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Cheap flights from Ontario to Seattle from C$ 209

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 11/2. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
26 Jan — 2 Feb1
1 adult

Cheap flight deals from Ontario to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (CAON) to Seattle (SEA). 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 21 January 2025.

Round-trip from

C$ 341

One-way from

C$ 209

Good round-trip deal

C$ 380 or less

Good one-way deal

C$ 231 or less
21/3-24/3
  • 21/3-24/3
  • 2 total stops
  • 32h 31m total
  • Ontario to Seattle
Search Deals
11/2
  • 11/2
  • 2 total stops
  • 15h 19m total
  • Ontario to Seattle
Search Deals
Price to beat on a round-trip flight from Ontario to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Ontario to Seattle/Tacoma Intl.
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Find flight deals from Ontario to Seattle

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 21 January 2025.

Thu 1/58:00 a.m.YYZ - SEA
1 stop8h 08mWestJet
Sat 10/52:05 p.m.SEA - YYZ
2 stops12h 46mWestJet
Deal found 20/1C$ 337
Fri 21/38:00 p.m.YYZ - SEA
1 stop16h 30mMultiple Airlines
Mon 24/311:42 a.m.SEA - YYZ
1 stop16h 01mMultiple Airlines
Deal found 20/1C$ 341
Tue 11/24:20 p.m.YYZ - SEA
Nonstop5h 23mAlaska Airlines
Tue 18/27:18 a.m.SEA - YYZ
Nonstop4h 37mAlaska Airlines
Deal found 19/1C$ 347
Wed 26/36:15 a.m.YOW - SEA
1 stop11h 06mWestJet
Thu 27/311:30 a.m.SEA - YOW
2 stops10h 14mWestJet
Deal found 21/1C$ 348
Tue 4/37:05 p.m.YYZ - SEA
Nonstop5h 25mUnited Airlines
Wed 12/312:55 p.m.SEA - YYZ
1 stop8h 27mUnited Airlines
Deal found 20/1C$ 348
Thu 1/512:25 p.m.YTZ - SEA
1 stop10h 12mAir Canada
Fri 9/57:20 a.m.SEA - YTZ
1 stop9h 30mAir Canada
Deal found 20/1C$ 370
Wed 19/36:15 a.m.YOW - SEA
1 stop11h 06mMultiple Airlines
Fri 4/43:15 p.m.SEA - YOW
2 stops22h 15mMultiple Airlines
Deal found 20/1C$ 374
Thu 27/28:00 a.m.YYZ - SEA
1 stop9h 30mAir Canada
Fri 28/27:05 p.m.SEA - YYZ
1 stop8h 04mAir Canada
Deal found 21/1C$ 376
Thu 13/27:05 p.m.YYZ - SEA
Nonstop5h 25mLufthansa
Wed 19/23:24 p.m.SEA - YYZ
1 stop13h 06mLufthansa
Deal found 21/1C$ 386
Thu 20/35:00 p.m.YYZ - SEA
1 stop10h 09mDelta
Sun 23/312:49 a.m.SEA - YYZ
1 stop9h 44mDelta
Deal found 20/1C$ 423
Thu 10/46:30 a.m.YKF - SEA
1 stop10h 51mWestJet
Wed 16/43:15 p.m.SEA - YKF
1 stop7h 01mWestJet
Deal found 20/1C$ 429
Thu 13/26:05 a.m.YYZ - SEA
1 stop18h 15mAmerican Airlines
Tue 18/212:43 a.m.SEA - YYZ
1 stop9h 17mAmerican Airlines
Deal found 21/1C$ 459

Find flights from Ontario to Seattle within your budget

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 21 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 1/5

8:00 a.m.-1:08 p.m.

1 stop8h 08m

Seattle/Tacoma Intl

Sat 10/5

2:05 p.m.-5:51 a.m.

2 stops12h 46m

C$ 337

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 21/3

8:00 p.m.-9:30 a.m.

1 stop16h 30m

Seattle/Tacoma Intl

Mon 24/3

11:42 a.m.-6:43 a.m.

1 stop16h 01m

C$ 341

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 11/2

4:20 p.m.-6:43 p.m.

Nonstop5h 23m

Seattle/Tacoma Intl

Tue 18/2

7:18 a.m.-2:55 p.m.

Nonstop4h 37m

C$ 347

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 4/3

7:05 p.m.-9:30 p.m.

Nonstop5h 25m

Seattle/Tacoma Intl

Wed 12/3

12:55 p.m.-12:22 a.m.

1 stop8h 27m

C$ 348

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 26/3

6:15 a.m.-2:21 p.m.

1 stop11h 06m

Seattle/Tacoma Intl

Thu 27/3

11:30 a.m.-12:44 a.m.

2 stops10h 14m

C$ 348

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Thu 1/5

12:25 p.m.-7:37 p.m.

1 stop10h 12m

Seattle/Tacoma Intl

Fri 9/5

7:20 a.m.-7:50 p.m.

1 stop9h 30m

C$ 370

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 19/3

6:15 a.m.-2:21 p.m.

1 stop11h 06m

Seattle/Tacoma Intl

Fri 4/4

3:15 p.m.-4:30 p.m.

2 stops22h 15m

C$ 374

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 27/2

8:00 a.m.-2:30 p.m.

1 stop9h 30m

Seattle/Tacoma Intl

Fri 28/2

7:05 p.m.-6:09 a.m.

1 stop8h 04m

C$ 376

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 13/2

7:05 p.m.-9:30 p.m.

Nonstop5h 25m

Seattle/Tacoma Intl

Wed 19/2

3:24 p.m.-7:30 a.m.

1 stop13h 06m

C$ 386

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 20/3

5:00 p.m.-12:09 a.m.

1 stop10h 09m

Seattle/Tacoma Intl

Sun 23/3

12:49 a.m.-1:33 p.m.

1 stop9h 44m

C$ 423

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/1

Showing 1-10 of 55 results
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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.

Travel insights for flights from Ontario to Seattle

Get recent, data-driven insights about flights from Ontario to Seattle including ideal travel times, pricing trends, and more.

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$ 257). Flying from Region of Ontario to Seattle in April is currently the most expensive (average of C$ 421). 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 21 January 2025.

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 21 January 2025.

The most flights from CAON to SEA are scheduled on a Monday (4 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 mm per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 21 January 2025.
Read reviews from past customers who have flown United Airlines, American Airlines and Delta from Ontario to Seattle. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,706 reviews
Check prices

Comfort

7.9

Food

7.1

Boarding

8.2

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 10

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Alaska Airlines
8.0
Very good
9,706 reviews
Alaska Airlines
8.0
Very good
9,706 reviews
Check prices

Comfort

7.9

Food

7.1

Boarding

8.2

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 10

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Delta
8.0
Very good
8,521 reviews
Alaska Airlines
8.0
Very good
9,706 reviews
Check prices

Comfort

7.9

Food

7.1

Boarding

8.2

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 10

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

United Airlines
7.4
Good
8,984 reviews
Alaska Airlines
8.0
Very good
9,706 reviews
Check prices

Comfort

7.9

Food

7.1

Boarding

8.2

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 10

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,706 reviews
Check prices

Comfort

7.9

Food

7.1

Boarding

8.2

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 10

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

WestJet
7.2
Good
2,829 reviews
Alaska Airlines
8.0
Very good
9,706 reviews
Check prices

Comfort

7.9

Food

7.1

Boarding

8.2

Overall

8.0

Entertainment

7.1

Crew

8.5

Reviews

1 / 10

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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.

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

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as C$ 212. Users have also found prices from C$ 214 and C$ 216 on WestJet and Air Canada, 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 Montreal Pierre Elliott Trudeau Intl - Seattle/Tacoma Intl or Toronto Region of Waterloo Intl - 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 Qatar Airways (88%), Alaska Airlines (82%) or Hawaiian Airlines (82%) 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$ 201. While the most popular route (Toronto Pearson Intl - Seattle/Tacoma Intl) can be booked for C$ 335 on average our data indicates C$ 1,401 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$ 257). Flying from Region of Ontario to Seattle in April is currently the most expensive (average of C$ 421). 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 Ontario?

Book flights to Ontario if you plan to visit one of these locations
SeaTac
Marysville
Tukwila
Tacoma
Bothell
Olympia
Lynnwood
Leavenworth

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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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Region of Waterloo Intl to Portland flights
Victoria to Portland flights
Toronto Island to Portland flights
Winnipeg to Portland flights
Hamilton to Portland flights
Halifax to Seattle flights
Kelowna to Portland flights
Regina to Seattle flights
Pearson Intl to Spokane flights
London to Seattle flights
Medicine Hat to Seattle flights
Calgary to Spokane flights
Pearson Intl to Pasco flights
Pierre Elliott Trudeau Intl to Spokane flights
Fort St. John to Portland flights
Vancouver Intl to Bellingham flights
St John to Portland flights
Vancouver Intl to Pullman flights
Edmonton to Spokane flights
Québec City to Portland flights
Saskatoon to Portland flights
Windsor to Seattle flights

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 21 January 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 308AverageC$ 608FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 357AverageC$ 591FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 376AverageC$ 636FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 394AverageC$ 682FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapestC$ 421AverageC$ 635FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapestC$ 561AverageC$ 733FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Seattle from Ontario today with Cheapflights!

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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