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Cheap flights from Ontario to Washington, D.C. Dulles Intl Airport from C$ 171

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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — IAD
15 Oct — 22 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Ontario to Dulles Intl

Keep the following information in mind while searching for Ontario to Dulles Intl flight deals. Data was last updated 15 September 2025.

Round-trip from

C$ 256

One-way from

C$ 171

Popular in

June

Cheapest in

April

Average price

C$ 326

Good round-trip deal

C$ 259 or less

Good one-way deal

C$ 154 or less
Porter Airlines
  • Porter Airlines
  • 17/10-20/10
  • Nonstop
  • 3h 04m total
  • Ontario to Washington, D.C.
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Porter Airlines
  • Porter Airlines
  • 3/10
  • Nonstop
  • 1h 31m total
  • Ontario to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 32 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 11 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Ontario to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Ontario to Washington, D.C. Dulles Intl.
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Find flight deals from Ontario to Dulles Intl

Cheapest flights from Ontario to Dulles Intl
Explore the most affordable flight options available from Ontario to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 September 2025.

Fri 17/108:45 a.m.YTZ - IAD
Nonstop1h 31mPorter Airlines
Mon 20/1011:35 a.m.IAD - YTZ
Nonstop1h 33mPorter Airlines
Deal found 14/9C$ 256
Tue 28/108:55 a.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Tue 4/1111:40 a.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Deal found 13/9C$ 261
Thu 16/108:45 a.m.YTZ - IAD
Nonstop1h 31mPorter Airlines
Sun 19/1011:35 a.m.IAD - YTZ
Nonstop1h 33mPorter Airlines
Deal found 14/9C$ 262
Sat 4/101:35 p.m.YTZ - IAD
Nonstop1h 31mPorter Airlines
Sun 5/1011:35 a.m.IAD - YTZ
Nonstop1h 33mPorter Airlines
Deal found 13/9C$ 265
Fri 17/101:35 p.m.YTZ - IAD
Nonstop1h 31mPorter Airlines
Sun 19/104:20 p.m.IAD - YTZ
Nonstop1h 33mPorter Airlines
Deal found 14/9C$ 269
Sun 12/108:45 a.m.YTZ - IAD
Nonstop1h 31mPorter Airlines
Sun 19/1011:35 a.m.IAD - YTZ
Nonstop1h 33mPorter Airlines
Deal found 14/9C$ 274
Thu 23/108:45 a.m.YTZ - IAD
Nonstop1h 31mPorter Airlines
Wed 5/1111:40 a.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Deal found 13/9C$ 275
Sat 25/101:35 p.m.YTZ - IAD
Nonstop1h 31mPorter Airlines
Sun 26/1011:40 a.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Deal found 14/9C$ 276
Sun 23/118:55 a.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Tue 2/1211:40 a.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Deal found 13/9C$ 278
Tue 7/1012:10 p.m.YYZ - IAD
Nonstop1h 28mAir Canada
Wed 8/1010:20 a.m.IAD - YYZ
Nonstop1h 32mAir Canada
Deal found 15/9C$ 280
Tue 28/102:20 p.m.YYZ - IAD
Nonstop1h 34mAir Canada
Tue 4/119:00 a.m.IAD - YYZ
Nonstop1h 29mAir Canada
Deal found 13/9C$ 287
Wed 12/112:20 p.m.YYZ - IAD
Nonstop1h 31mAir Canada
Fri 14/119:00 a.m.IAD - YYZ
Nonstop1h 29mAir Canada
Deal found 14/9C$ 289

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Dulles Intl 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 15 September 2025.
Use the filters below to find and compare flights from Ontario to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Ontario

Fly to

Dulles Intl

Route

Depart

Return

Price

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Thu 23/10

1:35 p.m.-3:06 p.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Tue 28/10

11:40 a.m.-1:10 p.m.

Nonstop1h 30m

C$ 256

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 17/10

8:45 a.m.-10:16 a.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Sun 19/10

4:20 p.m.-5:53 p.m.

Nonstop1h 33m

C$ 256

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Thu 27/11

8:55 a.m.-10:24 a.m.

Nonstop1h 29m

Washington, D.C. Dulles Intl

Wed 3/12

11:40 a.m.-1:10 p.m.

Nonstop1h 30m

C$ 265

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Sat 4/10

1:35 p.m.-3:06 p.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Sun 5/10

11:35 a.m.-1:08 p.m.

Nonstop1h 33m

C$ 265

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Sat 25/10

1:35 p.m.-3:06 p.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Sun 26/10

6:30 p.m.-8:00 p.m.

Nonstop1h 30m

C$ 268

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Mon 6/10

8:45 a.m.-10:16 a.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Wed 8/10

4:20 p.m.-5:53 p.m.

Nonstop1h 33m

C$ 268

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Tue 21/10

1:35 p.m.-3:06 p.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Fri 24/10

4:20 p.m.-5:53 p.m.

Nonstop1h 33m

C$ 268

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 17/10

8:45 a.m.-10:16 a.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Tue 21/10

4:20 p.m.-5:53 p.m.

Nonstop1h 33m

C$ 268

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Thu 9/10

1:35 p.m.-3:06 p.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Sat 11/10

4:20 p.m.-5:53 p.m.

Nonstop1h 33m

C$ 269

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Tue 28/10

3:45 p.m.-5:14 p.m.

Nonstop1h 29m

Washington, D.C. Dulles Intl

Tue 4/11

11:40 a.m.-1:10 p.m.

Nonstop1h 30m

C$ 272

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/9

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl 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, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport?

Currently, February is the cheapest month in which you can book a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport (average of C$ 256). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in October is currently the most expensive (average of C$ 352). 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 IAD?

Find hourly flight availability from Ontario to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 15 September 2025.

When flying from Region of Ontario to Washington, D.C. Dulles Intl Airport, 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 Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Ontario to Dulles Intl. 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 15 September 2025.

The most flights from CAON to IAD are scheduled on a Monday (18 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 on average).

Related info for your journey

Find useful and relevant information for your journey from Ontario to Dulles Intl. 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 Washington, D.C. Dulles Intl Airport?

    Departing from Region of Ontario to Washington, D.C. Dulles Intl Airport will take you 1h 31m. There are 546 km between Region of Ontario and Washington, D.C. Dulles Intl Airport. Most flights are nonstop.

  • What are the cheapest airlines to fly from Region of Ontario to Washington, D.C. Dulles Intl Airport one-way?

    One-way options have recently been found by users for as low as C$ 171 on Porter Airlines. Other airlines that offer cheap prices include Air Canada from C$ 186 and United Airlines from C$ 186 one-way.

  • What are the most popular routes from Region of Ontario to Washington, D.C. Dulles Intl Airport?

    When deciding which route to take from Region of Ontario to Washington, D.C. Dulles Intl Airport consider Montreal Pierre Elliott Trudeau Intl - Washington, D.C. Dulles Intl, Toronto Pearson Intl - Washington, D.C. Dulles Intl or Toronto Island - Washington, D.C. Dulles Intl as they are the most popular.

  • What are the most reliable airlines from Region of Ontario to Washington, D.C. Dulles Intl Airport?

    The top 3 most reliable airlines when flying from Region of Ontario to Washington, D.C. Dulles Intl Airport are Republic Airways (86%), Air Canada (83%) and Copa Airlines (80%).

  • What are the cheapest flights from Region of Ontario to Washington, D.C. Dulles Intl Airport?

    The cheapest flight price from Region of Ontario to Washington, D.C. Dulles Intl Airport is C$ 236. On average you can expect to pay C$ 1,094. The most popular route, (Montreal Pierre Elliott Trudeau Intl - Washington, D.C. Dulles Intl), can usually be booked for C$ 340.

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

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

  • How can I find direct flights from Ontario to Dulles Intl?

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

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

    Yes. Cheapflights offers flight deals from Ontario to Dulles Intl 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 Washington, D.C. Dulles Intl Airport?

    Currently, February is the cheapest month in which you can book a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport (average of C$ 256). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in October is currently the most expensive (average of C$ 352). 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

Travelling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Herndon
Warrenton
Hanover
Reston
Fairfax
Ellicott City
Oxon Hill
Gaithersburg
Winchester
Arlington
Alexandria
Manassas
Fredericksburg
Rockville

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Ontario to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Pearson Intl to Reagan-National flights
Pierre Elliott Trudeau Intl to Dulles Intl flights
Pearson Intl to Dulles Intl flights
Pierre Elliott Trudeau Intl to Reagan-National flights
Toronto Island to Dulles Intl flights
Pearson Intl to Baltimore flights
Vancouver Intl to Dulles Intl flights
Vancouver Intl to Baltimore flights
Pierre Elliott Trudeau Intl to Baltimore flights
Vancouver Intl to Reagan-National flights
Ottawa to Dulles Intl flights
Calgary to Dulles Intl flights
Calgary to Reagan-National flights
Ottawa to Reagan-National flights
Calgary to Baltimore flights
Toronto Island to Baltimore flights
Ottawa to Baltimore flights
Winnipeg to Dulles Intl flights
Winnipeg to Reagan-National flights
Edmonton to Dulles Intl flights
Edmonton to Baltimore flights
Toronto Island to Reagan-National flights
Winnipeg to Baltimore flights
Edmonton to Reagan-National flights
Québec City to Reagan-National flights
Québec City to Dulles Intl flights
Halifax to Reagan-National flights
Halifax to Dulles Intl flights
Halifax to Baltimore flights
Kelowna to Dulles Intl flights
St. John's to Reagan-National flights
St. John's to Dulles Intl flights
London to Reagan-National flights
Victoria to Baltimore flights
Québec City to Baltimore flights
Fort McMurray to Reagan-National flights
Kelowna to Reagan-National flights
Kelowna to Baltimore flights
London to Baltimore flights
Fredericton to Dulles Intl flights
London to Dulles Intl flights
Regina to Baltimore flights
Fort McMurray to Baltimore flights
Regina to Reagan-National flights
Victoria to Reagan-National flights
Saskatoon to Reagan-National flights
Regina to Dulles Intl flights
Victoria to Dulles Intl flights

Top 5 airlines flying from Ontario to Dulles Intl

Discover the top 5 airlines that operate flights from Ontario to Dulles Intl. 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 15 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Air TransatCheapestC$ 204AverageC$ 351FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Porter AirlinesCheapestC$ 213AverageC$ 347FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 263AverageC$ 486FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 269AverageC$ 554FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
WestJetCheapestC$ 431AverageC$ 609FlexibilityNo cancel feeOn-time60%
Search WestJet flights

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How does Cheapflights help users find flights from Ontario to Dulles Intl?

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

Cheapflights helps you find that perfect flight to Dulles Intl from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ontario to Dulles Intl flexibly with Cheapflights today.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Dulles Intl from Ontario today and book when prices fit your budget.

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