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$101+ 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 11/29. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 October 30, 2025.

This SmartFares deal was found by Cheapflights users on 10/27. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/297:57 amSEA - YYZ
Nonstop4h 38mAlaska Airlines
Tue 12/24:45 pmYYZ - SEA
Nonstop5h 33mAlaska Airlines
Deal found 10/27$229
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Sat 11/2911:55 amSEA - YYZ
2 stops8h 44mWestJet
Tue 12/27:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 10/27$232
This Trip.com deal was found by Cheapflights users on 10/27. 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 12/123:10 pmSEA - YYZ
2 stops11h 48mWestJet
Tue 12/167:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 10/27$239
This Kiwi.com deal was found by Cheapflights users on 10/28. 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.
Thu 12/43:10 pmSEA - YYZ
2 stops11h 48mWestJet
Sun 12/77:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 10/28$243
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Sat 11/297:57 amSEA - YYZ
Nonstop4h 38mMultiple Airlines
Tue 12/27:45 amYYZ - SEA
1 stop9h 35mMultiple Airlines
Deal found 10/27$245
This Booking.com deal was found by Cheapflights users on 10/28. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/63:20 pmSEA - YYZ
2 stops11h 38mMultiple Airlines
Sat 12/137:50 pmYYZ - SEA
Nonstop5h 26mMultiple Airlines
Deal found 10/28$246
This Trip.com deal was found by Cheapflights users on 10/30. 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.
Fri 11/2111:55 amSEA - YYZ
2 stops8h 44mMultiple Airlines
Mon 11/244:45 pmYYZ - SEA
Nonstop5h 32mMultiple Airlines
Deal found 10/30$247
This Booking.com deal was found by Cheapflights users on 10/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/298:10 amSEA - YYZ
Nonstop4h 43mAir Canada
Sat 12/67:50 pmYYZ - SEA
Nonstop5h 26mAir Canada
Deal found 10/30$248
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Fri 11/2811:55 amSEA - YYZ
1 stop16h 03mWestJet
Tue 12/27:45 amYYZ - SEA
1 stop9h 35mWestJet
Deal found 10/29$249
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/297:57 amSEA - YYZ
Nonstop4h 38mAlaska Airlines
Wed 12/34:45 pmYYZ - SEA
Nonstop5h 33mAlaska Airlines
Deal found 10/29$251
This oojo deal was found by Cheapflights users on 10/28. 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 11/253:10 pmSEA - YOW
1 stop22h 43mWestJet
Tue 12/25:40 amYOW - SEA
2 stops11h 40mWestJet
Deal found 10/28$315
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1111:12 pmPDX - YYZ
1 stop9h 36mUnited Airlines
Wed 11/123:45 pmYYZ - PDX
1 stop10h 00mUnited Airlines
Deal found 10/27$317

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 October 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$226
(Kiwi.com)

One-way from

$101
(Alaska Airlines)

Popular in

June

Cheapest in

January

Average price

$442

Good round-trip deal

$342 or less

Good one-way deal

$262 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Toronto (YTO) flights.
Search Deals
From Washington to Ontario
Search Deals
One-way flight from Washington to Ontario
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($66 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Washington to Ontario.
Search Deals
Price to beat on a one-way flight from Washington to Ontario.
Search Deals

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 October 30, 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

Fri 1/9

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Sat 1/10

7:00 pm-2:20 pm

1 stop22h 20m

$251

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 11/25

7:57 am-3:35 pm

Nonstop4h 38m

Toronto Pearson Intl

Mon 12/8

4:45 pm-7:18 pm

Nonstop5h 33m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 11/19

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Fri 11/21

4:45 pm-7:17 pm

Nonstop5h 32m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 11/19

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Thu 11/20

4:45 pm-7:05 pm

Nonstop5h 20m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 3/10

8:00 am-3:35 pm

Nonstop4h 35m

Toronto Pearson Intl

Wed 3/11

4:45 pm-7:05 pm

Nonstop5h 20m

$273

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 11/17

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Wed 11/19

4:45 pm-7:05 pm

Nonstop5h 20m

$273

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 1/12

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Fri 1/16

4:45 pm-7:21 pm

Nonstop5h 36m

$273

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 11/28

7:57 am-3:35 pm

Nonstop4h 38m

Toronto Pearson Intl

Thu 12/4

4:45 pm-7:18 pm

Nonstop5h 33m

$273

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Wed 1/21

10:05 am-11:08 pm

2 stops10h 03m

Ottawa

Fri 1/23

5:45 am-2:31 pm

2 stops11h 46m

$290

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 4/14

3:10 pm-5:16 pm

1 stop23h 06m

Hamilton

Sun 4/19

6:10 pm-2:19 pm

1 stop23h 09m

$295

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

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, March is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of $121). Flying from State of Washington to Region of Ontario in May is currently the most expensive (average of $271). 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 October 30, 2025.

It’s typically best to fly out from State of Washington to Region of Ontario in the afternoon. Doing so could potentially save you 41% on the flight price compared to flying in the morning, which is usually more expensive.

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

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

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

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 October 30, 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
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,214 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
7,993 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
8,998 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
WestJet
7.2
Good
3,149 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Air Canada
7.1
Good
10,376 reviews
Alaska Airlines
8.0
Very good
11,214 reviews

Overall

8.0

Entertainment

7.0

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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 38m. 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 Alaska Airlines, which is currently one of the cheapest options available, starting at $101. Air Canada flights start at $138 while deals on American Airlines start at $138 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, March is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of $121). Flying from State of Washington to Region of Ontario in May is currently the most expensive (average of $271). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$165Average$558FlexibilityNo cancel feeOn-time67%
DeltaCheapest$170Average$402FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$222Average$351FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$273Average$488FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$282Average$669FlexibilityNo cancel feeOn-time69%

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