Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Seattle to Ontario from C$ 161

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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
22 Jan — 29 Jan1
1 adult

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 17 January 2025.

Round-trip from

C$ 356

One-way from

C$ 161
11/3-13/3
  • 11/3-13/3
  • 2 total stops
  • 34h 41m total
  • Seattle to Ontario
Search Deals
3/2
  • 3/2
  • 2 total stops
  • 28h 24m total
  • Seattle to Ontario
Search Deals

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 17 January 2025.

Tue 11/311:48 a.m.SEA - YYZ
1 stop15h 55mMultiple Airlines
Thu 13/38:00 p.m.YYZ - SEA
1 stop18h 46mMultiple Airlines
Deal found 15/1C$ 356
Tue 18/27:18 a.m.SEA - YYZ
Nonstop4h 37mAlaska Airlines
Sat 22/24:20 p.m.YYZ - SEA
Nonstop5h 24mAlaska Airlines
Deal found 16/1C$ 382
Wed 12/33:15 p.m.SEA - YYZ
2 stops11h 43mWestJet
Wed 19/37:55 a.m.YYZ - SEA
1 stop9h 26mWestJet
Deal found 16/1C$ 391
Thu 27/311:30 a.m.SEA - YOW
2 stops10h 14mWestJet
Tue 1/46:15 a.m.YOW - SEA
1 stop11h 06mWestJet
Deal found 15/1C$ 402
Mon 3/29:40 a.m.SEA - YTZ
2 stops31h 25mMultiple Airlines
Mon 10/24:10 p.m.YTZ - SEA
3 stops27h 50mMultiple Airlines
Deal found 15/1C$ 411
Mon 17/33:15 p.m.SEA - YKF
1 stop12h 25mMultiple Airlines
Mon 24/39:30 p.m.YKF - SEA
2 stops15h 30mMultiple Airlines
Deal found 14/1C$ 425
Thu 20/25:02 a.m.SEA - YYZ
1 stop8h 25mUnited Airlines
Thu 20/27:05 p.m.YYZ - SEA
Nonstop5h 25mUnited Airlines
Deal found 15/1C$ 435
Thu 6/26:05 a.m.SEA - YYZ
Nonstop4h 45mAir Canada
Wed 12/27:05 p.m.YYZ - SEA
Nonstop5h 25mAir Canada
Deal found 15/1C$ 441
Sun 2/311:38 a.m.SEA - YOW
1 stop26h 07mMultiple Airlines
Sun 9/36:55 p.m.YOW - SEA
2 stops18h 05mMultiple Airlines
Deal found 16/1C$ 463
Mon 17/27:47 p.m.SEA - YUL
1 stop17h 48mMultiple Airlines
Mon 24/26:45 a.m.YUL - SEA
1 stop14h 59mMultiple Airlines
Deal found 16/1C$ 466
Tue 6/57:20 a.m.SEA - YTZ
1 stop9h 30mAir Canada
Sat 10/512:25 p.m.YTZ - SEA
1 stop10h 12mAir Canada
Deal found 15/1C$ 470
Thu 13/312:49 a.m.SEA - YYZ
1 stop9h 44mDelta
Tue 25/36:15 a.m.YYZ - SEA
1 stop9h 15mDelta
Deal found 15/1C$ 481

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 629,999 searches. Data last updated 17 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 11/3

11:48 a.m.-6:43 a.m.

1 stop15h 55m

Toronto Pearson Intl

Thu 13/3

8:00 p.m.-11:46 a.m.

1 stop18h 46m

C$ 356

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 18/2

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

Nonstop4h 37m

Toronto Pearson Intl

Fri 21/2

4:20 p.m.-6:44 p.m.

Nonstop5h 24m

C$ 382

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 12/3

3:15 p.m.-5:58 a.m.

2 stops11h 43m

Toronto Pearson Intl

Wed 19/3

7:55 a.m.-2:21 p.m.

1 stop9h 26m

C$ 391

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Thu 27/3

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

2 stops10h 14m

Ottawa

Tue 1/4

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

1 stop11h 06m

C$ 402

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Mon 3/2

9:40 a.m.-8:05 p.m.

2 stops31h 25m

Toronto Island

Mon 10/2

4:10 p.m.-5:00 p.m.

3 stops27h 50m

C$ 411

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 17/3

3:15 p.m.-6:40 a.m.

1 stop12h 25m

Toronto Region of Waterloo Intl

Mon 24/3

9:30 p.m.-10:00 a.m.

2 stops15h 30m

C$ 425

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 20/2

11:59 p.m.-4:46 p.m.

1 stop13h 47m

Toronto Pearson Intl

Fri 21/2

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

Nonstop5h 25m

C$ 435

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 6/2

6:05 a.m.-1:50 p.m.

Nonstop4h 45m

Toronto Pearson Intl

Wed 12/2

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

Nonstop5h 25m

C$ 441

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Sun 2/3

11:38 a.m.-4:45 p.m.

1 stop26h 07m

Ottawa

Sun 9/3

6:55 p.m.-10:00 a.m.

2 stops18h 05m

C$ 463

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Mon 17/2

7:47 p.m.-4:35 p.m.

1 stop17h 48m

Montreal Pierre Elliott Trudeau Intl

Mon 24/2

6:45 a.m.-6:44 p.m.

1 stop14h 59m

C$ 466

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/1

Showing 1-10 of 52 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 C$ 168). Flying from Seattle to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 17 January 2025.

When flying from Seattle to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 17 January 2025.

The most flights from SEA to CAON are scheduled on a Wednesday (5 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 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 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

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 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

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 17 January 2025.
Read through reviews of airlines operating flights from Seattle to Ontario, such as United Airlines, Delta and Air Canada. 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
9,681 reviews
Check prices

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 10

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

Alaska Airlines
8.0
Very good
9,681 reviews
Alaska Airlines
8.0
Very good
9,681 reviews
Check prices

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 10

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

Delta
8.0
Very good
8,511 reviews
Alaska Airlines
8.0
Very good
9,681 reviews
Check prices

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 10

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

United Airlines
7.4
Good
8,964 reviews
Alaska Airlines
8.0
Very good
9,681 reviews
Check prices

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Entertainment

7.1

Food

7.1

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
9,681 reviews
Check prices

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Entertainment

7.1

Food

7.1

Reviews

1 / 10

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

WestJet
7.2
Good
2,824 reviews
Alaska Airlines
8.0
Very good
9,681 reviews
Check prices

Boarding

8.2

Crew

8.5

Overall

8.0

Comfort

7.9

Entertainment

7.1

Food

7.1

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?

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

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

    The cheapest airlines for a one-way flight from Seattle to Region of Ontario are WestJet (C$ 162), Alaska Airlines (C$ 171), and Air Canada (C$ 190).

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

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

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

    Consider Air Canada (92%), United Airlines (92%) or Qatar Airways (88%) when booking your flight. These represent the most reliable airlines when flying from Seattle to Region of Ontario.

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

    The cheapest flight price from Seattle to Region of Ontario is C$ 162. On average you can expect to pay C$ 862. The most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl), can usually be booked for C$ 323.

  • 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 C$ 168). Flying from Seattle to Region of Ontario in July is currently the most expensive (average of C$ 258). 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
Seattle to Calgary flights
Portland to Vancouver Intl flights
Seattle to Pierre Elliott Trudeau Intl flights
Seattle to Kelowna flights
Seattle to Region of Waterloo Intl flights
Portland to Calgary flights
Portland to Edmonton flights
Seattle to Victoria flights
Portland to Pearson Intl flights
Seattle to Edmonton flights
Seattle to Winnipeg flights
Seattle to Ottawa flights
Portland to Pierre Elliott Trudeau Intl flights
Seattle to Québec City flights
Spokane to Vancouver Intl flights
Seattle to Hamilton flights
Portland to Victoria flights
Seattle to Kamloops flights
Spokane to Calgary flights
Seattle to St. John's flights
Seattle to Yellowknife flights
Seattle to Regina flights
Seattle to Halifax flights
Portland to Ottawa flights
Spokane to Pearson Intl flights
Pasco to Vancouver Intl flights
Pasco to Pearson Intl flights
Seattle to Campbell River flights
Seattle to Saskatoon flights
Portland to Winnipeg flights
Portland to Nanaimo flights
Portland to Halifax flights
Spokane to Edmonton flights
Seattle to London flights
Pasco to Pierre Elliott Trudeau Intl flights
Spokane to Winnipeg flights
Seattle to Fort McMurray flights
Portland to Whitehorse flights
Portland to Fredericton flights
Spokane to Halifax flights
Portland to Charlottetown flights
Portland to Saskatoon flights
Portland to Sydney flights

Top 2 airlines flying from Seattle to Ontario

Discover the top 2 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 629,999 searches. Data last updated 17 January 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 234AverageC$ 842FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Alaska AirlinesCheapestC$ 383AverageC$ 659FlexibilityNo cancel feeOn-time75%
Search Alaska 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 Seattle to Ontario?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Seattle to Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights simply makes it quick and affordable to book flights from Seattle to Ontario by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Seattle to Ontario with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to Ontario flexibly with Cheapflights today.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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.