Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Washington to Ontario from C$ 133

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 15/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
5 Apr — 12 Apr1
1 adult

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 31 March 2025.

Round-trip from

C$ 354

One-way from

C$ 133

Popular in

April

Cheapest in

January

Average price

C$ 528

Good round-trip deal

C$ 438 or less

Good one-way deal

C$ 239 or less
WestJet
  • WestJet
  • 13/5-20/5
  • 2 total stops
  • 17h 39m total
  • Washington to Ontario
15/4
  • 15/4
  • 1 total stop
  • 12h 23m total
  • Washington to Ontario
Highest demand for flights based on searches. 8% potential increase in price (C$ 88 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease (C$ 21 potential savings vs. average RT price).
Average for round-trip flights in March 2025
Price to beat on a round-trip flight from Washington to Ontario.
Price to beat on a one-way flight from Washington to Ontario.

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 31 March 2025.

Tue 13/52:05 p.m.SEA - YKF
1 stop7h 41mWestJet
Tue 20/56:00 a.m.YKF - SEA
1 stop9h 58mWestJet
Deal found 30/3C$ 354
Tue 29/412:30 p.m.SEA - YYZ
1 stop14h 25mMultiple Airlines
Tue 6/57:00 a.m.YYZ - SEA
1 stop20h 56mMultiple Airlines
Deal found 30/3C$ 355
Tue 29/412:30 p.m.SEA - YKF
2 stops33h 16mMultiple Airlines
Tue 6/56:00 a.m.YKF - SEA
1 stop9h 58mMultiple Airlines
Deal found 30/3C$ 362
Sun 15/67:05 a.m.SEA - YYZ
1 stop7h 17mWestJet
Wed 18/68:00 a.m.YYZ - SEA
1 stop7h 58mWestJet
Deal found 31/3C$ 381
Tue 29/42:32 p.m.PDX - YYZ
2 stops13h 20mMultiple Airlines
Tue 6/51:50 p.m.YYZ - PDX
1 stop25h 52mMultiple Airlines
Deal found 30/3C$ 389
Tue 29/42:05 p.m.SEA - YUL
1 stop7h 38mWestJet
Tue 6/57:00 a.m.YUL - SEA
1 stop8h 58mWestJet
Deal found 29/3C$ 411
Thu 8/51:50 p.m.SEA - YHM
1 stop7h 51mWestJet
Sat 10/56:00 a.m.YHM - SEA
1 stop17h 28mWestJet
Deal found 31/3C$ 419
Tue 13/53:20 p.m.SEA - YHM
2 stops30h 21mMultiple Airlines
Tue 20/56:00 a.m.YHM - SEA
1 stop9h 58mMultiple Airlines
Deal found 30/3C$ 424
Wed 14/57:05 a.m.SEA - YXU
1 stop9h 04mWestJet
Wed 21/56:00 a.m.YXU - SEA
1 stop9h 58mWestJet
Deal found 30/3C$ 425
Tue 27/57:05 a.m.SEA - YUL
2 stops14h 32mMultiple Airlines
Thu 29/57:00 a.m.YUL - SEA
1 stop8h 58mMultiple Airlines
Deal found 30/3C$ 435
Wed 20/81:45 p.m.PDX - YYZ
1 stop7h 39mWestJet
Thu 28/88:00 a.m.YYZ - PDX
1 stop7h 52mWestJet
Deal found 31/3C$ 439
Thu 5/61:45 p.m.PDX - YUL
1 stop7h 58mWestJet
Mon 9/67:00 a.m.YUL - PDX
1 stop8h 52mWestJet
Deal found 30/3C$ 448

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 31 March 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

Tue 13/5

2:05 p.m.-12:46 a.m.

1 stop7h 41m

Toronto Region of Waterloo Intl

Tue 20/5

6:00 a.m.-12:58 p.m.

1 stop9h 58m

C$ 354

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 29/4

12:30 p.m.-5:55 a.m.

1 stop14h 25m

Toronto Pearson Intl

Tue 6/5

7:00 a.m.-12:56 a.m.

1 stop20h 56m

C$ 355

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 29/4

12:30 p.m.-12:46 a.m.

2 stops33h 16m

Toronto Region of Waterloo Intl

Tue 6/5

6:00 a.m.-12:58 p.m.

1 stop9h 58m

C$ 362

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 15/6

7:05 a.m.-5:22 p.m.

1 stop7h 17m

Toronto Pearson Intl

Wed 18/6

8:00 a.m.-12:58 p.m.

1 stop7h 58m

C$ 381

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

Tue 29/4

2:32 p.m.-6:52 a.m.

2 stops13h 20m

Toronto Pearson Intl

Tue 6/5

1:50 p.m.-12:42 p.m.

1 stop25h 52m

C$ 389

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Tue 29/4

2:05 p.m.-12:43 a.m.

1 stop7h 38m

Montreal Pierre Elliott Trudeau Intl

Tue 6/5

7:00 a.m.-12:58 p.m.

1 stop8h 58m

C$ 411

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Thu 8/5

1:50 p.m.-12:41 a.m.

1 stop7h 51m

Hamilton

Sat 10/5

6:00 a.m.-8:28 p.m.

1 stop17h 28m

C$ 419

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

Tue 13/5

3:20 p.m.-12:41 a.m.

2 stops30h 21m

Hamilton

Tue 20/5

6:00 a.m.-12:58 p.m.

1 stop9h 58m

C$ 424

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 14/5

7:05 a.m.-7:09 p.m.

1 stop9h 04m

London

Wed 21/5

6:00 a.m.-12:58 p.m.

1 stop9h 58m

C$ 425

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Tue 27/5

7:05 a.m.-12:37 a.m.

2 stops14h 32m

Montreal Pierre Elliott Trudeau Intl

Thu 29/5

7:00 a.m.-12:58 p.m.

1 stop8h 58m

C$ 435

Flights are sorted by cheapest round-trip flights first.

Deals found on 31/3

Showing 1-10 of 60 results
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 C$ 167). Flying from State of Washington to Region of Ontario in July is currently the most expensive (average of C$ 258). 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 31 March 2025.

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 31 March 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 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

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 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

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 31 March 2025.
See what other customers who have flown with Alaska Airlines, Delta and Hawaiian Airlines from Washington to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
8.0
Very good

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.1

Food

7.1

Comfort

7.9

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

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?

    The cheapest airlines for a one-way flight from State of Washington to Region of Ontario are WestJet (C$ 180), Air Canada (C$ 216), and Alaska Airlines (C$ 230).

  • 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 C$ 167). Flying from State of Washington to Region of Ontario in July is currently the most expensive (average of C$ 258). 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.

Top 4 airlines flying from Washington to Ontario

Discover the top 4 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 31 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 233AverageC$ 829FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 307AverageC$ 432FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Alaska AirlinesCheapestC$ 395AverageC$ 697FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapestC$ 524AverageC$ 759FlexibilityNo cancel feeOn-time69%
Search United Airlines 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.

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.