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Cheap flights from Ontario to Seattle from C$ 194

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 30/4. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
16 Apr — 23 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Ontario to Seattle
Explore the most affordable flight options available from Ontario to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 March 2026.

Thu 30/47:30 p.m.
YYZ
-
SEA
Nonstop5h 23m
Air Canada
Thu 7/57:20 p.m.
SEA
-
YYZ
2 stops9h 50m
Air Canada
Deal found 16/3C$ 303
Wed 29/48:00 a.m.
YYZ
-
SEA
1 stop14h 20m
Air Canada
Wed 6/52:55 p.m.
SEA
-
YYZ
1 stop7h 43m
Air Canada
Deal found 15/3C$ 329
Wed 22/48:15 a.m.
YYZ
-
SEA
2 stops9h 50m
Air Canada
Thu 23/43:45 p.m.
SEA
-
YYZ
2 stops10h 44m
Air Canada
Deal found 12/3C$ 340
Sat 9/58:00 a.m.
YYZ
-
SEA
2 stops13h 30m
Air Canada
Tue 19/57:20 p.m.
SEA
-
YYZ
2 stops9h 50m
Air Canada
Deal found 13/3C$ 342
Wed 6/512:30 a.m.
YYZ
-
SEA
2 stops12h 20m
Air Canada
Wed 20/57:20 p.m.
SEA
-
YYZ
2 stops11h 50m
Air Canada
Deal found 13/3C$ 355
Thu 23/47:30 p.m.
YYZ
-
SEA
Nonstop5h 23m
Air Canada
Wed 6/52:55 p.m.
SEA
-
YYZ
1 stop7h 43m
Air Canada
Deal found 14/3C$ 359
Fri 24/46:55 a.m.
YYZ
-
SEA
1 stop15h 25m
Air Canada
Sat 2/57:20 p.m.
SEA
-
YYZ
1 stop10h 43m
Air Canada
Deal found 16/3C$ 363
Wed 22/47:45 a.m.
YYZ
-
SEA
1 stop9h 34m
WestJet
Thu 23/43:10 p.m.
SEA
-
YYZ
2 stops11h 48m
WestJet
Deal found 13/3C$ 366
Tue 28/46:55 p.m.
YTZ
-
SEA
2 stops23h 10m
Air Canada
Wed 29/48:00 p.m.
SEA
-
YTZ
2 stops11h 25m
Air Canada
Deal found 12/3C$ 378
Sat 25/47:30 a.m.
YUL
-
SEA
1 stop10h 01m
WestJet
Fri 1/57:35 p.m.
SEA
-
YUL
1 stop8h 30m
WestJet
Deal found 13/3C$ 385
Fri 1/58:55 p.m.
YTZ
-
SEA
2 stops15h 55m
Air Canada
Sat 9/57:20 p.m.
SEA
-
YTZ
2 stops12h 07m
Air Canada
Deal found 14/3C$ 386
Mon 27/41:20 p.m.
YOW
-
SEA
1 stop8h 25m
WestJet
Mon 4/57:35 p.m.
SEA
-
YOW
1 stop7h 00m
WestJet
Deal found 13/3C$ 398

Find flight deals from Ontario to Seattle

Keep the following information in mind while searching for Ontario to Seattle flight deals. Data was last updated 17 March 2026.

Round-trip from

C$ 303

One-way from

C$ 194

Popular in

June

Cheapest in

February

Average price

C$ 456

Good round-trip deal

C$ 404 or less

Good one-way deal

C$ 283 or less
Air Canada
  • Air Canada
  • 30/4-7/5
  • 2 total stops
  • 15h 13m total
  • Ontario to Seattle
Search Deals
Air Canada
  • Air Canada
  • 30/4
  • 2 total stops
  • 10h 05m total
  • Ontario to Seattle
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from Ontario to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Seattle 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 17 March 2026.
Use the filters below to find and compare flights from Ontario to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 14/4

6:10 a.m.-10:32 a.m.

1 stop7h 22m

Seattle/Tacoma Intl

Sun 19/4

6:00 a.m.-5:21 p.m.

1 stop8h 21m

C$ 381

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 17/4

2:15 p.m.-9:50 p.m.

1 stop10h 35m

Seattle/Tacoma Intl

Mon 20/4

11:10 a.m.-9:59 p.m.

1 stop7h 49m

C$ 401

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 7/5

5:45 p.m.-12:12 a.m.

1 stop9h 27m

Seattle/Tacoma Intl

Sat 16/5

5:30 a.m.-5:21 p.m.

1 stop8h 51m

C$ 401

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 29/5

1:20 p.m.-6:45 p.m.

1 stop8h 25m

Seattle/Tacoma Intl

Mon 1/6

10:30 a.m.-12:20 a.m.

2 stops10h 50m

C$ 405

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Mon 13/4

2:15 p.m.-9:50 p.m.

1 stop10h 35m

Seattle/Tacoma Intl

Fri 17/4

11:59 p.m.-11:32 a.m.

1 stop8h 33m

C$ 405

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Tue 7/4

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

1 stop10h 59m

Seattle/Tacoma Intl

Wed 8/4

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

1 stop11h 19m

C$ 419

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 4/6

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Tue 23/6

7:00 a.m.-5:15 p.m.

1 stop7h 15m

C$ 424

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 1/5

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Mon 4/5

7:35 p.m.-5:15 p.m.

1 stop18h 40m

C$ 441

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Fri 1/5

6:10 p.m.-9:40 a.m.

1 stop18h 30m

Seattle/Tacoma Intl

Fri 8/5

10:30 a.m.-5:15 p.m.

1 stop27h 45m

C$ 444

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 30/4

9:30 a.m.-4:53 p.m.

1 stop10h 23m

Seattle/Tacoma Intl

Mon 4/5

11:15 p.m.-10:19 a.m.

1 stop8h 04m

C$ 446

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/3

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Ontario 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 Ontario to Seattle

What is the cheapest month to book a flight from Region of Ontario to Seattle?

Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Seattle (average of C$ 179). Flying from Region of Ontario to Seattle in July is currently the most expensive (average of C$ 323). 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.

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

Find hourly flight availability from Ontario to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 17 March 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Region of Ontario to Seattle as you normally would.

Weekly flight availability from Region of Ontario to Seattle

Explore weekly flight availability from Ontario to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 17 March 2026.

The most flights from CAON to SEA are scheduled on a Tuesday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

How much does it cost to fly round-trip from Region of Ontario to Seattle?

Related info for your journey

Find useful and relevant information for your journey from Ontario to Seattle. 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 into for flights to Seattle from Ontario?

    Located just 18.4 km from the city centre, Seattle/Tacoma Intl (SEA) is the airport most travelers will use when flying to Seattle from Ontario.

  • How long is the flight from Region of Ontario to Seattle?

    Departing from Region of Ontario to Seattle will take you 7h 22m. The distance from Region of Ontario to Seattle is about 3306 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from Region of Ontario to Seattle one-way?

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as C$ 120. Users have also found prices from C$ 152 and C$ 168 on Delta and Alaska Airlines, respectively.

  • What are the most popular routes from Region of Ontario to Seattle?

    The most popular route from Region of Ontario to Seattle is Toronto Pearson Intl - Seattle/Tacoma Intl. You may also consider Hamilton - Seattle/Tacoma Intl or Toronto Island - Seattle/Tacoma Intl.

  • What are the most reliable airlines from Region of Ontario to Seattle?

    No one likes to see their flight delayed. When booking a flight from Region of Ontario to Seattle consider choosing Air Tahiti Nui (80%), Qatar Airways (79%) or Alaska Airlines (75%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Region of Ontario to Seattle?

    Looking at all options, your cheapest flight can be booked for C$ 253. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 357 on average, our data indicates C$ 434 when flying from Region of Ontario to Seattle.

  • Can I find deals for flights from Ontario to Seattle that include hotel bookings?

    Yes. In addition to deals on Ontario to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Seattle.

  • Can I find deals for business class flights from Ontario to Seattle?

    Yes. Cheapflights offers flight deals from Ontario to Seattle 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 Region of Ontario to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Seattle (average of C$ 179). Flying from Region of Ontario to Seattle in July is currently the most expensive (average of C$ 323). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Leavenworth
Mukilteo
Tacoma
Kent
Bothell
Cashmere
Tukwila
Olympia
Renton
Marysville
Lynnwood
Kirkland

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Alternative routes for Ontario to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Ontario to Seattle

Discover the top 6 airlines that operate flights from Ontario to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 17 March 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 126AverageC$ 381FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 249AverageC$ 471FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapestC$ 251AverageC$ 486FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapestC$ 271AverageC$ 448FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 311AverageC$ 542FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Hawaiian AirlinesCheapestC$ 407AverageC$ 460FlexibilityNo cancel feeOn-time85%
Search Hawaiian Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Ontario to Seattle?

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Why should you use Cheapflights to find cheap flight tickets from Ontario to Seattle?

Millions of users choose and trust Cheapflights to book the best flight deals from Ontario to Seattle 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 Ontario to Seattle with no change fees?

Need flexible booking options for your flight to Seattle from Ontario? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Ontario to Seattle become cheaper?

Of course! You can now track prices for flights from Ontario to Seattle and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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