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Cheap flights from Ontario to Washington from C$ 156

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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
15 Oct — 22 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Ontario to Washington

Keep the following information in mind while searching for Ontario to Washington flight deals. Data was last updated 15 September 2025.

Round-trip from

C$ 282

One-way from

C$ 156

Popular in

December

Cheapest in

February

Average price

C$ 548

Good round-trip deal

C$ 495 or less

Good one-way deal

C$ 431 or less
WestJet
  • WestJet
  • 21/10-24/10
  • 2 total stops
  • 17h 49m total
  • Ontario to Washington
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WestJet
  • WestJet
  • 4/10
  • 1 total stop
  • 10h 05m total
  • Ontario to Washington
Search Deals
High demand for flights, 7% potential price rise
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Cheapest flight prices on average. 1% potential price decrease (C$ 10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Ontario to Washington.
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Price to beat on a one-way flight from Ontario to Washington.
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Find flight deals from Ontario to Washington

Cheapest flights from Ontario to Washington
Explore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 September 2025.

Tue 21/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Fri 24/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Deal found 13/9C$ 282
Mon 20/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Fri 24/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Deal found 15/9C$ 285
Wed 15/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Wed 22/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Deal found 15/9C$ 287
Thu 2/106:00 a.m.YKF - PDX
1 stop10h 05mWestJet
Sun 5/101:45 p.m.PDX - YKF
1 stop8h 00mWestJet
Deal found 13/9C$ 307
Thu 13/116:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Wed 19/113:10 p.m.SEA - YKF
1 stop11h 18mWestJet
Deal found 13/9C$ 316
Tue 7/1012:00 p.m.YYZ - SEA
1 stop10h 31mAir Canada
Mon 20/102:55 p.m.SEA - YYZ
1 stop7h 11mAir Canada
Deal found 15/9C$ 316
Wed 15/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Thu 23/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Deal found 15/9C$ 317
Tue 7/104:00 p.m.YYZ - SEA
2 stops9h 31mMultiple Airlines
Wed 8/101:50 p.m.SEA - YYZ
1 stop7h 32mMultiple Airlines
Deal found 14/9C$ 317
Tue 7/106:15 a.m.YYZ - SEA
2 stops11h 01mAir Canada
Tue 21/1010:00 a.m.SEA - YYZ
2 stops9h 05mAir Canada
Deal found 14/9C$ 318
Sat 25/108:00 a.m.YYZ - SEA
1 stop7h 59mMultiple Airlines
Sat 1/117:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Deal found 14/9C$ 320
Tue 11/117:45 a.m.YYZ - SEA
1 stop9h 35mMultiple Airlines
Tue 18/117:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Deal found 13/9C$ 321
Fri 3/106:45 a.m.YYZ - SEA
1 stop8h 50mWestJet
Sun 12/108:40 a.m.SEA - YYZ
1 stop7h 12mWestJet
Deal found 14/9C$ 322

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Washington 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 15 September 2025.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.

Fly from

Ontario

Fly to

Washington

Route

Depart

Return

Price

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Tue 21/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Fri 24/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

C$ 282

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 15/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Wed 22/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

C$ 282

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

Thu 13/11

6:20 a.m.-2:20 p.m.

1 stop11h 00m

Seattle/Tacoma Intl

Wed 19/11

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

1 stop11h 18m

C$ 316

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Wed 15/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Thu 23/10

1:50 p.m.-12:40 a.m.

1 stop7h 50m

C$ 317

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Mon 3/11

6:40 p.m.-11:11 a.m.

1 stop19h 31m

Seattle/Tacoma Intl

Fri 7/11

8:15 a.m.-3:58 p.m.

Nonstop4h 43m

C$ 334

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 28/10

5:30 p.m.-10:45 p.m.

1 stop8h 15m

Seattle/Tacoma Intl

Tue 4/11

11:50 p.m.-1:43 p.m.

1 stop10h 53m

C$ 335

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 8/10

11:00 a.m.-6:49 p.m.

1 stop10h 49m

Seattle/Tacoma Intl

Wed 15/10

6:55 p.m.-9:19 a.m.

2 stops11h 24m

C$ 335

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 29/10

6:52 a.m.-11:43 a.m.

1 stop7h 51m

Seattle/Tacoma Intl

Tue 4/11

5:05 a.m.-3:02 p.m.

1 stop6h 57m

C$ 335

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 18/11

12:45 p.m.-9:33 p.m.

2 stops11h 48m

Seattle/Tacoma Intl

Sat 22/11

7:13 p.m.-4:02 p.m.

2 stops17h 49m

C$ 335

HamiltonSeattle

YHM - SEA

YHMSEA

Hamilton

Thu 23/10

6:00 a.m.-12:59 p.m.

1 stop9h 59m

Seattle/Tacoma Intl

Sun 26/10

3:10 p.m.-5:17 p.m.

1 stop23h 07m

C$ 335

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/9

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

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

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

Currently, January is the cheapest month in which you can book a flight from Region of Ontario to State of Washington (average of C$ 262). Flying from Region of Ontario to State of Washington in December is currently the most expensive (average of C$ 353). 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 ON to WA?

Find hourly flight availability from Ontario to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 15 September 2025.

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

Weekly flight availability from Region of Ontario to State of Washington

Explore weekly flight availability from Ontario to Washington. 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 15 September 2025.

The most flights from CAON to USWA are scheduled on a Sunday (6 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).

How much does it cost to fly round-trip from Region of Ontario to State of Washington?

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated 15 September 2025.
Check out reviews from past customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Ontario to Washington to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Delta
8.0
Very good
7,954 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
United Airlines
7.4
Good
8,929 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
WestJet
7.2
Good
3,091 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Air Canada
7.1
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Food

7.1

Entertainment

7.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

Related info for your journey

Find useful and relevant information for your journey from Ontario to Washington. 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 Region of Ontario to State of Washington?

    For as low as C$ 335, WestJet can have you in State of Washington from Region of Ontario in 8h 15m. Region of Ontario and State of Washington are separated by a distance of 3306 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    C$ 158 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on United Airlines and Air Canada, with prices starting from C$ 212 and C$ 213, respectively.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Region of Ontario to State of Washington (average of C$ 262). Flying from Region of Ontario to State of Washington in December is currently the most expensive (average of C$ 353). 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 Ontario to Washington

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

Discover the top 6 airlines that operate flights from Ontario to Washington. 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 15 September 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 183AverageC$ 449FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 278AverageC$ 550FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Alaska AirlinesCheapestC$ 323AverageC$ 519FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 344AverageC$ 559FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
DeltaCheapestC$ 378AverageC$ 533FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Hawaiian AirlinesCheapestC$ 412AverageC$ 465FlexibilityNo cancel feeOn-time85%
Search Hawaiian 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 Ontario to Washington?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario to Washington. 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 Ontario to Washington?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Washington from Ontario.

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

Need flexible booking options for your flight to Washington from Ontario? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Of course! You can now track prices for flights from Ontario to Washington 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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