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Cheap flights from Washington to Ontario from C$ 128

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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
1 Mar — 8 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Washington to Ontario

Enter your travel dates to find the best prices.

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 30 January 2026.

Sat 21/28:00 a.m.
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Sat 28/28:00 a.m.
YYZ
-
SEA
1 stop9h 31m
Air Canada
Deal found 28/1C$ 307
Sat 21/28:00 a.m.
SEA
-
YYZ
Nonstop4h 43m
Multiple Airlines
Sat 28/24:45 p.m.
YYZ
-
SEA
Nonstop5h 33m
Multiple Airlines
Deal found 28/1C$ 315
Tue 17/37:55 a.m.
SEA
-
YYZ
Nonstop4h 40m
Multiple Airlines
Tue 7/47:45 a.m.
YYZ
-
SEA
1 stop9h 34m
Multiple Airlines
Deal found 28/1C$ 318
Wed 25/28:00 a.m.
SEA
-
YYZ
Nonstop4h 43m
Air Canada
Wed 4/38:00 a.m.
YYZ
-
SEA
2 stops14h 16m
Air Canada
Deal found 28/1C$ 319
Sat 2/57:35 p.m.
SEA
-
YYZ
1 stop7h 10m
WestJet
Sat 9/51:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Deal found 27/1C$ 327
Sat 23/510:30 a.m.
SEA
-
YYZ
2 stops10h 29m
WestJet
Wed 27/51:30 p.m.
YYZ
-
SEA
1 stop8h 15m
WestJet
Deal found 28/1C$ 333
Sat 11/411:55 a.m.
SEA
-
YYZ
2 stops8h 43m
WestJet
Sun 19/47:45 a.m.
YYZ
-
SEA
1 stop9h 34m
WestJet
Deal found 29/1C$ 335
Wed 22/43:10 p.m.
SEA
-
YKF
1 stop11h 19m
WestJet
Mon 27/48:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 29/1C$ 376
Fri 1/57:15 a.m.
SEA
-
YTZ
1 stop9h 37m
Air Canada
Sat 2/512:30 p.m.
YTZ
-
SEA
1 stop10h 07m
Air Canada
Deal found 27/1C$ 381
Wed 29/42:30 p.m.
PDX
-
YYZ
1 stop7h 35m
WestJet
Sun 3/56:10 a.m.
YYZ
-
PDX
2 stops10h 40m
WestJet
Deal found 28/1C$ 387
Thu 7/57:35 p.m.
SEA
-
YUL
1 stop8h 25m
WestJet
Tue 12/58:00 p.m.
YUL
-
SEA
1 stop16h 40m
WestJet
Deal found 27/1C$ 388
Sat 2/57:35 p.m.
SEA
-
YUL
1 stop8h 25m
WestJet
Wed 6/57:15 a.m.
YUL
-
SEA
1 stop14h 30m
WestJet
Deal found 27/1C$ 389

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 30 January 2026.

Round-trip from

C$ 307

One-way from

C$ 128

Popular in

June

Cheapest in

January

Average price

C$ 364

Good round-trip deal

C$ 317 or less

Good one-way deal

C$ 111 or less
Air Canada
  • Air Canada
  • 21/2-28/2
  • 1 total stop
  • 14h 14m total
  • Washington to Ontario
Search Deals
Air Canada
  • Air Canada
  • 11/3
  • 1 total stop
  • 6h 59m total
  • Washington to Ontario
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 130 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 17 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 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 629,999 searches. Data last updated 30 January 2026.
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 - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 2/5

10:30 a.m.-11:59 p.m.

2 stops10h 29m

Toronto Pearson Intl

Sat 9/5

1:30 p.m.-6:45 p.m.

1 stop8h 15m

C$ 330

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 14/3

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Sat 21/3

4:45 p.m.-7:15 p.m.

Nonstop5h 30m

C$ 370

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 1/5

11:14 p.m.-10:04 a.m.

1 stop7h 50m

Toronto Pearson Intl

Sat 2/5

12:57 p.m.-7:00 p.m.

1 stop9h 03m

C$ 370

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 28/2

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Sun 8/3

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 370

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 7/4

10:20 a.m.-1:08 a.m.

1 stop11h 48m

Toronto Pearson Intl

Wed 8/4

7:30 p.m.-9:53 p.m.

Nonstop5h 23m

C$ 375

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 25/5

7:35 p.m.-6:55 a.m.

1 stop8h 20m

Toronto Pearson Intl

Tue 26/5

10:25 p.m.-9:40 a.m.

1 stop14h 15m

C$ 375

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 22/4

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Mon 27/4

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 376

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Fri 1/5

7:15 a.m.-7:52 p.m.

1 stop9h 37m

Toronto Island

Sat 2/5

12:30 p.m.-7:37 p.m.

1 stop10h 07m

C$ 381

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 29/4

8:00 a.m.-3:54 p.m.

Nonstop4h 54m

Toronto Pearson Intl

Sun 3/5

12:00 p.m.-7:37 p.m.

1 stop10h 37m

C$ 383

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 27/2

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Sun 1/3

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 385

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/1

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, April is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of C$ 169). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of C$ 380). 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 30 January 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from State of Washington to Region of Ontario as you normally would.

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 30 January 2026.

The most flights from USWA to CAON are scheduled on a Thursday (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).

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 30 January 2026.
Get a feel of what it's like to fly with Alaska Airlines,WestJet, andAir Canada from Washington to Ontario by reading reviews from past customers. 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
11,813 reviews
Check prices

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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
8.0
Very good
11,813 reviews
Alaska Airlines
8.0
Very good
11,813 reviews
Check prices

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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
3,253 reviews
Alaska Airlines
8.0
Very good
11,813 reviews
Check prices

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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
10,668 reviews
Alaska Airlines
8.0
Very good
11,813 reviews
Check prices

Entertainment

7.0

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Crew

8.5

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?

    There are many flights that can get you from State of Washington to Region of Ontario in 4h 40m. Fly via WestJet, Alaska Airlines, or United Airlines to get the fastest option. Airlines will cover a distance of 3306 km. Both multi-stop and direct flights can be found to your destination and back.

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

    The cheapest airlines for a one-way flight from State of Washington to Region of Ontario are WestJet (C$ 134), Air Canada (C$ 135), and Alaska Airlines (C$ 150).

  • 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, April is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of C$ 169). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of C$ 380). 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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Top 3 airlines flying from Washington to Ontario

Discover the top 3 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 629,999 searches. Data last updated 30 January 2026.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 279AverageC$ 382FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 299AverageC$ 767FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
Air CanadaCheapestC$ 357AverageC$ 516FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Washington to Ontario?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Ontario from Washington today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Washington to Ontario?

Cheapflights simply makes it quick and affordable to book flights from Washington to Ontario by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Washington to Ontario with no change fees?

Certainly. Search results for flights to Ontario from Washington shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Washington to Ontario become cheaper?

Of course! You can now track prices for flights from Washington to Ontario and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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