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Cheap flights from Washington to Ontario from C$ 127

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 22/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
30 Nov — 7 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Washington to Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Washington to Ontario
Explore the most affordable flight options available from Washington to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 31 October 2025.

Wed 10/123:10 p.m.SEA - YYZ
2 stops11h 48mWestJet
Fri 12/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Deal found 30/10C$ 339
Thu 4/123:10 p.m.SEA - YYZ
2 stops11h 48mWestJet
Sun 7/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Deal found 29/10C$ 341
Thu 11/123:10 p.m.SEA - YYZ
2 stops11h 48mWestJet
Sun 14/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Deal found 29/10C$ 344
Fri 21/1111:55 a.m.SEA - YYZ
2 stops8h 44mMultiple Airlines
Mon 24/114:45 p.m.YYZ - SEA
Nonstop5h 32mMultiple Airlines
Deal found 30/10C$ 345
Sat 6/1211:55 a.m.SEA - YYZ
2 stops8h 44mMultiple Airlines
Sat 13/124:45 p.m.YYZ - SEA
Nonstop5h 33mMultiple Airlines
Deal found 30/10C$ 346
Fri 28/1111:55 a.m.SEA - YYZ
1 stop16h 03mWestJet
Tue 2/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Deal found 29/10C$ 348
Sat 29/1110:05 a.m.SEA - YYZ
2 stops9h 36mAir Canada
Sat 6/128:00 a.m.YYZ - SEA
2 stops9h 31mAir Canada
Deal found 29/10C$ 349
Tue 9/127:55 a.m.SEA - YYZ
Nonstop4h 40mAlaska Airlines
Wed 10/124:45 p.m.YYZ - SEA
Nonstop5h 33mAlaska Airlines
Deal found 30/10C$ 350
Sat 6/1211:55 a.m.SEA - YYZ
2 stops8h 44mMultiple Airlines
Fri 12/124:45 p.m.YYZ - SEA
Nonstop5h 33mMultiple Airlines
Deal found 30/10C$ 353
Tue 25/117:57 a.m.SEA - YYZ
Nonstop4h 38mMultiple Airlines
Sun 7/127:45 a.m.YYZ - SEA
1 stop9h 35mMultiple Airlines
Deal found 29/10C$ 355
Sun 7/127:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Wed 10/127:45 a.m.YYZ - SEA
1 stop9h 35mMultiple Airlines
Deal found 30/10C$ 356
Wed 12/119:50 a.m.PDX - YYZ
1 stop8h 04mAir Canada
Wed 19/119:00 a.m.YYZ - PDX
1 stop8h 40mAir Canada
Deal found 28/10C$ 455

Cheap flight deals from Washington to Ontario

Keep the following information in mind while searching for Washington to Ontario flight deals. Data was last updated 31 October 2025.

Round-trip from

C$ 337

One-way from

C$ 127

Popular in

June

Cheapest in

January

Average price

C$ 617

Good round-trip deal

C$ 380 or less

Good one-way deal

C$ 222 or less
WestJet
  • WestJet
  • 15/2-17/2
  • 3 total stops
  • 21h 22m total
  • Washington to Ontario
Search Deals
WestJet
  • WestJet
  • 22/2
  • 2 total stops
  • 11h 48m total
  • Washington to Ontario
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 129 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Washington to Ontario.
Search Deals
Price to beat on a one-way flight from Washington to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 31 October 2025.
Use the filters below to find and compare flights from Washington to Ontario that are best for you.

Fly from

Washington

Fly to

Ontario

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Sat 13/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 350

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 9/1

3:10 p.m.-5:28 a.m.

1 stop11h 18m

Toronto Region of Waterloo Intl

Sat 10/1

7:00 p.m.-2:20 p.m.

1 stop22h 20m

C$ 350

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Wed 10/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 350

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 25/11

7:57 a.m.-3:35 p.m.

Nonstop4h 38m

Toronto Pearson Intl

Mon 8/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 366

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 7/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Tue 9/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 366

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 10/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Mon 15/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 366

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 19/11

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Thu 20/11

4:45 p.m.-7:05 p.m.

Nonstop5h 20m

C$ 366

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 8/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Wed 10/12

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 366

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 10/3

8:00 a.m.-3:35 p.m.

Nonstop4h 35m

Toronto Pearson Intl

Wed 11/3

4:45 p.m.-7:05 p.m.

Nonstop5h 20m

C$ 381

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Wed 21/1

5:50 a.m.-3:45 p.m.

1 stop6h 55m

Ottawa

Fri 23/1

5:45 a.m.-2:31 p.m.

2 stops11h 46m

C$ 388

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/10

Showing 1-10 of 60 results
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Best time to book a flight from Washington to Ontario

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

Cheapflights Insights

Everything you need to know about your flight from Washington to Ontario

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

Currently, March is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of C$ 169). Flying from State of Washington to Region of Ontario in May is currently the most expensive (average of C$ 378). 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 WA to ON?

Find hourly flight availability from Washington 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 31 October 2025.

A simple way to save on the total cost of your ticket is to fly from State of Washington to Region of Ontario in the afternoon. If you’re flexible enough to do this you can expect to save up to 20% on your trip compared to booking a flight in the morning.

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 31 October 2025.
Get a feel of what it's like to fly with Alaska Airlines,United Airlines, andWestJet from Washington to Ontario by reading reviews from past customers. 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
11,219 reviews
Check prices

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,219 reviews
Alaska Airlines
8.0
Very good
11,219 reviews
Check prices

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
8,995 reviews
Alaska Airlines
8.0
Very good
11,219 reviews
Check prices

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
WestJet
7.2
Good
3,153 reviews
Alaska Airlines
8.0
Very good
11,219 reviews
Check prices

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Air Canada
7.1
Good
10,385 reviews
Alaska Airlines
8.0
Very good
11,219 reviews
Check prices

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

Related info for your journey

Find useful and relevant information for your journey from Washington to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from State of Washington to Region of Ontario?

    There are many flights that can get you from State of Washington to Region of Ontario in 4h 40m. Fly via Alaska Airlines, WestJet, or Air Canada to get the fastest option. Airlines will cover a distance of 3306 km. Both multi-stop and direct flights can be found to your destination and back.

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

    The cheapest airlines for a one-way flight from State of Washington to Region of Ontario are WestJet (C$ 135), Alaska Airlines (C$ 141), and Air Canada (C$ 193).

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of C$ 169). Flying from State of Washington to Region of Ontario in May is currently the most expensive (average of C$ 378). 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

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Alternative routes for Washington to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Washington to Ontario

Discover the top 4 airlines that operate flights from Washington 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 31 October 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 288AverageC$ 394FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Air CanadaCheapestC$ 326AverageC$ 568FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Alaska AirlinesCheapestC$ 372AverageC$ 758FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 485AverageC$ 545FlexibilityNo cancel feeOn-time69%
Search United 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 Washington to Ontario?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Ontario from Washington today with Cheapflights!

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

Cheapflights simply makes it quick and affordable to book flights from Washington 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 Washington to Ontario with no change fees?

Certainly. Search results for flights to Ontario from Washington shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Of course! You can now track prices for flights from Washington to Ontario and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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