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Cheap flights from Ontario to Washington, D.C. Dulles Intl Airport from C$ 186

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 29/7. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — IAD
23 Jul — 30 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ontario to Dulles Intl

Enter your travel dates to find the best prices.

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 23 June 2026.

Thu 23/78:55 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Sun 26/73:55 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 21/6C$ 290
Fri 17/71:40 p.m.
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Tue 21/711:05 a.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 18/6C$ 292
Sat 11/71:40 p.m.
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Tue 14/711:05 a.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 21/6C$ 293
Sat 11/71:40 p.m.
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Sun 12/73:55 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 20/6C$ 295
Fri 10/78:55 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Sun 12/73:55 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 20/6C$ 296
Thu 6/81:40 p.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Thu 13/83:50 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 22/6C$ 298
Wed 8/78:55 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Wed 8/73:55 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 19/6C$ 299
Fri 3/78:55 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Sun 5/711:05 a.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 18/6C$ 303
Thu 9/71:40 p.m.
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Sun 12/73:55 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 18/6C$ 305
Thu 16/78:55 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Sun 19/73:55 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 21/6C$ 306
Tue 6/105:27 p.m.
YYZ
-
IAD
1 stop5h 25m
United Airlines
Wed 7/108:28 a.m.
IAD
-
YYZ
Nonstop1h 36m
United Airlines
Deal found 18/6C$ 306
Fri 24/71:40 p.m.
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Sat 25/73:55 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 22/6C$ 307

Find 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 23 June 2026.

Round-trip from

C$ 290

One-way from

C$ 186

Popular in

March

Cheapest in

October

Average price

C$ 401

Good round-trip deal

C$ 308 or less

Good one-way deal

C$ 227 or less
Porter Airlines
  • Porter Airlines
  • 23/7-26/7
  • Nonstop
  • 3h 00m total
  • Ontario to Washington, D.C.
Search Deals
Porter Airlines
  • Porter Airlines
  • 29/7
  • Nonstop
  • 1h 31m total
  • Ontario to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 64 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Ontario to Washington, D.C. Dulles Intl.
Search Deals

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 23 June 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 17/7

8:55 a.m.-10:25 a.m.

Nonstop1h 30m

Washington, D.C. Dulles Intl

Mon 20/7

3:55 p.m.-5:25 p.m.

Nonstop1h 30m

C$ 315

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Thu 16/7

8:55 a.m.-10:25 a.m.

Nonstop1h 30m

Washington, D.C. Dulles Intl

Tue 28/7

3:55 p.m.-5:25 p.m.

Nonstop1h 30m

C$ 332

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Sun 12/7

8:55 a.m.-10:25 a.m.

Nonstop1h 30m

Washington, D.C. Dulles Intl

Sun 2/8

3:50 p.m.-5:20 p.m.

Nonstop1h 30m

C$ 334

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Thu 16/7

1:40 p.m.-3:11 p.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Tue 4/8

3:50 p.m.-5:20 p.m.

Nonstop1h 30m

C$ 334

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 3/7

1:40 p.m.-3:11 p.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Mon 6/7

11:05 a.m.-12:35 p.m.

Nonstop1h 30m

C$ 344

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 24/7

8:55 a.m.-10:25 a.m.

Nonstop1h 30m

Washington, D.C. Dulles Intl

Sun 26/7

11:05 a.m.-12:35 p.m.

Nonstop1h 30m

C$ 367

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 17/7

1:40 p.m.-3:11 p.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Sun 19/7

3:55 p.m.-5:25 p.m.

Nonstop1h 30m

C$ 367

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Wed 22/7

8:55 a.m.-10:25 a.m.

Nonstop1h 30m

Washington, D.C. Dulles Intl

Sun 26/7

11:05 a.m.-12:35 p.m.

Nonstop1h 30m

C$ 367

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Thu 13/8

1:40 p.m.-3:10 p.m.

Nonstop1h 30m

Washington, D.C. Dulles Intl

Sat 15/8

11:25 a.m.-12:55 p.m.

Nonstop1h 30m

C$ 398

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Sat 18/7

1:40 p.m.-3:11 p.m.

Nonstop1h 31m

Washington, D.C. Dulles Intl

Fri 24/7

3:55 p.m.-5:25 p.m.

Nonstop1h 30m

C$ 398

Flights are sorted by cheapest round-trip flights first.

Deals found on 18/6

Showing 1-10 of 60 resultsSorted by cheapest first
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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, July 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$ 123). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in January is currently the most expensive (average of C$ 238). 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 23 June 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 26% on flights from Region of Ontario to Washington, D.C. Dulles Intl Airport by exploring options for tickets in the afternoon.

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 23 June 2026.

The most flights from CAON to IAD are scheduled on a Monday (19 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (13 on average).

How much does it cost to fly round-trip from Region of Ontario to Washington, D.C. Dulles Intl Airport?

How far ahead should I book a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport?

The price you pay for your flight from Region of Ontario to Washington, D.C. Dulles Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 34 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest day to fly from Region of Ontario to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Dulles Intl. Price data was last updated on 20 June 2026.

Travelers seeking maximum savings on their Region of Ontario to Washington, D.C. Dulles Intl Airport flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 30m. There are 546 km between Region of Ontario and Washington, D.C. Dulles Intl Airport. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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$ 142 on Porter Airlines. Other airlines that offer cheap prices include Air Transat from C$ 151 and United Airlines from C$ 196 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 Toronto Pearson Intl - Washington, D.C. Dulles Intl, Toronto Island - Washington, D.C. Dulles Intl or Montreal Pierre Elliott Trudeau Intl - 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 Avianca (92%), Copa Airlines (91%) and Republic Airways (91%).

  • 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$ 230. On average you can expect to pay C$ 490. The most popular route, (Toronto Pearson Intl - Washington, D.C. Dulles Intl), can usually be booked for C$ 402.

  • 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, July 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$ 123). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in January is currently the most expensive (average of C$ 238). 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
Silver Spring
Warrenton
Winchester
Hanover
Fairfax
Oxon Hill
Gaithersburg
Chantilly
Reston
Herndon
Ellicott City
Arlington
Fredericksburg
Alexandria
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
Pearson Intl to Dulles Intl flights
Toronto Island to Dulles Intl flights
Pearson Intl to Baltimore flights
Vancouver Intl to Dulles Intl flights
Vancouver Intl to Reagan-National flights
Vancouver Intl to Baltimore flights
Toronto Island to Reagan-National flights
Pierre Elliott Trudeau Intl to Dulles Intl flights
Pierre Elliott Trudeau Intl to Reagan-National flights
Calgary to Dulles Intl flights
Pierre Elliott Trudeau Intl to Baltimore flights
Winnipeg to Dulles Intl flights
Calgary to Baltimore flights
Winnipeg to Baltimore flights
Winnipeg to Reagan-National flights
Ottawa to Dulles Intl flights
Calgary to Reagan-National flights
Toronto Island to Baltimore flights
Ottawa to Reagan-National flights
Halifax to Dulles Intl flights
Edmonton to Dulles Intl flights
Québec City to Dulles Intl flights
Québec City to Reagan-National flights
Ottawa to Baltimore flights
Québec City to Baltimore flights
Halifax to Baltimore flights
Edmonton to Reagan-National flights
Halifax to Reagan-National flights
Victoria to Dulles Intl flights
Victoria to Baltimore flights
Edmonton to Baltimore flights
Hamilton to Reagan-National flights
Saskatoon to Reagan-National flights
St. John's to Baltimore flights
Regina to Reagan-National flights
Victoria to Reagan-National flights
Kelowna to Dulles Intl flights
Regina to Baltimore flights
Saskatoon to Baltimore flights
London to Reagan-National flights
Kelowna to Reagan-National flights
Fredericton to Dulles Intl flights
Kamloops to Dulles Intl flights
Kelowna to Baltimore flights
London to Baltimore flights
Fort McMurray to Baltimore flights
Fort McMurray to Reagan-National flights

Top 4 airlines flying from Ontario to Dulles Intl

Discover the top 4 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 23 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 129AverageC$ 496FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Porter AirlinesCheapestC$ 229AverageC$ 342FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air TransatCheapestC$ 305AverageC$ 531FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
United AirlinesCheapestC$ 345AverageC$ 510FlexibilityNo 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 Ontario to Dulles Intl?

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 Dulles Intl from Ontario today with Cheapflights!

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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