HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$122+ 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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
nov. 25 — dic. 21
lun. 11/25
lun. 12/2
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Ontario with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 noviembre 20, 2024.

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 noviembre 20, 2024.

This Alaska Airlines deal was found by Cheapflights users on 11/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/107:22 amSEA - YYZ
Nonstop4h 33mAlaska Airlines
jue. 12/124:20 pmYYZ - SEA
Nonstop5h 19mAlaska Airlines
Deal found 11/19$276
This Expedia deal was found by Cheapflights users on 11/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/107:22 amSEA - YYZ
Nonstop4h 33mMultiple Airlines
jue. 12/127:55 amYYZ - SEA
1 stop9h 26mMultiple Airlines
Deal found 11/19$280
This Justfly.com deal was found by Cheapflights users on 11/20. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/253:15 pmSEA - YYZ
2 stops11h 45mWestJet
mar. 1/147:55 amYYZ - SEA
1 stop9h 26mWestJet
Deal found 11/20$285
This United Airlines deal was found by Cheapflights users on 11/20. 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.
mié. 12/256:05 amSEA - YYZ
Nonstop4h 45mUnited Airlines
mar. 1/147:05 pmYYZ - SEA
Nonstop5h 25mUnited Airlines
Deal found 11/20$304
This Delta deal was found by Cheapflights users on 11/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/912:50 amSEA - YYZ
1 stop9h 51mDelta
jue. 12/126:15 pmYYZ - SEA
1 stop9h 06mDelta
Deal found 11/20$316
This Air Canada deal was found by Cheapflights users on 11/19. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/306:05 amSEA - YYZ
Nonstop4h 45mAir Canada
mar. 1/711:00 pmYYZ - SEA
1 stop13h 50mAir Canada
Deal found 11/19$328
This American Airlines deal was found by Cheapflights users on 11/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/912:15 amSEA - YYZ
1 stop7h 41mAmerican Airlines
vie. 12/136:20 pmYYZ - SEA
1 stop7h 55mAmerican Airlines
Deal found 11/19$329
This Trip.com deal was found by Cheapflights users on 11/20. 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.
mié. 12/43:15 pmSEA - YKF
1 stop7h 01mWestJet
sáb. 12/76:30 amYKF - SEA
1 stop11h 08mWestJet
Deal found 11/20$353
This Kiwi.com deal was found by Cheapflights users on 11/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/128:00 amSEA - YUL
1 stop30h 26mMultiple Airlines
lun. 12/161:30 pmYUL - SEA
2 stops28h 23mMultiple Airlines
Deal found 11/19$360
This Mytrip deal was found by Cheapflights users on 11/19. 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.
lun. 12/99:21 pmSEA - YTZ
2 stops19h 44mMultiple Airlines
vie. 12/134:10 pmYTZ - SEA
3 stops35h 00mMultiple Airlines
Deal found 11/19$390
This Kiwi.com deal was found by Cheapflights users on 11/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 12/65:15 amSEA - YOW
2 stops12h 35mMultiple Airlines
vie. 12/136:10 pmYOW - SEA
1 stop23h 43mMultiple Airlines
Deal found 11/19$476
This Delta deal was found by Cheapflights users on 11/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/128:15 amSEA - YUL
2 stops12h 26mDelta
lun. 12/166:00 amYUL - SEA
2 stops12h 15mDelta
Deal found 11/20$516

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 2,629,791 searches. Data last updated noviembre 20, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

vie. 1/31

7:27 am-3:05 pm

Nonstop4h 38m

Toronto Pearson Intl

lun. 2/3

4:20 pm-6:43 pm

Nonstop5h 23m

$257

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

vie. 1/31

7:27 am-3:05 pm

Nonstop4h 38m

Toronto Pearson Intl

lun. 2/3

7:55 am-2:21 pm

1 stop9h 26m

$259

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

vie. 1/31

3:15 pm-5:58 am

2 stops11h 43m

Toronto Pearson Intl

lun. 2/3

8:00 am-2:21 pm

1 stop9h 21m

$261

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mié. 12/25

6:05 am-1:50 pm

Nonstop4h 45m

Toronto Pearson Intl

mar. 1/14

7:05 pm-9:30 pm

Nonstop5h 25m

$304

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mar. 3/4

6:05 am-1:50 pm

Nonstop4h 45m

Toronto Pearson Intl

vie. 3/7

7:05 pm-9:30 pm

Nonstop5h 25m

$305

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

lun. 12/9

12:50 am-1:41 pm

1 stop9h 51m

Toronto Pearson Intl

jue. 12/12

6:15 pm-12:21 am

1 stop9h 06m

$316

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

jue. 1/30

12:45 am-4:15 pm

1 stop12h 30m

Toronto Pearson Intl

lun. 2/3

5:10 pm-11:11 pm

1 stop9h 01m

$329

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

vie. 1/24

11:30 am-12:45 am

2 stops10h 15m

Ottawa

mar. 1/28

6:15 am-2:21 pm

1 stop11h 06m

$329

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

vie. 1/24

3:15 pm-1:51 pm

1 stop19h 36m

Ottawa

mar. 1/28

6:15 am-2:21 pm

1 stop11h 06m

$341

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

jue. 1/9

5:45 am-8:43 pm

2 stops11h 58m

Toronto Island

mié. 1/15

8:25 pm-2:30 pm

2 stops21h 05m

$350

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/20

Showing 1-10 of 56 results
1
2
3
...
6

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 $242). 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 noviembre 20, 2024.

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 noviembre 20, 2024.

The most flights from SEA to CAON are scheduled on a Monday (5 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (1 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 noviembre 20, 2024.
Read through reviews of airlines operating flights from Seattle to Ontario, such as Air Canada, American Airlines and Alaska Airlines. 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
9,461 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.2

Reviews

1 / 10

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

Alaska Airlines
8.0
Very good
9,461 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.2

Reviews

1 / 10

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

Delta
8.0
Very good
8,756 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.2

Reviews

1 / 10

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

Porter Airlines
7.8
Good
288 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.2

Reviews

1 / 10

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

United Airlines
7.4
Good
9,171 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.2

Reviews

1 / 10

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

WestJet
7.3
Good
2,811 reviews
Alaska Airlines
8.0
Very good
9,461 reviews

Crew

8.5

Comfort

7.9

Overall

8.0

Boarding

8.2

Entertainment

7.1

Food

7.2

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 WestJet, which is currently one of the cheapest options available, starting at $122. United Airlines flights start at $128 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 Island.

  • 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 Alaska Airlines (75%), United Airlines (71%) and Hawaiian Airlines (70%).

  • 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 $535, our data indicates the cheapest price to be $109. The most popular route (Seattle/Tacoma Intl - Toronto Pearson Intl), is priced around $276.

  • 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 $242). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Vancouver Intl flights
Seattle to Pearson Intl flights
Portland to Vancouver Intl flights
Seattle to Calgary flights
Seattle to Pierre Elliott Trudeau Intl flights
Seattle to Edmonton flights
Portland to Calgary flights
Portland to Pearson Intl flights
Seattle to Kelowna flights
Seattle to Region of Waterloo Intl flights
Seattle to Québec City flights
Seattle to Toronto Island flights
Portland to Pierre Elliott Trudeau Intl flights
Seattle to Winnipeg flights
Portland to Edmonton flights
Seattle to Ottawa flights
Spokane to Vancouver Intl flights
Seattle to Victoria flights
Seattle to Hamilton flights
Seattle to Saskatoon flights
Spokane to Calgary flights
Spokane to Pearson Intl flights
Portland to Victoria flights
Seattle to Sydney flights
Seattle to Fort McMurray flights
Seattle to London flights
Yakima to Vancouver Intl flights
Seattle to St. John's flights
Portland to Toronto Island flights
Seattle to Halifax flights
Seattle to Yellowknife flights
Seattle to Regina flights
Seattle to Penticton flights
Portland to Kelowna flights
Pasco to Vancouver Intl flights
Portland to Ottawa flights
Seattle to Comox flights
Spokane to Edmonton flights
Pasco to Pearson Intl flights
Seattle to Nanaimo flights
Bellingham to Pearson Intl flights
Portland to Québec City flights
Seattle to Charlottetown flights
Portland to Halifax flights
Seattle to Kamloops flights
Seattle to Whitehorse flights
Seattle to Castlegar flights
Portland to Kamloops flights
Seattle to St John flights
Portland to Winnipeg flights

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 2,629,791 searches. Data last updated noviembre 20, 2024.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$172Average$557FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$178Average$505FlexibilityNo cancel feeOn-time67%
WestJetCheapest$235Average$530FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$248Average$516FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$464Average$844FlexibilityNo cancel feeOn-time71%
DeltaCheapest$474Average$593FlexibilityNo cancel feeOn-timeN/A
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines