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Dulles Intl

$131+ Cheap flights from Ontario to Dulles Intl (IAD)

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 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — IAD
Sep 4 — Sep 111
Fri 9/4
Fri 9/11
1 adult, Economy
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Cheap 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 August 5, 2026.

This Air Canada deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1910:45 am -
1 stop4h 15m
Tue 9/229:45 am -
1 stop4h 35m
Deal found 7/31$202
This Air Canada deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1610:30 am -
1 stop4h 30m
Wed 9/239:55 am -
Nonstop1h 25m
Deal found 8/1$202
This Air Canada deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/283:15 pm -
Nonstop1h 26m
Mon 8/319:45 am -
1 stop6h 06m
Deal found 8/5$203
This Air Canada deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:55 pm -
Nonstop1h 29m
Wed 8/269:45 am -
1 stop5h 50m
Deal found 8/1$203
This Trip.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2010:45 am -
1 stop4h 16m
Sun 8/2311:25 am -
Nonstop1h 30m
Deal found 8/5$204
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:44 am -
Nonstop1h 37m
Sun 9/1310:19 pm -
Nonstop1h 35m
Deal found 8/4$204
This Kiwi.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/221:40 pm -
Nonstop1h 30m
Sun 8/303:50 pm -
Nonstop1h 30m
Deal found 8/4$205
This Kissandfly.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/19:44 am -
Nonstop1h 37m
Tue 9/810:19 pm -
Nonstop1h 35m
Deal found 8/2$205
This Booking.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:30 am -
1 stop6h 31m
Sat 8/2911:25 am -
Nonstop1h 30m
Deal found 8/4$206
This Kiwi.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/221:40 pm -
Nonstop1h 30m
Thu 8/273:50 pm -
Nonstop1h 30m
Deal found 8/4$207
This Booking.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/211:55 pm -
Nonstop1h 29m
Tue 8/254:20 pm -
Nonstop1h 30m
Deal found 8/5$207
This Booking.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:30 am -
1 stop5h 31m
Sat 8/223:50 pm -
Nonstop1h 30m
Deal found 8/4$208

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 August 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$202
(Air Canada)

One-way from

$131
(Trip.com)

Popular in

March

Cheapest in

October

Average price

$248

Good round-trip deal

$193 or less

Good one-way deal

$142 or less
Provider with most accurate pricing for Toronto (YTO)-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-Washington, D.C. (WAS) flights.
Search Deals
From Ontario to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Ontario to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($35 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 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.
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 2,558,603 searches. Data last updated August 5, 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

Thu 8/27

9:15 am-10:45 am

Nonstop1h 30m

Washington, D.C. Dulles Intl

Sat 8/29

3:50 pm-5:20 pm

Nonstop1h 30m

$215
Quickest round-trip

TorontoWashington, D.C.

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

YTZIAD

Toronto Island

Wed 10/14

3:15 pm-4:38 pm

Nonstop1h 23m

Washington, D.C. Dulles Intl

Mon 10/19

5:15 pm-6:46 pm

Nonstop1h 31m

$215

TorontoWashington, D.C.

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

YYZIAD

Toronto Pearson Intl

Thu 8/20

4:10 pm-11:26 pm

1 stop7h 16m

Washington, D.C. Dulles Intl

Sun 8/23

6:10 am-1:34 pm

1 stop7h 24m

$229

TorontoWashington, D.C.

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

YYZIAD

Toronto Pearson Intl

Fri 8/21

6:14 pm-11:26 pm

1 stop5h 12m

Washington, D.C. Dulles Intl

Sun 8/23

6:10 am-11:19 am

1 stop5h 09m

$229

TorontoWashington, D.C.

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

YYZIAD

Toronto Pearson Intl

Thu 8/27

12:45 pm-2:22 pm

Nonstop1h 37m

Washington, D.C. Dulles Intl

Tue 9/8

10:19 pm-11:54 pm

Nonstop1h 35m

$232

TorontoWashington, D.C.

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

YYZIAD

Toronto Pearson Intl

Thu 9/17

12:45 pm-2:22 pm

Nonstop1h 37m

Washington, D.C. Dulles Intl

Sun 9/20

1:10 pm-8:44 pm

1 stop7h 34m

$232

TorontoWashington, D.C.

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

YYZIAD

Toronto Pearson Intl

Fri 8/28

7:00 am-1:55 pm

1 stop6h 55m

Washington, D.C. Dulles Intl

Mon 8/31

4:20 pm-5:50 pm

Nonstop1h 30m

$234

TorontoWashington, D.C.

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

YYZIAD

Toronto Pearson Intl

Fri 8/21

7:00 am-11:52 am

1 stop4h 52m

Washington, D.C. Dulles Intl

Sun 8/23

8:28 am-10:04 am

Nonstop1h 36m

$237

TorontoWashington, D.C.

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

YYZIAD

Toronto Pearson Intl

Sun 10/11

7:00 am-11:55 am

1 stop4h 55m

Washington, D.C. Dulles Intl

Wed 10/14

12:43 pm-2:19 pm

Nonstop1h 36m

$238

TorontoWashington, D.C.

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

YYZIAD

Toronto Pearson Intl

Fri 9/11

8:50 am-1:55 pm

1 stop5h 05m

Washington, D.C. Dulles Intl

Sun 9/13

8:20 am-1:42 pm

1 stop5h 22m

$238

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/4

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 $271). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $332). 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 August 5, 2026.

One of the essential ways to save on airfare from Region of Ontario to Washington, D.C. Dulles Intl Airport is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the afternoon could potentially save you up to 44% on airfare.

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 August 5, 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?

Airfare is below average for this route at the moment.
Region of Ontario to Washington, D.C. Dulles Intl Airport flights typically cost between $268 and $408 in September.
The cheapest round-trip price found within the last 5 days was $202 on Air Canada (Sep 16-Sep 23).

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

The best time to book flights from Region of Ontario to Washington, D.C. Dulles Intl Airport is 34 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 August 1, 2026.

Travelers seeking maximum savings on their Region of Ontario to Washington, D.C. Dulles Intl Airport flight should consider departing on Sunday evenings when fares are most often at their lowest. Sunday afternoons 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?

    Porter Airlines, Air Canada, and Delta can get you from Region of Ontario to Washington, D.C. Dulles Intl Airport in just under 1h 23m. Your travel time can differ by up to 5h 53m. The distance between Region of Ontario and Washington, D.C. Dulles Intl Airport is about 339 mi. When browsing for deals, the options you’ll see will be for both nonstop 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?

    For one-way options, check prices for Porter Airlines. According to our data, you can fly for as low as $117. Users have also found prices from $120 and $134 on Air Canada and United Airlines, respectively.

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

    Most travelers choose 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 when deciding on the best route from Region of Ontario to Washington, D.C. Dulles Intl Airport.

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

    Before booking your flight to Washington, D.C. Dulles Intl Airport from Region of Ontario, check out the most reliable airlines to get you to your destination on time: Republic Airways (81%), Copa Airlines (80%), United Airlines( 79%).

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

    On average you can expect to pay $715 for a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $138 while the most popular route, (Toronto Pearson Intl - Washington, D.C. Dulles Intl) is currently priced at $194.

  • 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 $271). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $332). 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

Traveling 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
Alexandria
Owings Mills
Arlington
Tysons
Springfield
Lanham
Reston
Herndon
Rockville
Chantilly
Hyattsville
Fredericksburg
Falls Church
Hanover
Laurel
Sterling
Clinton
Oxon Hill
Hunt Valley
Woodbridge

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Top 3 airlines flying from Ontario to Dulles Intl

Discover the top 3 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 2,558,603 searches. Data last updated August 5, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$160Average$376FlexibilityNo cancel feeOn-time69%
Porter AirlinesCheapest$189Average$250FlexibilityNo cancel feeOn-time52%
Air CanadaCheapest$198Average$392FlexibilityNo cancel feeOn-time67%

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