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Cheap flights from Seattle to Ontario from C$ 171

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 21/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
25 Nov — 2 Dec1
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 20 November 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 20 November 2024.

Tue 10/127:22 a.m.SEA - YYZ
Nonstop4h 33mAlaska Airlines
Thu 12/124:20 p.m.YYZ - SEA
Nonstop5h 19mAlaska Airlines
Deal found 19/11C$ 386
Tue 10/127:22 a.m.SEA - YYZ
Nonstop4h 33mMultiple Airlines
Thu 12/127:55 a.m.YYZ - SEA
1 stop9h 26mMultiple Airlines
Deal found 19/11C$ 392
Wed 25/123:15 p.m.SEA - YYZ
2 stops11h 45mWestJet
Tue 14/17:55 a.m.YYZ - SEA
1 stop9h 26mWestJet
Deal found 20/11C$ 399
Wed 25/126:05 a.m.SEA - YYZ
Nonstop4h 45mUnited Airlines
Tue 14/17:05 p.m.YYZ - SEA
Nonstop5h 25mUnited Airlines
Deal found 20/11C$ 426
Mon 9/1212:50 a.m.SEA - YYZ
1 stop9h 51mDelta
Thu 12/126:15 p.m.YYZ - SEA
1 stop9h 06mDelta
Deal found 20/11C$ 442
Mon 30/126:05 a.m.SEA - YYZ
Nonstop4h 45mAir Canada
Tue 7/111:00 p.m.YYZ - SEA
1 stop13h 50mAir Canada
Deal found 19/11C$ 459
Mon 9/1212:15 a.m.SEA - YYZ
1 stop7h 41mAmerican Airlines
Fri 13/126:20 p.m.YYZ - SEA
1 stop7h 55mAmerican Airlines
Deal found 19/11C$ 461
Wed 4/123:15 p.m.SEA - YKF
1 stop7h 01mWestJet
Sat 7/126:30 a.m.YKF - SEA
1 stop11h 08mWestJet
Deal found 20/11C$ 494
Thu 12/128:00 a.m.SEA - YUL
1 stop30h 26mMultiple Airlines
Mon 16/121:30 p.m.YUL - SEA
2 stops28h 23mMultiple Airlines
Deal found 19/11C$ 504
Mon 9/129:21 p.m.SEA - YTZ
2 stops19h 44mMultiple Airlines
Fri 13/124:10 p.m.YTZ - SEA
3 stops35h 00mMultiple Airlines
Deal found 19/11C$ 546
Fri 6/125:15 a.m.SEA - YOW
2 stops12h 35mMultiple Airlines
Fri 13/126:10 p.m.YOW - SEA
1 stop23h 43mMultiple Airlines
Deal found 19/11C$ 666
Thu 12/128:15 a.m.SEA - YUL
2 stops12h 26mDelta
Mon 16/126:00 a.m.YUL - SEA
2 stops12h 15mDelta
Deal found 20/11C$ 722

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 645,034 searches. Data last updated 20 November 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 17/1

7:27 a.m.-3:05 p.m.

Nonstop4h 38m

Toronto Pearson Intl

Tue 21/1

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

Nonstop5h 23m

C$ 360

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 16/1

7:27 a.m.-3:05 p.m.

Nonstop4h 38m

Toronto Pearson Intl

Sun 19/1

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

1 stop9h 26m

C$ 364

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 16/1

3:15 p.m.-6:00 a.m.

2 stops11h 45m

Toronto Pearson Intl

Sun 19/1

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

1 stop9h 26m

C$ 400

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 25/12

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

Nonstop4h 45m

Toronto Pearson Intl

Tue 14/1

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

Nonstop5h 25m

C$ 426

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 17/1

10:35 a.m.-9:06 p.m.

1 stop7h 31m

Toronto Pearson Intl

Mon 20/1

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

Nonstop5h 25m

C$ 433

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 9/12

12:50 a.m.-1:41 p.m.

1 stop9h 51m

Toronto Pearson Intl

Thu 12/12

6:15 p.m.-12:21 a.m.

1 stop9h 06m

C$ 442

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Fri 24/1

11:30 a.m.-12:45 a.m.

2 stops10h 15m

Ottawa

Tue 28/1

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

1 stop11h 06m

C$ 461

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Fri 24/1

3:15 p.m.-1:51 p.m.

1 stop19h 36m

Ottawa

Tue 28/1

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

1 stop11h 06m

C$ 477

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Thu 9/1

5:45 a.m.-8:43 p.m.

2 stops11h 58m

Toronto Island

Wed 15/1

8:25 p.m.-2:30 p.m.

2 stops21h 05m

C$ 490

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 4/12

3:15 p.m.-1:16 a.m.

1 stop7h 01m

Toronto Region of Waterloo Intl

Sat 7/12

6:30 a.m.-2:38 p.m.

1 stop11h 08m

C$ 494

Flights are sorted by cheapest round-trip flights first.

Deals found on 20/11

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, October is the cheapest month in which you can book a flight from Seattle to Region of Ontario (average of C$ 178). 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 20 November 2024.

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 20 November 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 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 20 November 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
Check prices

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
Check prices

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
Check prices

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
Check prices

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
Check prices

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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
Check prices

Boarding

8.2

Entertainment

7.1

Comfort

7.9

Overall

8.0

Crew

8.5

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?

    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$ 171), United Airlines (C$ 179), and Delta (C$ 185).

  • 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 Island as they are the most popular.

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

    Consider Alaska Airlines (75%), United Airlines (71%) or Hawaiian Airlines (70%) 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$ 174. On average you can expect to pay C$ 901. The most popular route, (Seattle/Tacoma Intl - Toronto Pearson Intl), can usually be booked for C$ 386.

  • 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, October is the cheapest month in which you can book a flight from Seattle to Region of Ontario (average of C$ 178). 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.

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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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Portland to Williams Lake flights
Portland to Winnipeg flights
Portland to Regina flights
Walla Walla to Pierre Elliott Trudeau Intl flights
Spokane to Winnipeg flights
Portland to Fredericton flights
Portland to Sydney flights

Top 3 airlines flying from Seattle to Ontario

Discover the top 3 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 645,034 searches. Data last updated 20 November 2024.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 228AverageC$ 827FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Alaska AirlinesCheapestC$ 380AverageC$ 662FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 486AverageC$ 813FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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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!

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