HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$98+ 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 4/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
Apr 16 — Apr 231
Thu 4/16
Thu 4/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington to Ontario 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 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 March 17, 2026.

This Mytrip deal was found by Cheapflights users on 3/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/2510:20 am
SEA
-
YYZ
2 stops10h 26m
Air Canada
Fri 5/112:30 am
YYZ
-
SEA
2 stops12h 20m
Air Canada
Deal found 3/13$219
This Flightnetwork deal was found by Cheapflights users on 3/13. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:20 pm
SEA
-
YYZ
2 stops9h 50m
Air Canada
Fri 5/812:30 am
YYZ
-
SEA
2 stops12h 20m
Air Canada
Deal found 3/13$220
This Mytrip deal was found by Cheapflights users on 3/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/293:40 pm
SEA
-
YYZ
2 stops10h 49m
Air Canada
Tue 5/512:30 am
YYZ
-
SEA
2 stops12h 20m
Air Canada
Deal found 3/15$228
This Trip.com deal was found by Cheapflights users on 3/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/258:00 am
SEA
-
YYZ
Nonstop4h 54m
Multiple Airlines
Sat 5/24:55 pm
YYZ
-
SEA
Nonstop5h 28m
Multiple Airlines
Deal found 3/17$240
This Flightnetwork deal was found by Cheapflights users on 3/13. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/198:00 pm
SEA
-
YTZ
2 stops11h 25m
Air Canada
Tue 4/286:55 pm
YTZ
-
SEA
2 stops23h 10m
Air Canada
Deal found 3/13$282
This Air Canada deal was found by Cheapflights users on 3/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/148:00 pm
SEA
-
YTZ
2 stops11h 25m
Air Canada
Sat 4/183:40 pm
YTZ
-
SEA
2 stops10h 13m
Air Canada
Deal found 3/15$284
This Air Canada deal was found by Cheapflights users on 3/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/95:40 am
SEA
-
YTZ
2 stops9h 42m
Air Canada
Sat 4/183:40 pm
YTZ
-
SEA
2 stops10h 13m
Air Canada
Deal found 3/15$295
This Mytrip deal was found by Cheapflights users on 3/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:20 pm
SEA
-
YTZ
2 stops12h 07m
Air Canada
Sat 5/96:55 pm
YTZ
-
SEA
2 stops17h 55m
Air Canada
Deal found 3/13$296
This Booking.com deal was found by Cheapflights users on 3/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/298:00 pm
SEA
-
YTZ
2 stops11h 25m
Air Canada
Wed 5/68:55 pm
YTZ
-
SEA
2 stops15h 55m
Air Canada
Deal found 3/15$297
This Booking.com deal was found by Cheapflights users on 3/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/278:00 pm
SEA
-
YTZ
2 stops11h 25m
Air Canada
Mon 5/46:55 pm
YTZ
-
SEA
2 stops17h 55m
Air Canada
Deal found 3/13$301
This Air Canada deal was found by Cheapflights users on 3/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/95:40 am
SEA
-
YTZ
2 stops9h 42m
Air Canada
Mon 4/203:40 pm
YTZ
-
SEA
2 stops10h 13m
Air Canada
Deal found 3/15$306
This Mytrip deal was found by Cheapflights users on 3/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/253:15 pm
PDX
-
YYZ
2 stops11h 14m
Air Canada
Fri 5/110:25 pm
YYZ
-
PDX
1 stop14h 05m
Air Canada
Deal found 3/13$310

Find flight deals from Washington to Ontario

Keep the following information in mind while searching for Washington to Ontario flight deals. Data was last updated March 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$219
(Mytrip)

One-way from

$98
(iWofly)

Popular in

June

Cheapest in

January

Average price

$400

Good round-trip deal

$462 or less

Good one-way deal

$225 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. 13% potential increase in price ($61 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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 March 17, 2026.
Use the filters below to find and compare flights from Washington to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 4/22

11:59 pm-9:54 am

1 stop6h 55m

Toronto Pearson Intl

Sat 4/25

3:53 pm-11:12 pm

1 stop10h 19m

$319

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Sat 5/2

2:55 pm-10:27 am

2 stops16h 32m

Toronto Island

Tue 5/5

8:55 pm-9:50 am

2 stops15h 55m

$337

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

Sat 4/25

7:14 pm-7:00 am

1 stop8h 46m

Toronto Pearson Intl

Fri 5/1

5:20 pm-10:38 pm

1 stop8h 18m

$343

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 4/22

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

Wed 4/29

8:40 pm-9:40 am

1 stop16h 00m

$344

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 5/28

6:00 am-5:15 pm

1 stop8h 15m

Toronto Pearson Intl

Sat 6/6

6:30 pm-11:57 pm

1 stop8h 27m

$351

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 5/27

9:30 am-10:59 pm

1 stop10h 29m

Toronto Pearson Intl

Fri 6/5

2:20 pm-10:46 pm

1 stop11h 26m

$351

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 5/6

11:53 pm-9:54 am

1 stop7h 01m

Toronto Pearson Intl

Thu 5/14

2:45 pm-11:59 pm

1 stop12h 14m

$351

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 5/27

11:05 pm-8:59 am

1 stop6h 54m

Toronto Pearson Intl

Mon 6/1

5:45 pm-10:01 pm

1 stop7h 16m

$351

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 5/15

11:00 pm-11:43 am

1 stop9h 43m

Toronto Pearson Intl

Wed 5/20

6:30 am-2:36 pm

1 stop11h 06m

$351

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 5/29

5:30 am-4:33 pm

1 stop8h 03m

Toronto Pearson Intl

Tue 6/2

6:12 pm-10:46 pm

1 stop7h 34m

$351

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/13

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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 $132). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of $281). 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 March 17, 2026.

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 March 17, 2026.

The most flights from USWA to CAON are scheduled on a Monday (5 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (3 on average).

How much does it cost to fly round-trip from State of Washington to Region of Ontario?

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 March 17, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andUnited 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
7.9
Good
12,058 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.0

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
7.9
Good
12,058 reviews
Alaska Airlines
7.9
Good
12,058 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.0

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,288 reviews
Alaska Airlines
7.9
Good
12,058 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.0

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
United Airlines
7.4
Good
9,431 reviews
Alaska Airlines
7.9
Good
12,058 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.0

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
WestJet
7.2
Good
3,296 reviews
Alaska Airlines
7.9
Good
12,058 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.0

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Air Canada
7.1
Good
10,811 reviews
Alaska Airlines
7.9
Good
12,058 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Food

7.0

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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 $76. Alaska Airlines flights start at $82 while deals on Air Canada start at $99 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 $132). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of $281). 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 Washington to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Vancouver Intl flights
John F Kennedy Intl to Pierre Elliott Trudeau Intl flights
San Francisco to Vancouver Intl flights
John F Kennedy Intl to Pearson Intl flights
Newark to Pearson Intl flights
John F Kennedy Intl to Vancouver Intl flights
Newark to Toronto Island flights
Newark to Vancouver Intl flights
LaGuardia to Pierre Elliott Trudeau Intl flights
LaGuardia to Pearson Intl flights
O'Hare Intl to Vancouver Intl flights
John F Kennedy Intl to Calgary flights
Newark to Calgary flights
Reagan-National to Pearson Intl flights
Los Angeles to Pearson Intl flights
Hobby to Vancouver Intl flights
Dulles Intl to Vancouver Intl flights
O'Hare Intl to Pearson Intl flights
Atlanta to Vancouver Intl flights
Dulles Intl to Pearson Intl flights
Denver to Vancouver Intl flights
George Bush Intcntl to Vancouver Intl flights
O'Hare Intl to Calgary flights
Minneapolis to Vancouver Intl flights
Los Angeles to Calgary flights
Reagan-National to Pierre Elliott Trudeau Intl flights
San Francisco to Calgary flights
San Francisco to Pearson Intl flights
Boston to Vancouver Intl flights
Dallas/Fort Worth to Vancouver Intl flights
O'Hare Intl to Pierre Elliott Trudeau Intl flights
Dallas/Fort Worth to Pearson Intl flights
Los Angeles to Pierre Elliott Trudeau Intl flights
Boston to Pearson Intl flights
Minneapolis to Calgary flights
San Francisco to Abbotsford flights
San Diego to Vancouver Intl flights
Hobby to Calgary flights
Seattle to Pearson Intl flights
Los Angeles to Abbotsford flights
Baltimore to Vancouver Intl flights
Sacramento to Vancouver Intl flights
Dulles Intl to Calgary flights
Dallas/Fort Worth to Calgary flights
Sky Harbor Intl to Vancouver Intl flights
Santa Ana to Vancouver Intl flights
Detroit to Vancouver Intl flights

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 March 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$138Average$387FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$165Average$538FlexibilityNo cancel feeOn-time67%
WestJetCheapest$222Average$347FlexibilityNo cancel feeOn-time60%
United AirlinesCheapest$238Average$497FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$252Average$423FlexibilityNo cancel feeOn-time75%

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.