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$79+ Cheap flights from Washington to Ontario

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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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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 September 15, 2025.

Round-trip from

$216
(Trip.com)

One-way from

$79
(Trip.com)

Popular in

June

Cheapest in

January

Average price

$411

Good round-trip deal

$398 or less

Good one-way deal

$154 or less
From Washington to Ontario
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One-way flight from Washington to Ontario
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Highest demand for flights based on searches. 15% potential increase in price ($70 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 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 September 15, 2025.

This Trip.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/171:50 pmSEA - YHM
1 stop7h 50mWestJet
Tue 10/216:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/13$216
This oojo deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/142:05 pmSEA - YHM
1 stop7h 35mWestJet
Tue 10/216:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/14$220
This flugladen.de deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/161:50 pmSEA - YHM
1 stop7h 50mWestJet
Wed 10/226:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/12$221
This Trip.com deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/171:50 pmSEA - YHM
1 stop7h 50mWestJet
Mon 10/206:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/12$227
This FlightHub deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/111:50 pmSEA - YHM
1 stop7h 50mWestJet
Tue 10/216:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/14$240
This oojo deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/128:40 amSEA - YHM
1 stop13h 00mWestJet
Tue 10/216:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/14$246
This FlightHub deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/161:50 pmSEA - YHM
1 stop7h 50mWestJet
Tue 10/216:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/12$251
This FlightHub deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/111:50 pmSEA - YHM
1 stop7h 50mWestJet
Mon 10/206:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/14$252
This Trip.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/231:50 pmSEA - YHM
1 stop7h 50mWestJet
Sun 10/266:10 pmYHM - SEA
1 stop23h 10mWestJet
Deal found 9/13$254
This Air Canada deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/710:00 amSEA - YYZ
1 stop7h 30mAir Canada
Tue 10/217:30 pmYYZ - SEA
Nonstop5h 15mAir Canada
Deal found 9/14$256
This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/171:50 pmSEA - YYZ
1 stop7h 15mMultiple Airlines
Sat 10/258:00 amYYZ - SEA
1 stop7h 59mMultiple Airlines
Deal found 9/13$257
This oojo deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/217:05 amSEA - YHM
1 stop14h 35mWestJet
Sat 10/256:00 amYHM - SEA
1 stop9h 59mWestJet
Deal found 9/12$257

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 2,558,603 searches. Data last updated September 15, 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

Fri 10/17

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

Tue 10/21

6:00 am-12:59 pm

1 stop9h 59m

$216

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 10/16

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

Tue 10/21

6:00 am-12:59 pm

1 stop9h 59m

$216

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Tue 3/10

11:50 pm-10:07 am

1 stop7h 17m

Ottawa

Wed 3/11

2:05 pm-12:51 am

2 stops13h 46m

$238

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sat 10/11

1:50 pm-12:40 am

1 stop7h 50m

Hamilton

Tue 10/21

6:00 am-12:59 pm

1 stop9h 59m

$240

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Sun 10/12

8:40 am-12:40 am

1 stop13h 00m

Hamilton

Tue 10/21

6:00 am-12:59 pm

1 stop9h 59m

$246

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 10/24

1:50 pm-12:45 am

1 stop7h 55m

Toronto Region of Waterloo Intl

Tue 10/28

6:20 am-2:20 pm

1 stop11h 00m

$257

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 12/6

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Thu 1/8

4:45 pm-7:05 pm

Nonstop5h 20m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 10/24

7:18 am-3:00 pm

Nonstop4h 42m

Toronto Pearson Intl

Tue 10/28

4:45 pm-7:05 pm

Nonstop5h 20m

$262

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Sat 10/11

1:50 pm-12:40 am

1 stop7h 50m

Ottawa

Wed 10/15

5:55 am-12:59 pm

2 stops10h 04m

$264

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Fri 10/17

8:40 am-12:22 am

2 stops12h 42m

Ottawa

Mon 10/20

6:00 am-12:59 pm

1 stop9h 59m

$264

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/12

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 $243). Flying from State of Washington to Region of Ontario in August is currently the most expensive (average of $348). 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 September 15, 2025.

When flying from State of Washington to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 September 15, 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 September 15, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and United Airlines from Washington to Ontario 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

Entertainment

7.0

Overall

8.0

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

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

Entertainment

7.0

Overall

8.0

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

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.
Delta
8.0
Very good
7,956 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Overall

8.0

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

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
8,931 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Overall

8.0

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

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

Entertainment

7.0

Overall

8.0

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

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

Entertainment

7.0

Overall

8.0

Crew

8.5

Food

7.1

Comfort

7.8

Boarding

8.1

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?

    Departing from State of Washington to Region of Ontario will take you 4h 40m. State of Washington and Region of Ontario are separated by a distance of 2054 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at $79. Air Canada flights start at $122 while deals on United Airlines start at $126 one-way.

  • 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 $243). Flying from State of Washington to Region of Ontario in August is currently the most expensive (average of $348). 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 5 airlines flying from Washington to Ontario

Discover the top 5 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 2,558,603 searches. Data last updated September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$128Average$557FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$160Average$683FlexibilityNo cancel feeOn-time69%
DeltaCheapest$170Average$399FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$235Average$353FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$276Average$504FlexibilityNo cancel feeOn-time75%

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