intl

Sat 24/1

7:00 p.m.-10:22 a.m.

2 stops18h 22m

C$ 568

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 9/2

11:55 a.m.-5:29 a.m.

2 stops14h 34m

Toronto Region of Waterloo Intl

Fri 13/2

7:05 a.m.-10:25 a.m.

2 stops30h 20m

C$ 666

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 25/12

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

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 5/1

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

1 stop11h 00m

C$ 1,334

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 14/12

5:35 p.m.-5:28 a.m.

2 stops8h 53m

Toronto Region of Waterloo Intl

Thu 18/12

6:20 a.m.-8:50 p.m.

2 stops17h 30m

C$ 1,460

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 31/12

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

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 5/1

6:20 a.m.-5:09 p.m.

2 stops13h 49m

C$ 1,620

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 25/12

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

1 stop11h 18m

Toronto Region of Waterloo Intl

Thu 1/1

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

1 stop11h 00m

C$ 1,684

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 25/12

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

1 stop11h 18m

Toronto Region of Waterloo Intl

Tue 30/12

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

1 stop11h 00m

C$ 1,706

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 23/1

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

1 stop11h 18m

C$ 170

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 15/2

5:50 a.m.-5:29 a.m.

2 stops20h 39m

C$ 313

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 13 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$ 568, 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.

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

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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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Portland to Pearson Intl flights
Seattle to Hamilton flights
Bellingham to Pearson Intl flights
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Pasco to Pearson Intl flights

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How does Cheapflights help users find flights from Seattle to Region of Waterloo Intl?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Seattle to Region of Waterloo Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Region of Waterloo Intl?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Region of Waterloo Intl for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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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