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Cheap flights from Ontario to Washington from C$ 180

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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
27 Feb — 6 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Washington

Enter your travel dates to find the best prices.

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 28 January 2026.

Sat 7/34:45 p.m.
YYZ
-
SEA
Nonstop5h 33m
Alaska Airlines
Sat 14/37:55 a.m.
SEA
-
YYZ
Nonstop4h 40m
Alaska Airlines
Deal found 28/1C$ 286
Tue 17/27:50 p.m.
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Wed 18/28:00 a.m.
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Deal found 26/1C$ 299
Tue 17/27:50 p.m.
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Tue 24/28:00 p.m.
SEA
-
YYZ
1 stop7h 29m
Air Canada
Deal found 26/1C$ 308
Wed 18/27:50 p.m.
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Tue 24/28:00 p.m.
SEA
-
YYZ
1 stop7h 29m
Air Canada
Deal found 27/1C$ 310
Sun 15/27:50 p.m.
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Fri 20/28:00 a.m.
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Deal found 25/1C$ 312
Thu 7/54:55 p.m.
YYZ
-
SEA
Nonstop5h 28m
Alaska Airlines
Wed 13/57:59 a.m.
SEA
-
YYZ
Nonstop4h 46m
Alaska Airlines
Deal found 27/1C$ 313
Tue 17/27:50 p.m.
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Thu 19/28:00 a.m.
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Deal found 27/1C$ 314
Mon 16/27:50 p.m.
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Tue 24/28:00 p.m.
SEA
-
YYZ
1 stop7h 29m
Air Canada
Deal found 26/1C$ 317
Fri 8/51:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Sun 10/57:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 27/1C$ 318
Thu 5/37:30 p.m.
YUL
-
SEA
1 stop21h 49m
WestJet
Fri 5/67:35 p.m.
SEA
-
YUL
1 stop8h 25m
WestJet
Deal found 27/1C$ 353
Thu 7/58:00 p.m.
YUL
-
SEA
1 stop16h 40m
WestJet
Sun 10/57:35 p.m.
SEA
-
YUL
1 stop8h 25m
WestJet
Deal found 28/1C$ 355
Wed 13/56:45 a.m.
YUL
-
SEA
2 stops15h 00m
WestJet
Sat 23/57:35 p.m.
SEA
-
YUL
1 stop8h 25m
WestJet
Deal found 27/1C$ 362

Find flight deals from Ontario to Washington

Keep the following information in mind while searching for Ontario to Washington flight deals. Data was last updated 28 January 2026.

Round-trip from

C$ 286

One-way from

C$ 180

Popular in

June

Cheapest in

February

Average price

C$ 544

Good round-trip deal

C$ 342 or less

Good one-way deal

C$ 250 or less
Alaska Airlines
  • Alaska Airlines
  • 7/3-14/3
  • Nonstop
  • 10h 13m total
  • Ontario to Washington
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 4/3
  • Nonstop
  • 5h 33m total
  • Ontario to Washington
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (C$ 61 potential increase over avg. RT price).
Search Deals
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 January 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Washington.
Search Deals
Price to beat on a one-way flight from Ontario to Washington.
Search Deals

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 28 January 2026.
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

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/3

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

Nonstop5h 33m

Seattle/Tacoma Intl

Fri 6/3

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

Nonstop4h 40m

C$ 314

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 19/2

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

Nonstop5h 33m

Seattle/Tacoma Intl

Mon 23/2

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

Nonstop4h 40m

C$ 325

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 18/2

5:30 p.m.-10:43 p.m.

1 stop8h 13m

Seattle/Tacoma Intl

Tue 24/2

7:00 a.m.-7:45 p.m.

1 stop9h 45m

C$ 336

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 25/2

5:30 p.m.-10:43 p.m.

1 stop8h 13m

Seattle/Tacoma Intl

Wed 4/3

7:00 a.m.-7:45 p.m.

1 stop9h 45m

C$ 336

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 17/2

8:45 a.m.-7:03 p.m.

1 stop13h 18m

Seattle/Tacoma Intl

Tue 24/2

9:00 a.m.-11:59 p.m.

2 stops11h 59m

C$ 338

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 19/2

4:10 p.m.-10:59 p.m.

1 stop9h 49m

Seattle/Tacoma Intl

Tue 24/2

9:00 a.m.-11:46 p.m.

2 stops11h 46m

C$ 347

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 19/2

4:10 p.m.-10:59 p.m.

1 stop9h 49m

Seattle/Tacoma Intl

Sat 28/2

11:59 p.m.-9:58 a.m.

1 stop6h 59m

C$ 349

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 10/3

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

Nonstop5h 33m

Seattle/Tacoma Intl

Thu 12/3

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

Nonstop4h 40m

C$ 350

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 17/2

8:45 a.m.-7:03 p.m.

1 stop13h 18m

Seattle/Tacoma Intl

Mon 23/2

9:19 a.m.-11:59 p.m.

2 stops11h 40m

C$ 358

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Mon 23/2

7:40 p.m.-9:49 a.m.

2 stops17h 09m

Seattle/Tacoma Intl

Mon 2/3

7:29 p.m.-4:52 p.m.

1 stop18h 23m

C$ 358

Flights are sorted by cheapest round-trip flights first.

Deals found on 26/1

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, December is the cheapest month in which you can book a flight from Region of Ontario to State of Washington (average of C$ 179). Flying from Region of Ontario to State of Washington in August is currently the most expensive (average of C$ 305). 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 28 January 2026.

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 28 January 2026.

The most flights from CAON to USWA are scheduled on a Monday (9 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (5 on average).

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 28 January 2026.
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
11,801 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,801 reviews
Alaska Airlines
8.0
Very good
11,801 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,123 reviews
Alaska Airlines
8.0
Very good
11,801 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
United Airlines
7.4
Good
9,209 reviews
Alaska Airlines
8.0
Very good
11,801 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
WestJet
7.2
Good
3,251 reviews
Alaska Airlines
8.0
Very good
11,801 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Air Canada
7.1
Good
10,666 reviews
Alaska Airlines
8.0
Very good
11,801 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

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$ 314, Alaska Airlines can have you in State of Washington from Region of Ontario in 5h 33m. 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.

  • 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, December is the cheapest month in which you can book a flight from Region of Ontario to State of Washington (average of C$ 179). Flying from Region of Ontario to State of Washington in August is currently the most expensive (average of C$ 305). 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 28 January 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 126AverageC$ 418FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 239AverageC$ 519FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
United AirlinesCheapestC$ 262AverageC$ 529FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Alaska AirlinesCheapestC$ 271AverageC$ 465FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 324AverageC$ 540FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Hawaiian AirlinesCheapestC$ 406AverageC$ 459FlexibilityNo 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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