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Cheap flights from Seattle to Toronto Region of Waterloo Intl Airport from C$ 185

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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YKF
27 Nov — 4 Dec1
1 adult
1 adult, Economy, 0 bags

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 28 October 2025.

Round-trip from

C$ 392

One-way from

C$ 185

Popular in

June

Cheapest in

January

Average price

C$ 618
WestJet
  • WestJet
  • 5/4-9/4
  • 2 total stops
  • 22h 18m total
  • Seattle to Toronto
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WestJet
  • WestJet
  • 11/3
  • 1 total stop
  • 11h 19m total
  • Seattle to Toronto
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Highest demand for flights based on searches. 14% potential increase in price (C$ 130 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 28 October 2025.

Sun 23/1111:55 a.m.SEA - YKF
2 stops14h 33mMultiple Airlines
Sun 30/117:05 a.m.YKF - SEA
2 stops30h 17mMultiple Airlines
Deal found 26/10C$ 557
Wed 3/123:15 p.m.SEA - YKF
1 stop11h 13mWestJet
Sat 6/126:20 a.m.YKF - SEA
1 stop11h 20mWestJet
Deal found 28/10C$ 583
Fri 21/1111:55 a.m.SEA - YKF
2 stops14h 33mMultiple Airlines
Sun 30/117:05 a.m.YKF - SEA
2 stops30h 17mMultiple Airlines
Deal found 26/10C$ 611
Fri 12/123:10 p.m.SEA - YKF
1 stop21h 50mMultiple Airlines
Fri 19/127:05 a.m.YKF - SEA
1 stop10h 15mMultiple Airlines
Deal found 28/10C$ 628
Fri 14/1111:55 a.m.SEA - YKF
2 stops25h 05mMultiple Airlines
Sun 16/117:05 a.m.YKF - SEA
1 stop10h 15mMultiple Airlines
Deal found 27/10C$ 639
Sun 23/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Thu 27/116:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 27/10C$ 676
Fri 14/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Thu 20/116:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 28/10C$ 688

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 28 October 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 5/4

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Thu 9/4

6:20 a.m.-2:19 p.m.

1 stop10h 59m

C$ 392

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 18/2

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 23/2

6:20 a.m.-2:19 p.m.

1 stop10h 59m

C$ 414

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 5/4

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Fri 10/4

7:05 a.m.-10:21 a.m.

2 stops30h 16m

C$ 448

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 9/1

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

1 stop11h 18m

Toronto Region of Waterloo Intl

Sun 11/1

7:05 a.m.-2:20 p.m.

1 stop10h 15m

C$ 467

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 11/1

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

2 stops14h 33m

Toronto Region of Waterloo Intl

Sat 17/1

7:00 p.m.-10:23 a.m.

2 stops18h 23m

C$ 504

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 23/11

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

2 stops14h 33m

Toronto Region of Waterloo Intl

Sun 30/11

7:05 a.m.-10:22 a.m.

2 stops30h 17m

C$ 557

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 30/1

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

1 stop11h 18m

Toronto Region of Waterloo Intl

Thu 12/2

6:20 a.m.-10:21 a.m.

2 stops31h 01m

C$ 573

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 11/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

C$ 185

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 8/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

C$ 194

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 9/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

C$ 194

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

Showing 1-10 of 17 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$ 392, WestJet can have you in Toronto Region of Waterloo Intl Airport from Seattle in 11h 19m. 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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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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