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Cheap flights from Ontario to Washington from C$ 190

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 15/1. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
14 Jan — 21 Jan1
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 15 December 2025.

Fri 26/121:30 p.m.YYZ - SEA
1 stop10h 16mMultiple Airlines
Wed 7/17:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Deal found 14/12C$ 610
Sun 14/127:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Sat 17/111:55 a.m.SEA - YYZ
2 stops8h 44mWestJet
Deal found 13/12C$ 613
Tue 30/122:50 p.m.YYZ - SEA
1 stop11h 22mUnited Airlines
Tue 6/13:30 p.m.SEA - YYZ
2 stops15h 16mUnited Airlines
Deal found 14/12C$ 631
Sun 14/128:20 p.m.YYZ - SEA
2 stops18h 33mMultiple Airlines
Sat 17/17:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Deal found 13/12C$ 636
Sat 13/126:30 p.m.YYZ - SEA
1 stop22h 50mWestJet
Fri 13/33:10 p.m.SEA - YYZ
2 stops11h 48mWestJet
Deal found 12/12C$ 653
Fri 26/121:30 p.m.YYZ - SEA
1 stop10h 16mWestJet
Wed 7/13:10 p.m.SEA - YYZ
1 stop29h 01mWestJet
Deal found 14/12C$ 686
Fri 26/1210:00 a.m.YYZ - SEA
1 stop13h 57mUnited Airlines
Wed 7/111:45 p.m.SEA - YYZ
1 stop9h 03mUnited Airlines
Deal found 15/12C$ 687
Wed 17/121:30 p.m.YYZ - SEA
1 stop10h 20mMultiple Airlines
Wed 14/17:55 a.m.SEA - YYZ
Nonstop4h 40mMultiple Airlines
Deal found 13/12C$ 693
Thu 25/125:25 p.m.YUL - PDX
1 stop8h 34mUnited Airlines
Thu 1/16:27 p.m.PDX - YUL
2 stops17h 49mUnited Airlines
Deal found 14/12C$ 697
Tue 30/1210:00 a.m.YYZ - PDX
2 stops15h 59mUnited Airlines
Fri 2/17:10 a.m.PDX - YYZ
1 stop13h 49mUnited Airlines
Deal found 13/12C$ 705
Thu 18/127:00 a.m.YUL - PDX
2 stops18h 59mUnited Airlines
Thu 25/126:27 p.m.PDX - YUL
2 stops16h 33mUnited Airlines
Deal found 13/12C$ 706
Mon 29/126:10 a.m.YYZ - PDX
1 stop16h 33mUnited Airlines
Mon 5/111:59 p.m.PDX - YYZ
1 stop8h 21mUnited Airlines
Deal found 14/12C$ 735

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 15 December 2025.

Round-trip from

C$ 273

One-way from

C$ 190

Popular in

December

Cheapest in

February

Average price

C$ 618

Good round-trip deal

C$ 324 or less

Good one-way deal

C$ 252 or less
WestJet
  • WestJet
  • 23/5-1/6
  • 3 total stops
  • 20h 33m total
  • Ontario to Washington
Search Deals
15/1
  • 15/1
  • 2 total stops
  • 25h 03m total
  • Ontario to Washington
Search Deals
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 15 December 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

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 22/5

12:00 p.m.-8:28 p.m.

2 stops11h 28m

Seattle/Tacoma Intl

Mon 25/5

7:05 a.m.-9:00 p.m.

2 stops10h 55m

C$ 282

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sat 24/1

4:45 p.m.-7:17 p.m.

Nonstop5h 32m

Seattle/Tacoma Intl

Sat 31/1

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

Nonstop4h 40m

C$ 291

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 15/1

4:45 p.m.-7:17 p.m.

Nonstop5h 32m

Seattle/Tacoma Intl

Sun 18/1

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

Nonstop4h 40m

C$ 292

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 22/1

4:45 p.m.-7:17 p.m.

Nonstop5h 32m

Seattle/Tacoma Intl

Sun 25/1

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

Nonstop4h 40m

C$ 292

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 5/5

9:00 a.m.-8:28 p.m.

2 stops14h 28m

Seattle/Tacoma Intl

Sun 24/5

7:05 a.m.-9:00 p.m.

2 stops10h 55m

C$ 293

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 28/1

7:45 a.m.-2:20 p.m.

1 stop9h 35m

Seattle/Tacoma Intl

Wed 4/2

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

Nonstop4h 40m

C$ 296

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 13/1

4:45 p.m.-7:17 p.m.

Nonstop5h 32m

Seattle/Tacoma Intl

Fri 6/2

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

Nonstop4h 40m

C$ 300

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 16/1

7:50 p.m.-10:16 p.m.

Nonstop5h 26m

Seattle/Tacoma Intl

Sat 24/1

8:10 a.m.-3:53 p.m.

Nonstop4h 43m

C$ 302

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 23/1

4:45 p.m.-7:17 p.m.

Nonstop5h 32m

Seattle/Tacoma Intl

Mon 26/1

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

Nonstop4h 40m

C$ 313

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 27/2

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

Nonstop5h 33m

Seattle/Tacoma Intl

Mon 2/3

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

Nonstop4h 40m

C$ 313

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/12

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$ 183). Flying from Region of Ontario to State of Washington in June is currently the most expensive (average of C$ 343). 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 December 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 21% on flights from Region of Ontario to State of Washington by exploring options for tickets in the evening.

What is the cheapest day to fly from Region of Ontario to State of Washington?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Washington. Price data was last updated on 16 December 2024.

Travelers seeking maximum savings on their Region of Ontario to State of Washington flight should consider departing on Thursday evenings when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 2025.

The most flights from CAON to USWA are scheduled on a Monday (7 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (2 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 15 December 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
11,452 reviews
Check prices

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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
11,452 reviews
Alaska Airlines
8.0
Very good
11,452 reviews
Check prices

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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
8,008 reviews
Alaska Airlines
8.0
Very good
11,452 reviews
Check prices

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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
9,092 reviews
Alaska Airlines
8.0
Very good
11,452 reviews
Check prices

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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
3,202 reviews
Alaska Airlines
8.0
Very good
11,452 reviews
Check prices

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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
10,525 reviews
Alaska Airlines
8.0
Very good
11,452 reviews
Check prices

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Crew

8.5

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$ 291, WestJet can have you in State of Washington from Region of Ontario in 5h 32m. 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$ 183). Flying from Region of Ontario to State of Washington in June is currently the most expensive (average of C$ 343). 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 December 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 182AverageC$ 422FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 277AverageC$ 537FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Alaska AirlinesCheapestC$ 283AverageC$ 472FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 336AverageC$ 538FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
DeltaCheapestC$ 341AverageC$ 525FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Hawaiian AirlinesCheapestC$ 409AverageC$ 462FlexibilityNo 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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