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$93+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
apr. 5 — apr. 121
lør. 4/5
lør. 4/12
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 marts 31, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$247
(Trip.com)

One-way from

$93
(Kiwi.com)

Popular in

April

Cheapest in

January

Average price

$369

Good round-trip deal

$472 or less

Good one-way deal

$204 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. 8% potential increase in price ($43 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in March 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 marts 31, 2025.

This Trip.com deal was found by Cheapflights users on 3/30. 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.
tir. 5/132:05 pmSEA - YKF
1 stop7h 41mWestJet
tir. 5/206:00 amYKF - SEA
1 stop9h 58mWestJet
Deal found 3/30$247
This Kiwi.com deal was found by Cheapflights users on 3/30. 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.
tir. 4/2912:30 pmSEA - YYZ
1 stop14h 25mMultiple Airlines
tir. 5/67:00 amYYZ - SEA
1 stop20h 56mMultiple Airlines
Deal found 3/30$248
This Mytrip deal was found by Cheapflights users on 3/30. 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.
tir. 4/2912:30 pmSEA - YKF
2 stops33h 16mMultiple Airlines
tir. 5/66:00 amYKF - SEA
1 stop9h 58mMultiple Airlines
Deal found 3/30$253
This Kiwi.com deal was found by Cheapflights users on 3/30. 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.
fre. 5/301:50 pmSEA - YYZ
1 stop7h 34mWestJet
man. 6/28:00 amYYZ - SEA
1 stop7h 58mWestJet
Deal found 3/30$267
This Trip.com deal was found by Cheapflights users on 3/30. 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.
tor. 5/297:05 amSEA - YOW
1 stop8h 16mWestJet
tir. 6/36:00 amYOW - SEA
1 stop9h 58mWestJet
Deal found 3/30$269
This Kiwi.com deal was found by Cheapflights users on 3/30. 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.
tir. 4/292:32 pmPDX - YYZ
2 stops13h 20mMultiple Airlines
tir. 5/61:50 pmYYZ - PDX
1 stop25h 52mMultiple Airlines
Deal found 3/30$272
This Kiwi.com deal was found by Cheapflights users on 3/29. 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.
tir. 4/292:05 pmSEA - YUL
1 stop7h 38mWestJet
tir. 5/67:00 amYUL - SEA
1 stop8h 58mWestJet
Deal found 3/29$287
This Trip.com deal was found by Cheapflights users on 3/30. 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.
tor. 8/141:50 pmSEA - YHM
1 stop7h 51mWestJet
søn. 8/246:00 amYHM - SEA
1 stop9h 58mWestJet
Deal found 3/30$293
This Mytrip deal was found by Cheapflights users on 3/30. 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.
tor. 5/297:05 amSEA - YOW
1 stop8h 16mMultiple Airlines
tir. 6/33:35 pmYOW - SEA
2 stops25h 50mMultiple Airlines
Deal found 3/30$293
This Kiwi.com deal was found by Cheapflights users on 3/30. 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.
tir. 5/133:20 pmSEA - YHM
2 stops30h 21mMultiple Airlines
tir. 5/206:00 amYHM - SEA
1 stop9h 58mMultiple Airlines
Deal found 3/30$296
This Trip.com deal was found by Cheapflights users on 3/30. 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.
tir. 5/277:05 amSEA - YUL
2 stops14h 32mMultiple Airlines
tor. 5/297:00 amYUL - SEA
1 stop8h 58mMultiple Airlines
Deal found 3/30$304
This Gotogate deal was found by Cheapflights users on 3/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
tor. 6/51:45 pmPDX - YUL
1 stop7h 58mWestJet
man. 6/97:00 amYUL - PDX
1 stop8h 52mWestJet
Deal found 3/30$313

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 marts 31, 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

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

tir. 5/13

2:05 pm-12:46 am

1 stop7h 41m

Toronto Region of Waterloo Intl

tir. 5/20

6:00 am-12:58 pm

1 stop9h 58m

$247

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

tir. 4/29

12:30 pm-5:55 am

1 stop14h 25m

Toronto Pearson Intl

tir. 5/6

7:00 am-12:56 am

1 stop20h 56m

$248

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

tir. 4/29

12:30 pm-12:46 am

2 stops33h 16m

Toronto Region of Waterloo Intl

tir. 5/6

6:00 am-12:58 pm

1 stop9h 58m

$253

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

fre. 5/30

1:50 pm-12:24 am

1 stop7h 34m

Toronto Pearson Intl

man. 6/2

8:00 am-12:58 pm

1 stop7h 58m

$267

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

tor. 5/29

7:05 am-6:21 pm

1 stop8h 16m

Ottawa

tir. 6/3

6:00 am-12:58 pm

1 stop9h 58m

$269

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

tir. 4/29

2:32 pm-6:52 am

2 stops13h 20m

Toronto Pearson Intl

tir. 5/6

1:50 pm-12:42 pm

1 stop25h 52m

$272

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

tir. 4/29

2:05 pm-12:43 am

1 stop7h 38m

Montreal Pierre Elliott Trudeau Intl

tir. 5/6

7:00 am-12:58 pm

1 stop8h 58m

$287

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

tor. 5/29

7:05 am-6:21 pm

1 stop8h 16m

Ottawa

tir. 6/3

3:35 pm-2:25 pm

2 stops25h 50m

$293

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

tor. 8/14

1:50 pm-12:41 am

1 stop7h 51m

Hamilton

søn. 8/24

6:00 am-12:58 pm

1 stop9h 58m

$293

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

tir. 5/13

3:20 pm-12:41 am

2 stops30h 21m

Hamilton

tir. 5/20

6:00 am-12:58 pm

1 stop9h 58m

$296

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

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 marts 31, 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 marts 31, 2025.

The most flights from USWA to CAON are scheduled on a Monday (6 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 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 marts 31, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta and Hawaiian 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
9,818 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,818 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,899 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,342 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,614 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,818 reviews

Boarding

8.2

Crew

8.5

Entertainment

7.1

Overall

8.0

Comfort

7.9

Food

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 $116. Air Canada flights start at $151 while deals on Alaska Airlines start at $161 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 marts 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$136Average$486FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$158Average$684FlexibilityNo cancel feeOn-time69%
WestJetCheapest$235Average$480FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$248Average$528FlexibilityNo cancel feeOn-time75%
DeltaCheapest$359Average$566FlexibilityNo cancel feeOn-timeN/A
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