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Cheap flights from Ontario to Washington, D.C. Dulles Intl Airport from C$ 183

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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — IAD
8 Sep — 15 Sep1
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 9 August 2026.

Fri 4/910:30 a.m. -
1 stop4h 25m
Tue 8/99:45 a.m. -
1 stop4h 48m
Deal found 7/8C$ 276
Sat 22/89:15 a.m. -
Nonstop1h 30m
Tue 25/811:25 a.m. -
Nonstop1h 30m
Deal found 8/8C$ 277
Thu 27/81:55 p.m. -
Nonstop1h 29m
Sun 30/89:45 a.m. -
1 stop6h 40m
Deal found 9/8C$ 277
Thu 20/810:45 a.m. -
1 stop4h 16m
Mon 24/85:20 p.m. -
Nonstop1h 36m
Deal found 6/8C$ 279
Thu 20/81:55 p.m. -
Nonstop1h 29m
Mon 24/84:20 p.m. -
Nonstop1h 30m
Deal found 6/8C$ 279
Thu 20/810:45 a.m. -
1 stop4h 16m
Sun 23/811:25 a.m. -
Nonstop1h 30m
Deal found 6/8C$ 280
Sat 19/93:15 p.m. -
Nonstop1h 23m
Sat 26/99:45 a.m. -
1 stop4h 35m
Deal found 4/8C$ 282
Sat 5/92:00 p.m. -
1 stop5h 01m
Sat 12/94:00 p.m. -
Nonstop1h 25m
Deal found 8/8C$ 282
Fri 28/83:15 p.m. -
Nonstop1h 26m
Mon 31/89:45 a.m. -
1 stop6h 06m
Deal found 5/8C$ 283
Sat 10/106:55 p.m. -
Nonstop1h 30m
Sat 17/109:55 a.m. -
Nonstop1h 25m
Deal found 5/8C$ 283
Thu 20/89:30 a.m. -
1 stop5h 31m
Thu 27/85:20 p.m. -
Nonstop1h 36m
Deal found 5/8C$ 284
Thu 20/81:55 p.m. -
Nonstop1h 29m
Wed 26/84:20 p.m. -
Nonstop1h 30m
Deal found 5/8C$ 284

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 9 August 2026.

Round-trip from

C$ 276

One-way from

C$ 183

Popular in

March

Cheapest in

October

Average price

C$ 372

Good round-trip deal

C$ 339 or less

Good one-way deal

C$ 215 or less
Air Canada
  • Air Canada
  • 4/9-8/9
  • 2 total stops
  • 9h 13m total
  • Ontario to Washington, D.C.
Search Deals
Air Canada
  • Air Canada
  • 3/9
  • Nonstop
  • 1h 29m total
  • Ontario to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 65 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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.
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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 9 August 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 Toronto Island - IAD Washington, D.C. Dulles Intl

YTZIAD

Toronto Island

Fri 28/8

9:15 a.m.-10:45 a.m.

Nonstop1h 30m

Washington, D.C. Dulles Intl

Tue 1/9

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

Nonstop1h 30m

C$ 311

TorontoWashington, D.C.

YYZ Toronto Pearson Intl - IAD Washington, D.C. Dulles Intl

YYZIAD

Toronto Pearson Intl

Fri 21/8

7:00 a.m.-11:52 a.m.

1 stop4h 52m

Washington, D.C. Dulles Intl

Sun 23/8

8:28 a.m.-10:04 a.m.

Nonstop1h 36m

C$ 330

TorontoWashington, D.C.

YYZ Toronto Pearson Intl - IAD Washington, D.C. Dulles Intl

YYZIAD

Toronto Pearson Intl

Sat 5/9

12:09 p.m.-4:38 p.m.

1 stop4h 29m

Washington, D.C. Dulles Intl

Sat 12/9

12:25 p.m.-5:35 p.m.

1 stop5h 10m

C$ 332

TorontoWashington, D.C.

YYZ Toronto Pearson Intl - IAD Washington, D.C. Dulles Intl

YYZIAD

Toronto Pearson Intl

Thu 27/8

4:10 p.m.-11:26 p.m.

1 stop7h 16m

Washington, D.C. Dulles Intl

Sat 29/8

6:10 a.m.-11:19 a.m.

1 stop5h 09m

C$ 332

TorontoWashington, D.C.

YYZ Toronto Pearson Intl - IAD Washington, D.C. Dulles Intl

YYZIAD

Toronto Pearson Intl

Fri 25/9

6:10 p.m.-11:14 p.m.

1 stop5h 04m

Washington, D.C. Dulles Intl

Sun 11/10

6:05 a.m.-1:36 p.m.

1 stop7h 31m

C$ 333

TorontoWashington, D.C.

YYZ Toronto Pearson Intl - IAD Washington, D.C. Dulles Intl

YYZIAD

Toronto Pearson Intl

Fri 25/9

2:24 p.m.-11:14 p.m.

1 stop8h 50m

Washington, D.C. Dulles Intl

Sun 27/9

6:10 a.m.-1:34 p.m.

1 stop7h 24m

C$ 333

TorontoWashington, D.C.

YYZ Toronto Pearson Intl - IAD Washington, D.C. Dulles Intl

YYZIAD

Toronto Pearson Intl

Tue 6/10

7:43 p.m.-9:24 p.m.

Nonstop1h 41m

Washington, D.C. Dulles Intl

Wed 7/10

9:55 a.m.-11:20 a.m.

Nonstop1h 25m

C$ 341

TorontoWashington, D.C.

YTZ Toronto Island - IAD Washington, D.C. Dulles Intl

YTZIAD

Toronto Island

Wed 9/9

10:45 a.m.-3:00 p.m.

1 stop4h 15m

Washington, D.C. Dulles Intl

Thu 10/9

8:15 a.m.-1:15 p.m.

1 stop5h 00m

C$ 355

TorontoWashington, D.C.

YTZ Toronto Island - IAD Washington, D.C. Dulles Intl

YTZIAD

Toronto Island

Sat 29/8

9:15 a.m.-10:45 a.m.

Nonstop1h 30m

Washington, D.C. Dulles Intl

Thu 3/9

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

Nonstop1h 30m

C$ 362

TorontoWashington, D.C.

YTZ Toronto Island - IAD Washington, D.C. Dulles Intl

YTZIAD

Toronto Island

Tue 25/8

7:35 p.m.-9:28 a.m.

1 stop13h 53m

Washington, D.C. Dulles Intl

Sat 5/9

10:27 p.m.-10:07 a.m.

1 stop11h 40m

C$ 371

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/8

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, April 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$ 378). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of C$ 464). 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 9 August 2026.

Unlike at noon, when flights are generally more expensive, you can save up to 34% 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 9 August 2026.

The most flights from CAON to IAD are scheduled on a Monday (18 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 Region of Ontario to Washington, D.C. Dulles Intl Airport?

Airfare is below average for this route at the moment.
Region of Ontario to Washington, D.C. Dulles Intl Airport flights typically cost between C$ 375 and C$ 601 in September.
The cheapest round-trip price found within the last 5 days was C$ 276 on Air Canada (4 Sep-8 Sep).

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 1 August 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. Monday 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$ 155 on Porter Airlines. Other airlines that offer cheap prices include Air Canada from C$ 196 and United Airlines from C$ 201 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 Republic Airways (81%), Copa Airlines (80%) and United Airlines (79%).

  • 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$ 194. On average you can expect to pay C$ 2,069. The most popular route, (Toronto Pearson Intl - Washington, D.C. Dulles Intl), can usually be booked for C$ 288.

  • 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, April 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$ 378). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of C$ 464). 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
Alexandria
Hanover
Oxon Hill
Gaithersburg
Reston
Chantilly
Herndon
Ellicott City
Arlington
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
Pearson Intl to Dulles Intl flights
Toronto Island to Dulles Intl flights
Pearson Intl to Baltimore flights
Toronto Island to Reagan-National flights
Pierre Elliott Trudeau Intl to Reagan-National flights
Vancouver Intl to Dulles Intl flights
Pierre Elliott Trudeau Intl to Dulles Intl flights
Ottawa to Dulles Intl flights
Vancouver Intl to Reagan-National flights
Calgary to Dulles Intl flights
Ottawa to Reagan-National flights
Toronto Island to Baltimore flights
Vancouver Intl to Baltimore flights
Pierre Elliott Trudeau Intl to Baltimore flights
Ottawa to Baltimore flights
Calgary to Reagan-National flights
Calgary to Baltimore flights
Winnipeg to Reagan-National flights
Winnipeg to Dulles Intl flights
Winnipeg to Baltimore flights
Edmonton to Dulles Intl flights
Edmonton to Reagan-National flights
Edmonton to Baltimore flights
Québec City to Dulles Intl flights
Halifax to Dulles Intl flights
Halifax to Reagan-National flights
Regina to Reagan-National flights
Hamilton to Reagan-National flights
Québec City to Baltimore flights
Halifax to Baltimore flights
London to Dulles Intl flights
Québec City to Reagan-National flights
Victoria to Dulles Intl flights
Saskatoon to Baltimore flights
London to Reagan-National flights
Kelowna to Dulles Intl flights
Kamloops to Dulles Intl flights
St. John's to Dulles Intl flights
Regina to Baltimore flights
St. John's to Reagan-National flights
Fredericton to Dulles Intl flights
Saskatoon to Reagan-National flights
Kamloops to Baltimore flights
Kelowna to Baltimore flights
Fort McMurray to Reagan-National flights
Victoria to Reagan-National flights
Regina to Dulles Intl 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 9 August 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 113AverageC$ 503FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Porter AirlinesCheapestC$ 233AverageC$ 342FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air TransatCheapestC$ 300AverageC$ 602FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
United AirlinesCheapestC$ 339AverageC$ 506FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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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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