HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Washington

$132+ Cheap flights from Ontario to Washington

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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SEA
Feb 27 — Mar 61
Fri 2/27
Fri 3/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Washington with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Ontario to Washington

Cheapest flights from Ontario to Washington
Explore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 28, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/26. 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 3/74:45 pm
YYZ
-
SEA
Nonstop5h 33m
Alaska Airlines
Sat 3/147:55 am
SEA
-
YYZ
Nonstop4h 40m
Alaska Airlines
Deal found 1/26$209
This Air Canada deal was found by Cheapflights users on 1/26. 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 2/177:50 pm
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Wed 2/188:00 am
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Deal found 1/26$219
This Air Canada deal was found by Cheapflights users on 1/26. 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 2/177:50 pm
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Tue 2/248:00 pm
SEA
-
YYZ
1 stop7h 29m
Air Canada
Deal found 1/26$225
This Air Canada deal was found by Cheapflights users on 1/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/187:50 pm
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Tue 2/248:00 pm
SEA
-
YYZ
1 stop7h 29m
Air Canada
Deal found 1/27$227
This Air Canada deal was found by Cheapflights users on 1/25. 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.
Sun 2/157:50 pm
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Fri 2/208:00 am
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Deal found 1/25$228
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/74:55 pm
YYZ
-
SEA
Nonstop5h 28m
Alaska Airlines
Wed 5/137:59 am
SEA
-
YYZ
Nonstop4h 46m
Alaska Airlines
Deal found 1/27$229
This Air Canada deal was found by Cheapflights users on 1/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/177:50 pm
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Thu 2/198:00 am
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Deal found 1/27$230
This Air Canada deal was found by Cheapflights users on 1/26. 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.
Mon 2/167:50 pm
YYZ
-
SEA
Nonstop5h 26m
Air Canada
Tue 2/248:00 pm
SEA
-
YYZ
1 stop7h 29m
Air Canada
Deal found 1/26$232
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Fri 5/81:30 pm
YYZ
-
SEA
1 stop8h 15m
WestJet
Mon 5/117:35 pm
SEA
-
YYZ
1 stop7h 10m
WestJet
Deal found 1/27$233
This oojo deal was found by Cheapflights users on 1/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:30 pm
YUL
-
SEA
1 stop21h 49m
WestJet
Fri 6/57:35 pm
SEA
-
YUL
1 stop8h 25m
WestJet
Deal found 1/27$258
This Trip.com deal was found by Cheapflights users on 1/28. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/78:00 pm
YUL
-
SEA
1 stop16h 40m
WestJet
Sun 5/107:35 pm
SEA
-
YUL
1 stop8h 25m
WestJet
Deal found 1/28$260
This oojo deal was found by Cheapflights users on 1/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/136:45 am
YUL
-
SEA
2 stops15h 00m
WestJet
Sat 5/237:35 pm
SEA
-
YUL
1 stop8h 25m
WestJet
Deal found 1/27$265

Find flight deals from Ontario to Washington

Keep the following information in mind while searching for Ontario to Washington flight deals. Data was last updated January 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$209
(Kiwi.com)

One-way from

$132
(CheapOair)

Popular in

June

Cheapest in

February

Average price

$398

Good round-trip deal

$209 or less

Good one-way deal

$134 or less
Provider with most accurate pricing for Toronto (YTO)-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-Seattle/Tacoma Intl flights.
Search Deals
From Ontario to Washington
Search Deals
One-way flight from Ontario to Washington
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Washington.
Search Deals
Price to beat on a one-way flight from Ontario to Washington.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Washington 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 January 28, 2026.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.

Fly from

Ontario

Fly to

Washington

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 2/19

4:45 pm-7:18 pm

Nonstop5h 33m

Seattle/Tacoma Intl

Mon 2/23

7:55 am-3:35 pm

Nonstop4h 40m

$238

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 2/18

5:30 pm-10:43 pm

1 stop8h 13m

Seattle/Tacoma Intl

Tue 2/24

7:00 am-7:45 pm

1 stop9h 45m

$246

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 2/25

5:30 pm-10:43 pm

1 stop8h 13m

Seattle/Tacoma Intl

Wed 3/4

7:00 am-7:45 pm

1 stop9h 45m

$246

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 2/27

2:57 pm-11:51 pm

1 stop11h 54m

Seattle/Tacoma Intl

Mon 3/9

7:35 pm-7:30 am

1 stop8h 55m

$248

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/10

4:45 pm-7:18 pm

Nonstop5h 33m

Seattle/Tacoma Intl

Thu 3/12

7:55 am-3:35 pm

Nonstop4h 40m

$249

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 2/19

4:10 pm-10:59 pm

1 stop9h 49m

Seattle/Tacoma Intl

Tue 2/24

9:00 am-11:46 pm

2 stops11h 46m

$254

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 2/19

4:10 pm-10:59 pm

1 stop9h 49m

Seattle/Tacoma Intl

Sat 2/28

11:59 pm-9:58 am

1 stop6h 59m

$255

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/3

5:30 pm-10:43 pm

1 stop8h 13m

Seattle/Tacoma Intl

Fri 3/6

7:10 pm-3:02 pm

1 stop16h 52m

$255

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 2/17

8:45 am-7:03 pm

1 stop13h 18m

Seattle/Tacoma Intl

Mon 2/23

9:19 am-11:59 pm

2 stops11h 40m

$262

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 3/4

5:40 am-2:19 pm

2 stops11h 39m

Seattle/Tacoma Intl

Sun 3/8

3:10 pm-6:23 pm

2 stops24h 13m

$267

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Ontario to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Ontario 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 Ontario to Washington

What is the cheapest month to book a flight from Region of Ontario to State of Washington?

Currently, December is the cheapest month in which you can book a flight from Region of Ontario to State of Washington (average of $131). Flying from Region of Ontario to State of Washington in August is currently the most expensive (average of $223). 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 ON to WA?

Find hourly flight availability from Ontario to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 28, 2026.

When flying from Region of Ontario to State of Washington, 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 Region of Ontario to State of Washington

Explore weekly flight availability from Ontario to Washington. 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 January 28, 2026.

The most flights from CAON to USWA are scheduled on a Monday (9 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (5 on average).

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated January 28, 2026.
Read through reviews of airlines operating flights from Ontario to Washington, such as Alaska Airlines, Delta, and United Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,801 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,801 reviews
Alaska Airlines
8.0
Very good
11,801 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,123 reviews
Alaska Airlines
8.0
Very good
11,801 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
United Airlines
7.4
Good
9,209 reviews
Alaska Airlines
8.0
Very good
11,801 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
WestJet
7.2
Good
3,251 reviews
Alaska Airlines
8.0
Very good
11,801 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Air Canada
7.1
Good
10,666 reviews
Alaska Airlines
8.0
Very good
11,801 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Washington. 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 Region of Ontario to State of Washington?

    Departing from Region of Ontario to State of Washington will take you 5h 33m. The distance from Region of Ontario to State of Washington is about 2054 mi. This flight may include one or multiple stops.

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

    The cheapest airlines for a one-way flight from Region of Ontario to State of Washington are WestJet ($116), Alaska Airlines ($129), and United Airlines ($136).

  • Can I find deals for flights from Ontario to Washington that include hotel bookings?

    Yes. In addition to deals on Ontario to Washington flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Washington.

  • Can I find deals for business class flights from Ontario to Washington?

    Yes. Cheapflights offers flight deals from Ontario to Washington 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 Region of Ontario to State of Washington?

    Currently, December is the cheapest month in which you can book a flight from Region of Ontario to State of Washington (average of $131). Flying from Region of Ontario to State of Washington in August is currently the most expensive (average of $223). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Washington

See prices for flight routes from nearby airports that may be better suited for you.
Pierre Elliott Trudeau Intl to Fort Lauderdale flights
Pearson Intl to John F Kennedy Intl flights
Pearson Intl to Miami flights
Pierre Elliott Trudeau Intl to Miami flights
Toronto Island to Newark flights
Pearson Intl to Orlando flights
Pearson Intl to Fort Lauderdale flights
Pearson Intl to Newark flights
Pearson Intl to LaGuardia flights
Pearson Intl to Las Vegas flights
Vancouver Intl to Los Angeles flights
Pierre Elliott Trudeau Intl to John F Kennedy Intl flights
Pierre Elliott Trudeau Intl to LaGuardia flights
Vancouver Intl to Las Vegas flights
Pierre Elliott Trudeau Intl to Newark flights
Pearson Intl to Los Angeles flights
Pearson Intl to Tampa flights
Toronto Island to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to Orlando flights
Pearson Intl to Dallas/Fort Worth flights
Pearson Intl to San Francisco flights
Pearson Intl to Seattle flights
Vancouver Intl to Honolulu flights
Toronto Island to Orlando flights
Vancouver Intl to Newark flights
Vancouver Intl to John F Kennedy Intl flights
Pearson Intl to Sky Harbor Intl flights
Pierre Elliott Trudeau Intl to Los Angeles flights
Vancouver Intl to San Francisco flights
Pearson Intl to Reagan-National flights
Pearson Intl to Hobby flights
Pierre Elliott Trudeau Intl to Las Vegas flights
Toronto Island to Miami flights
Pearson Intl to Boston flights
Calgary to Las Vegas flights
Pearson Intl to George Bush Intcntl flights
Hamilton to Fort Lauderdale flights
Pierre Elliott Trudeau Intl to O'Hare Intl flights
Edmonton to Las Vegas flights
Vancouver Intl to Sky Harbor Intl flights
Pearson Intl to Fort Myers flights
Pearson Intl to O'Hare Intl flights
Vancouver Intl to Ontario flights
Québec City to Fort Lauderdale flights
Abbotsford to Los Angeles flights
Vancouver Intl to San Diego flights
Calgary to Sky Harbor Intl flights
Vancouver Intl to Palm Springs flights
Pearson Intl to Atlanta flights
Vancouver Intl to Santa Ana flights

Top 6 airlines flying from Ontario to Washington

Discover the top 6 airlines that operate flights from Ontario to Washington. 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 January 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$185Average$455FlexibilityNo cancel feeOn-time67%
WestJetCheapest$192Average$379FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$200Average$375FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$240Average$443FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$277Average$277FlexibilityNo cancel feeOn-time71%
DeltaCheapest$289Average$356FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
Cookie settings©2026 Cheapflights