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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 7/28. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — IAD
Jul 19 — Jul 261
Sun 7/19
Sun 7/26
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 June 19, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 6/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/171:40 pm
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Tue 7/2111:05 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/18$206
This Cheapflightsfares deal was found by Cheapflights users on 6/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/168:55 am
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Mon 7/203:55 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/19$207
This Cheapflightsfares deal was found by Cheapflights users on 6/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/171:40 pm
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Wed 7/2211:05 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/16$208
This SmartFares deal was found by Cheapflights users on 6/15. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/91:40 pm
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Sun 7/123:55 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/15$209
This Cheapflightsfares deal was found by Cheapflights users on 6/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/78:55 am
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Tue 7/1411:05 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/18$210
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/31:40 pm
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Tue 7/711:05 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/15$211
This Cheapflightsfares deal was found by Cheapflights users on 6/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/309:15 am
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Tue 7/711:05 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/15$212
This Flightnetwork deal was found by Cheapflights users on 6/19. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/101:40 pm
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Sun 7/123:55 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/19$213
This Cheapflightsfares deal was found by Cheapflights users on 6/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:55 am
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Mon 7/611:05 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/17$214
This United Airlines deal was found by Cheapflights users on 6/18. 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.
Tue 10/65:27 pm
YYZ
-
IAD
1 stop5h 25m
United Airlines
Wed 10/78:28 am
IAD
-
YYZ
Nonstop1h 36m
United Airlines
Deal found 6/18$216
This FlightHub deal was found by Cheapflights users on 6/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/111:40 pm
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Wed 7/1511:05 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 6/19$217
This United Airlines deal was found by Cheapflights users on 6/17. 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.
Mon 9/147:43 pm
YYZ
-
IAD
Nonstop1h 41m
United Airlines
Tue 9/158:20 am
IAD
-
YYZ
1 stop7h 26m
United Airlines
Deal found 6/17$234

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 June 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$206
(Cheapflightsfares)

One-way from

$131
(Mytrip)

Popular in

March

Cheapest in

August

Average price

$256

Good round-trip deal

$191 or less

Good one-way deal

$139 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. 12% potential increase in price ($37 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 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 2,558,603 searches. Data last updated June 19, 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

Thu 7/16

8:55 am-10:25 am

Nonstop1h 30m

Washington, D.C. Dulles Intl

Wed 8/5

11:25 am-12:55 pm

Nonstop1h 30m

$236

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 7/3

1:40 pm-3:11 pm

Nonstop1h 31m

Washington, D.C. Dulles Intl

Sun 7/5

11:05 am-12:35 pm

Nonstop1h 30m

$241

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 7/24

8:30 am-3:01 pm

1 stop6h 31m

Washington, D.C. Dulles Intl

Sun 7/26

5:15 pm-6:46 pm

Nonstop1h 31m

$243

TorontoWashington, D.C.

YYZ - IAD

YYZIAD

Toronto Pearson Intl

Fri 7/24

1:55 pm-3:24 pm

Nonstop1h 29m

Washington, D.C. Dulles Intl

Mon 7/27

4:20 pm-5:50 pm

Nonstop1h 30m

$243

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 7/3

1:40 pm-3:11 pm

Nonstop1h 31m

Washington, D.C. Dulles Intl

Mon 7/6

11:05 am-12:35 pm

Nonstop1h 30m

$243

TorontoWashington, D.C.

YYZ - IAD

YYZIAD

Toronto Pearson Intl

Thu 9/3

9:44 am-11:21 am

Nonstop1h 37m

Washington, D.C. Dulles Intl

Mon 9/7

12:43 pm-2:19 pm

Nonstop1h 36m

$257

TorontoWashington, D.C.

YYZ - IAD

YYZIAD

Toronto Pearson Intl

Wed 7/1

7:43 pm-9:26 pm

Nonstop1h 43m

Washington, D.C. Dulles Intl

Sun 7/5

10:14 pm-11:54 pm

Nonstop1h 40m

$276

TorontoWashington, D.C.

YYZ - IAD

YYZIAD

Toronto Pearson Intl

Thu 8/13

12:45 pm-2:22 pm

Nonstop1h 37m

Washington, D.C. Dulles Intl

Tue 8/18

1:13 pm-8:44 pm

1 stop7h 31m

$276

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Thu 7/2

8:55 am-10:25 am

Nonstop1h 30m

Washington, D.C. Dulles Intl

Sat 7/25

11:05 am-12:35 pm

Nonstop1h 30m

$281

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Wed 8/12

9:15 am-10:45 am

Nonstop1h 30m

Washington, D.C. Dulles Intl

Sat 8/15

11:25 am-12:55 pm

Nonstop1h 30m

$284

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/17

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 $87). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in January is currently the most expensive (average of $168). 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 June 19, 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 42% 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 June 19, 2026.

The most flights from CAON to IAD are scheduled on a Wednesday (20 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 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 June 13, 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. Wednesday evenings 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 United Airlines can get you from Region of Ontario to Washington, D.C. Dulles Intl Airport in just under 1h 30m. Your travel time can differ by up to 5h 01m. 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 $101. 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: Avianca (92%), Copa Airlines (91%), Republic Airways( 91%).

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

    On average you can expect to pay $341 for a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $149 while the most popular route, (Toronto Pearson Intl - Washington, D.C. Dulles Intl) is currently priced at $234.

  • 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 $87). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in January is currently the most expensive (average of $168). 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
Arlington
Tysons
Owings Mills
Springfield
Lanham
Reston
Herndon
Rockville
Hyattsville
Manassas
Fredericksburg
Laurel
Hanover
Chantilly
Falls Church
Waldorf
Silver Spring
Largo
Clinton

Browse thousands of different options on Cheapflights for your next trip

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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 June 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$134Average$376FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$181Average$389FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$189Average$330FlexibilityNo cancel feeOn-time52%

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