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$104+ Cheap flights from Seattle (SEA) to Ontario

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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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Cheap flight deals from Seattle to Ontario

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

Round-trip from

$247
(Kiwi.com)

One-way from

$104
(Kiwi.com)

Good round-trip deal

$304 or less

Good one-way deal

$128 or less
From Seattle/Tacoma Intl to Ontario
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One-way flight from Seattle/Tacoma Intl to Ontario
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Ontario.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Ontario.
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Find flight deals from Seattle to Ontario

Cheapest flights from Seattle to Ontario
Explore the most affordable flight options available from Seattle to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2025.

This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
Mon 2/35:16 pmSEA - YYZ
1 stop10h 27mMultiple Airlines
Mon 2/108:00 pmYYZ - SEA
1 stop31h 19mMultiple Airlines
Deal found 1/20$247
This Trip.com deal was found by Cheapflights users on 1/20. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/53:15 pmSEA - YYZ
2 stops11h 43mWestJet
Wed 3/127:40 amYYZ - SEA
1 stop9h 41mWestJet
Deal found 1/20$250
This SmartFares deal was found by Cheapflights users on 1/20. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/107:17 amSEA - YYZ
Nonstop4h 38mAlaska Airlines
Tue 2/184:20 pmYYZ - SEA
Nonstop5h 24mAlaska Airlines
Deal found 1/20$252
This Kiwi.com deal was found by Cheapflights users on 1/21. 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 3/43:48 pmSEA - YOW
1 stop21h 57mMultiple Airlines
Tue 3/116:55 pmYOW - SEA
1 stop22h 26mMultiple Airlines
Deal found 1/21$275
This Kiwi.com deal was found by Cheapflights users on 1/20. 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 3/411:30 amSEA - YOW
2 stops10h 14mWestJet
Wed 3/196:15 amYOW - SEA
1 stop11h 06mWestJet
Deal found 1/20$278
This Flightnetwork deal was found by Cheapflights users on 1/20. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/56:05 amSEA - YYZ
Nonstop4h 45mAir Canada
Wed 3/127:05 pmYYZ - SEA
Nonstop5h 25mAir Canada
Deal found 1/20$288
This United Airlines deal was found by Cheapflights users on 1/20. 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.
Wed 3/56:05 amSEA - YYZ
Nonstop4h 45mUnited Airlines
Wed 3/127:05 pmYYZ - SEA
Nonstop5h 25mUnited Airlines
Deal found 1/20$290
This Mytrip deal was found by Cheapflights users on 1/19. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/411:30 amSEA - YKF
2 stops34h 46mWestJet
Tue 3/116:30 amYKF - SEA
1 stop10h 51mWestJet
Deal found 1/19$307
This Kiwi.com deal was found by Cheapflights users on 1/20. 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.
Mon 3/37:47 pmSEA - YUL
1 stop17h 48mMultiple Airlines
Mon 3/106:35 pmYUL - SEA
1 stop19h 17mMultiple Airlines
Deal found 1/20$309
This Booking.com deal was found by Cheapflights users on 1/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/55:45 amSEA - YTZ
2 stops13h 05mAir Canada
Wed 3/126:25 pmYTZ - SEA
2 stops23h 05mAir Canada
Deal found 1/20$315
This Delta deal was found by Cheapflights users on 1/21. 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.
Mon 5/511:05 pmSEA - YYZ
1 stop6h 45mDelta
Fri 5/95:45 pmYYZ - SEA
1 stop9h 14mDelta
Deal found 1/21$317
This Mytrip deal was found by Cheapflights users on 1/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/45:38 pmSEA - YTZ
3 stops22h 15mMultiple Airlines
Tue 3/113:25 pmYTZ - SEA
2 stops23h 21mMultiple Airlines
Deal found 1/20$320

Find flights from Seattle to Ontario within your budget

Customize your flight search to find flights from Seattle to Ontario 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 January 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 2/3

5:16 pm-6:43 am

1 stop10h 27m

Toronto Pearson Intl

Mon 2/10

8:00 pm-12:19 am

1 stop31h 19m

$247

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 3/5

3:15 pm-5:58 am

2 stops11h 43m

Toronto Pearson Intl

Wed 3/12

7:40 am-2:21 pm

1 stop9h 41m

$250

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 2/10

7:17 am-2:55 pm

Nonstop4h 38m

Toronto Pearson Intl

Tue 2/18

4:20 pm-6:44 pm

Nonstop5h 24m

$252

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Tue 3/4

3:48 pm-4:45 pm

1 stop21h 57m

Ottawa

Tue 3/11

6:55 pm-2:21 pm

1 stop22h 26m

$275

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Tue 3/4

11:30 am-12:44 am

2 stops10h 14m

Ottawa

Wed 3/19

6:15 am-2:21 pm

1 stop11h 06m

$278

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 3/5

6:05 am-1:50 pm

Nonstop4h 45m

Toronto Pearson Intl

Wed 3/12

7:05 pm-9:30 pm

Nonstop5h 25m

$288

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 3/5

6:05 am-1:50 pm

Nonstop4h 45m

Toronto Pearson Intl

Wed 3/12

7:05 pm-9:30 pm

Nonstop5h 25m

$290

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 3/4

11:30 am-1:16 am

2 stops34h 46m

Toronto Region of Waterloo Intl

Tue 3/11

6:30 am-2:21 pm

1 stop10h 51m

$307

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Mon 3/3

7:47 pm-4:35 pm

1 stop17h 48m

Montreal Pierre Elliott Trudeau Intl

Mon 3/10

6:35 pm-10:52 am

1 stop19h 17m

$309

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Wed 3/5

5:45 am-9:50 pm

2 stops13h 05m

Toronto Island

Wed 3/12

6:25 pm-2:30 pm

2 stops23h 05m

$315

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 57 results
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Best time to book a flight from Seattle to Ontario

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

Travel insights for flights from Seattle to Ontario

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

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

Currently, January is the cheapest month in which you can book a flight from Seattle to Region of Ontario (average of $243). Flying from Seattle to Region of Ontario in July is currently the most expensive (average of $359). 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 SEA to ON?

Find hourly flight availability from Seattle to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 21, 2025.

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

Weekly flight availability from Seattle to Region of Ontario

Explore weekly flight availability from Seattle to Ontario. 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 January 21, 2025.

The most flights from SEA to CAON 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 Ontario by month

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

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Region of Ontario, 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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated January 21, 2025.
Read through reviews of airlines operating flights from Seattle to Ontario, such as WestJet, United Airlines and Delta. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,706 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 10

Seats were not that comfy especially for someone with big hips 😥

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

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 10

Seats were not that comfy especially for someone with big hips 😥

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

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 10

Seats were not that comfy especially for someone with big hips 😥

United Airlines
7.4
Good
8,985 reviews
Alaska Airlines
8.0
Very good
9,706 reviews

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 10

Seats were not that comfy especially for someone with big hips 😥

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

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 10

Seats were not that comfy especially for someone with big hips 😥

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

Comfort

7.9

Crew

8.5

Food

7.1

Boarding

8.2

Entertainment

7.1

Overall

8.0

Reviews

1 / 10

Seats were not that comfy especially for someone with big hips 😥

Related info for your journey

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

    For a flight from Seattle to Ontario, you will be flying from Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city.

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

    To fly one-way, consider booking your trip with Alaska Airlines, which is currently one of the cheapest options available, starting at $115. United Airlines flights start at $121 while deals on Delta start at $132 one-way.

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

    The most popular route from Seattle to Region of Ontario is Seattle/Tacoma Intl - Toronto Pearson Intl. You may also consider Seattle/Tacoma Intl - Montreal Pierre Elliott Trudeau Intl or Seattle/Tacoma Intl - Toronto Region of Waterloo Intl.

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

    The top 3 most reliable airlines when flying from Seattle to Region of Ontario are Air Canada (92%), United Airlines (92%) and Qatar Airways (88%).

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

    Looking for the cheapest flight from Seattle to Region of Ontario? While on average our users pay $575, our data indicates the cheapest price to be $99. The most popular route (Seattle/Tacoma Intl - Toronto Pearson Intl), is priced around $209.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Seattle to Region of Ontario (average of $243). Flying from Seattle to Region of Ontario in July is currently the most expensive (average of $359). 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 Seattle to Ontario

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

Discover the top 6 airlines that operate flights from Seattle to Ontario. 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 January 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$169Average$558FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$172Average$544FlexibilityNo cancel feeOn-time69%
WestJetCheapest$235Average$512FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$248Average$514FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$464Average$844FlexibilityNo cancel feeOn-time71%
DeltaCheapest$490Average$594FlexibilityNo cancel feeOn-timeN/A
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