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$68+ 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 5/30. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$172
(Trip.com)

One-way from

$68
(Gotogate)

Popular in

June

Cheapest in

January

Average price

$445

Good round-trip deal

$426 or less

Good one-way deal

$193 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Toronto (YTO) flights.
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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. 14% potential increase in price ($74 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 17, 2025.

This Trip.com deal was found by Cheapflights users on 4/16. 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 5/291:50 pmSEA - YHM
1 stop7h 51mWestJet
Mon 6/26:00 amYHM - SEA
1 stop9h 58mWestJet
Deal found 4/16$172
This Kiwi.com deal was found by Cheapflights users on 4/15. 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.
Wed 5/281:37 pmPDX - YYZ
2 stops13h 37mMultiple Airlines
Wed 6/49:45 amYYZ - PDX
1 stop10h 00mMultiple Airlines
Deal found 4/15$223
This Kiwi.com deal was found by Cheapflights users on 4/17. 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 5/28:56 pmSEA - YHM
2 stops24h 45mMultiple Airlines
Sun 5/116:00 amYHM - SEA
1 stop9h 58mMultiple Airlines
Deal found 4/17$227
This Trip.com deal was found by Cheapflights users on 4/16. 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 7/41:45 pmPDX - YYZ
1 stop7h 39mWestJet
Sun 7/138:00 amYYZ - PDX
1 stop7h 52mWestJet
Deal found 4/16$232
This Trip.com deal was found by Cheapflights users on 4/16. 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.
Sat 5/311:45 pmPDX - YOW
1 stop7h 57mWestJet
Sat 6/76:10 amYOW - PDX
2 stops9h 42mWestJet
Deal found 4/16$268
This Kiwi.com deal was found by Cheapflights users on 4/17. 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.
Tue 8/262:05 pmSEA - YYZ
1 stop7h 19mWestJet
Thu 8/289:00 amYYZ - SEA
2 stops12h 38mWestJet
Deal found 4/17$271
This Mytrip deal was found by Cheapflights users on 4/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/126:00 amSEA - YYZ
3 stops20h 51mMultiple Airlines
Tue 5/208:35 pmYYZ - SEA
1 stop30h 35mMultiple Airlines
Deal found 4/16$272
This Flightnetwork deal was found by Cheapflights users on 4/16. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/12:05 pmSEA - YOW
2 stops12h 20mMultiple Airlines
Sat 6/72:25 pmYOW - SEA
1 stop9h 12mMultiple Airlines
Deal found 4/16$274
This Justfly.com deal was found by Cheapflights users on 4/17. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/241:45 pmPDX - YUL
1 stop7h 58mWestJet
Tue 7/297:00 amYUL - PDX
1 stop8h 52mWestJet
Deal found 4/17$275
This flugladen.de deal was found by Cheapflights users on 4/16. 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.
Sun 6/12:05 pmSEA - YOW
2 stops12h 20mWestJet
Sat 6/73:45 pmYOW - SEA
1 stop7h 43mWestJet
Deal found 4/16$278
This Flightnetwork deal was found by Cheapflights users on 4/17. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/15:35 amSEA - YOW
2 stops10h 51mAir Canada
Sun 6/82:25 pmYOW - SEA
1 stop9h 12mAir Canada
Deal found 4/17$279
This Trip.com deal was found by Cheapflights users on 4/16. 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 9/51:50 pmSEA - YKF
1 stop7h 55mWestJet
Tue 9/96:00 amYKF - SEA
1 stop9h 59mWestJet
Deal found 4/16$281

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 April 17, 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

Thu 5/29

1:50 pm-12:41 am

1 stop7h 51m

Hamilton

Mon 6/2

6:00 am-12:58 pm

1 stop9h 58m

$172

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

Wed 5/28

1:37 pm-6:14 am

2 stops13h 37m

Toronto Pearson Intl

Wed 6/4

9:45 am-4:45 pm

1 stop10h 00m

$223

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Fri 5/2

8:56 pm-12:41 am

2 stops24h 45m

Hamilton

Sun 5/11

6:00 am-12:58 pm

1 stop9h 58m

$227

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

Fri 7/4

1:45 pm-12:24 am

1 stop7h 39m

Toronto Pearson Intl

Sun 7/13

8:00 am-12:52 pm

1 stop7h 52m

$232

PortlandOttawa

PDX - YOW

PDXYOW

Portland

Sat 5/31

1:45 pm-12:42 am

1 stop7h 57m

Ottawa

Sat 6/7

6:10 am-12:52 pm

2 stops9h 42m

$268

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 8/26

2:05 pm-12:24 am

1 stop7h 19m

Toronto Pearson Intl

Thu 8/28

9:00 am-6:38 pm

2 stops12h 38m

$271

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 5/12

6:00 am-5:51 am

3 stops20h 51m

Toronto Pearson Intl

Tue 5/20

8:35 pm-12:10 am

1 stop30h 35m

$272

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Sun 6/1

2:05 pm-5:25 am

2 stops12h 20m

Ottawa

Sat 6/7

2:25 pm-8:37 pm

1 stop9h 12m

$274

PortlandMontreal

PDX - YUL

PDXYUL

Portland

Thu 7/24

1:45 pm-12:43 am

1 stop7h 58m

Montreal Pierre Elliott Trudeau Intl

Tue 7/29

7:00 am-12:52 pm

1 stop8h 52m

$275

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Sun 6/1

2:05 pm-5:25 am

2 stops12h 20m

Ottawa

Sat 6/7

3:45 pm-8:28 pm

1 stop7h 43m

$278

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

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 July is currently the most expensive (average of $359). 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 April 17, 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 April 17, 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 (3 on average).

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

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 April 17, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and United Airlines from Washington to Ontario. 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
9,882 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,882 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,917 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,667 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
WestJet
7.2
Good
2,809 reviews
Alaska Airlines
8.0
Very good
9,882 reviews

Boarding

8.2

Crew

8.5

Food

7.1

Entertainment

7.1

Comfort

7.9

Overall

8.0

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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.

  • 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 $68. American Airlines flights start at $129 while deals on Air Canada start at $130 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 July is currently the most expensive (average of $359). 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$136Average$470FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$158Average$683FlexibilityNo cancel feeOn-time69%
WestJetCheapest$235Average$455FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$250Average$524FlexibilityNo cancel feeOn-time75%
DeltaCheapest$359Average$500FlexibilityNo cancel feeOn-timeN/A

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