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$151+ Cheap flights from Ontario to Seattle (SEA)

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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
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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 December 18, 2024.

Round-trip from

$254
(United Airlines)

One-way from

$151
(Air Canada)
From Ontario to Seattle/Tacoma Intl
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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 December 18, 2024.

This United Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/242:10 pmYOW - SEA
1 stop10h 10mUnited Airlines
Thu 1/26:05 amSEA - YOW
1 stop12h 32mUnited Airlines
Deal found 12/17$406
This Kiwi.com deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/316:30 amYYZ - SEA
2 stops14h 31mMultiple Airlines
Wed 1/82:16 pmSEA - YYZ
1 stop13h 30mMultiple Airlines
Deal found 12/17$426
This FlightHub deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2910:40 pmYYZ - SEA
1 stop12h 25mWestJet
Thu 1/93:15 pmSEA - YYZ
2 stops11h 45mWestJet
Deal found 12/17$439
This United Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/246:30 amYYZ - SEA
1 stop11h 55mUnited Airlines
Tue 1/215:25 pmSEA - YYZ
1 stop19h 01mUnited Airlines
Deal found 12/17$497
This Delta deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/277:15 amYYZ - SEA
1 stop8h 30mDelta
Tue 1/76:00 amSEA - YYZ
1 stop10h 09mDelta
Deal found 12/17$506
This American Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/235:14 pmYYZ - SEA
1 stop10h 43mAmerican Airlines
Tue 1/2110:18 pmSEA - YYZ
1 stop17h 08mAmerican Airlines
Deal found 12/17$510
This Alaska Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/244:22 pmYYZ - SEA
Nonstop5h 20mAlaska Airlines
Sat 2/17:27 amSEA - YYZ
Nonstop4h 38mAlaska Airlines
Deal found 12/17$533
This CheapTicketsDeal deal was found by Cheapflights users on 12/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapTicketsDeal is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/295:55 amYOW - SEA
2 stops29h 10mWestJet
Tue 1/73:15 pmSEA - YOW
1 stop22h 33mWestJet
Deal found 12/18$548
This Air Canada deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/232:10 pmYOW - SEA
1 stop10h 10mAir Canada
Thu 1/26:05 amSEA - YOW
1 stop8h 17mAir Canada
Deal found 12/16$551
This WestJet deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/246:05 pmYHM - SEA
2 stops25h 55mWestJet
Tue 1/213:15 pmSEA - YHM
1 stop22h 58mWestJet
Deal found 12/17$557
This Kiwi.com deal was found by Cheapflights users on 12/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/256:45 amYUL - SEA
2 stops13h 15mMultiple Airlines
Fri 1/32:16 pmSEA - YUL
1 stop23h 19mMultiple Airlines
Deal found 12/16$563
This Air Canada deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/188:45 amYYZ - SEA
1 stop8h 40mAir Canada
Sat 1/186:05 amSEA - YYZ
Nonstop4h 45mAir Canada
Deal found 12/17$583

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 2,558,603 searches. Data last updated December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sat 2/15

7:05 pm-9:30 pm

Nonstop5h 25m

Seattle/Tacoma Intl

Tue 2/25

5:02 am-3:02 pm

1 stop7h 00m

$254

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sat 1/18

8:00 am-2:25 pm

1 stop9h 25m

Seattle/Tacoma Intl

Tue 1/21

3:05 pm-12:57 am

1 stop6h 52m

$255

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 1/15

8:00 pm-9:40 am

1 stop16h 40m

Seattle/Tacoma Intl

Wed 1/22

7:10 am-11:35 pm

2 stops13h 25m

$256

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sun 2/16

1:20 pm-11:00 pm

1 stop12h 40m

Seattle/Tacoma Intl

Mon 2/24

11:05 pm-11:56 am

1 stop9h 51m

$259

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sun 2/16

4:10 pm-6:34 pm

Nonstop5h 24m

Seattle/Tacoma Intl

Thu 2/27

7:18 am-2:55 pm

Nonstop4h 37m

$263

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Tue 2/11

8:25 pm-2:30 pm

2 stops21h 05m

Seattle/Tacoma Intl

Tue 2/18

5:45 am-9:50 pm

2 stops13h 05m

$292

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 1/10

6:10 pm-12:19 am

1 stop33h 09m

Seattle/Tacoma Intl

Tue 1/14

7:10 am-4:45 pm

1 stop30h 35m

$296

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 1/17

6:15 am-10:00 am

2 stops30h 45m

Seattle/Tacoma Intl

Mon 1/20

3:15 pm-5:33 am

2 stops11h 18m

$297

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 1/16

6:30 am-2:21 pm

1 stop10h 51m

Seattle/Tacoma Intl

Sun 1/19

7:10 am-6:15 am

2 stops20h 05m

$306

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 1/23

11:46 am-7:00 pm

1 stop10h 14m

Seattle/Tacoma Intl

Sun 1/26

12:45 am-4:15 pm

1 stop12h 30m

$320

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 51 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 $238). Flying from Region of Ontario to Seattle in July is currently the most expensive (average of $411). 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 December 18, 2024.

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 December 18, 2024.

The most flights from CAON to SEA are scheduled on a Wednesday (4 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (2 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 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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 December 18, 2024.
Read reviews from past customers who have flown Air Canada, Alaska Airlines and WestJet 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
9,554 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.2

Boarding

8.2

Entertainment

7.1

Reviews

1 / 10

How do online staff who book reservations get a passenger’s birthdate wrong

Alaska Airlines
8.0
Very good
9,554 reviews
Alaska Airlines
8.0
Very good
9,554 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.2

Boarding

8.2

Entertainment

7.1

Reviews

1 / 10

How do online staff who book reservations get a passenger’s birthdate wrong

Delta
8.0
Very good
8,604 reviews
Alaska Airlines
8.0
Very good
9,554 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.2

Boarding

8.2

Entertainment

7.1

Reviews

1 / 10

How do online staff who book reservations get a passenger’s birthdate wrong

Austrian Airlines
7.6
Good
787 reviews
Alaska Airlines
8.0
Very good
9,554 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.2

Boarding

8.2

Entertainment

7.1

Reviews

1 / 10

How do online staff who book reservations get a passenger’s birthdate wrong

United Airlines
7.4
Good
9,055 reviews
Alaska Airlines
8.0
Very good
9,554 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.2

Boarding

8.2

Entertainment

7.1

Reviews

1 / 10

How do online staff who book reservations get a passenger’s birthdate wrong

American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,554 reviews

Crew

8.5

Overall

8.0

Comfort

7.9

Food

7.2

Boarding

8.2

Entertainment

7.1

Reviews

1 / 10

How do online staff who book reservations get a passenger’s birthdate wrong

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?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Ontario to Seattle.

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

    $151 is the cheapest one-way deal found within the past few days, from Air Canada. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from $157 and $159, respectively.

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

    When deciding which route to take from Region of Ontario to Seattle consider Toronto Pearson Intl - Seattle/Tacoma Intl, Montreal Pierre Elliott Trudeau Intl - Seattle/Tacoma Intl or Ottawa - Seattle/Tacoma Intl as they are the most popular.

  • 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 (100%), Hawaiian Airlines (89%) or Alaska Airlines (88%) 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?

    On average you can expect to pay $933 for a flight from Region of Ontario to Seattle. The cheapest flight overall is $157 while the most popular route, (Toronto Pearson Intl - Seattle/Tacoma Intl) is currently priced at $245.

  • 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 $238). Flying from Region of Ontario to Seattle in July is currently the most expensive (average of $411). 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.

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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 2,558,603 searches. Data last updated December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$139Average$505FlexibilityNo cancel feeOn-time67%
WestJetCheapest$163Average$446FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$246Average$422FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$263Average$519FlexibilityNo cancel feeOn-time69%
DeltaCheapest$292Average$472FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$402Average$695FlexibilityNo cancel feeOn-time71%
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