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Cheap flights from Washington to Ontario from C$ 109

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 14/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
15 Oct — 22 Oct1
1 adult
1 adult, Economy

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 15 September 2025.

Round-trip from

C$ 304

One-way from

C$ 109

Popular in

June

Cheapest in

January

Average price

C$ 568

Good round-trip deal

C$ 608 or less

Good one-way deal

C$ 291 or less
WestJet
  • WestJet
  • 14/10-21/10
  • 2 total stops
  • 17h 34m total
  • Washington to Ontario
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WestJet
  • WestJet
  • 14/10
  • 1 total stop
  • 7h 35m total
  • Washington to Ontario
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (C$ 132 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Washington to Ontario.
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Price to beat on a one-way flight from Washington to Ontario.
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Find flight deals from Washington to Ontario

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 15 September 2025.

Tue 14/102:05 p.m.SEA - YHM
1 stop7h 35mWestJet
Tue 21/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 14/9C$ 304
Sun 12/108:40 a.m.SEA - YHM
1 stop13h 00mWestJet
Wed 15/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 15/9C$ 325
Sat 11/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Tue 21/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 14/9C$ 332
Sun 12/108:40 a.m.SEA - YHM
1 stop13h 00mWestJet
Tue 21/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 14/9C$ 340
Sat 11/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Mon 20/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 14/9C$ 348
Tue 7/1010:00 a.m.SEA - YYZ
1 stop7h 30mAir Canada
Wed 22/107:30 p.m.YYZ - SEA
Nonstop5h 15mAir Canada
Deal found 14/9C$ 354
Fri 17/101:50 p.m.SEA - YYZ
1 stop7h 15mMultiple Airlines
Sat 25/108:00 a.m.YYZ - SEA
1 stop7h 59mMultiple Airlines
Deal found 13/9C$ 355
Tue 21/107:05 a.m.SEA - YHM
1 stop14h 35mWestJet
Sat 25/106:00 a.m.YHM - SEA
1 stop9h 59mWestJet
Deal found 14/9C$ 355
Fri 24/101:50 p.m.SEA - YKF
1 stop7h 55mWestJet
Tue 28/106:20 a.m.YKF - SEA
1 stop11h 00mWestJet
Deal found 14/9C$ 355
Fri 17/108:40 a.m.SEA - YYZ
2 stops12h 51mWestJet
Sat 1/116:30 a.m.YYZ - SEA
1 stop11h 08mWestJet
Deal found 14/9C$ 356
Thu 23/101:50 p.m.SEA - YHM
1 stop7h 50mWestJet
Sun 26/106:10 p.m.YHM - SEA
1 stop23h 10mWestJet
Deal found 15/9C$ 356
Sun 19/108:40 a.m.SEA - YYZ
2 stops12h 51mWestJet
Fri 31/107:45 a.m.YYZ - SEA
1 stop9h 35mWestJet
Deal found 14/9C$ 358

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 15 September 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

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 12/10

8:40 a.m.-12:40 a.m.

1 stop13h 00m

Hamilton

Wed 15/10

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

1 stop9h 59m

C$ 325

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 11/10

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

1 stop7h 50m

Hamilton

Tue 21/10

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

1 stop9h 59m

C$ 332

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Tue 10/3

1:55 p.m.-10:07 a.m.

2 stops17h 12m

Ottawa

Wed 11/3

2:05 p.m.-12:51 a.m.

2 stops13h 46m

C$ 337

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 12/10

8:40 a.m.-12:40 a.m.

1 stop13h 00m

Hamilton

Tue 21/10

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

1 stop9h 59m

C$ 340

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 24/10

1:50 p.m.-12:45 a.m.

1 stop7h 55m

Toronto Region of Waterloo Intl

Tue 28/10

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

1 stop11h 00m

C$ 355

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 6/12

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

Nonstop4h 40m

Toronto Pearson Intl

Thu 8/1

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

Nonstop5h 20m

C$ 362

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 24/10

7:18 a.m.-3:00 p.m.

Nonstop4h 42m

Toronto Pearson Intl

Tue 28/10

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

Nonstop5h 20m

C$ 362

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Sat 11/10

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

1 stop7h 50m

Ottawa

Wed 15/10

5:55 a.m.-12:59 p.m.

2 stops10h 04m

C$ 365

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Fri 17/10

8:40 a.m.-12:22 a.m.

2 stops12h 42m

Ottawa

Mon 20/10

5:55 a.m.-12:59 p.m.

2 stops10h 04m

C$ 372

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 10/1

2:10 p.m.-11:59 p.m.

1 stop6h 49m

Toronto Pearson Intl

Fri 16/1

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

Nonstop5h 26m

C$ 376

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 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, January 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 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 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 15 September 2025.

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

Weekly flight availability from State of Washington to Region of Ontario

Explore weekly flight availability from Washington 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 15 September 2025.

The most flights from USWA to CAON are scheduled on a Thursday (7 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).

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 15 September 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
10,000 reviews
Check prices

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,929 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
WestJet
7.2
Good
3,091 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Air Canada
7.1
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews
Check prices

Comfort

7.8

Overall

8.0

Food

7.1

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

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 WestJet, United Airlines, or Alaska Airlines 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$ 109), United Airlines (C$ 167), and Air Canada (C$ 169).

  • 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, January 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 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.

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 15 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 191AverageC$ 527FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 323AverageC$ 482FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 392AverageC$ 773FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 480AverageC$ 636FlexibilityNo 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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