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Dulles Intl

$128+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — IAD
Apr 17 — Apr 241
Fri 4/17
Fri 4/24
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 March 18, 2026.

This Trip.com deal was found by Cheapflights users on 3/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/99:25 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
Mon 4/1311:40 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/17$203
This Trip.com deal was found by Cheapflights users on 3/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1111:30 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
Fri 4/176:00 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/17$204
This Trip.com deal was found by Cheapflights users on 3/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/79:25 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
Sun 4/126:00 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/15$205
This FlightHub deal was found by Cheapflights users on 3/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/139:25 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
Fri 4/246:00 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/17$206
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/229:25 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
Sat 4/251:45 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/16$211
This FlightHub deal was found by Cheapflights users on 3/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1111:30 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
Tue 4/1411:40 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/17$212
This Kiwi.com deal was found by Cheapflights users on 3/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/149:25 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
Thu 4/2311:40 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/17$215
This FlightHub deal was found by Cheapflights users on 3/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/149:15 am
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Sat 5/1611:30 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/17$219
This Trip.com deal was found by Cheapflights users on 3/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/19:25 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
Wed 4/811:40 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/17$221
This Trip.com deal was found by Cheapflights users on 3/17. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/151:50 pm
YTZ
-
IAD
Nonstop1h 31m
Porter Airlines
Sun 5/244:05 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 3/17$222
This Air Canada deal was found by Cheapflights users on 3/18. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/271:55 pm
YYZ
-
IAD
Nonstop1h 34m
Air Canada
Tue 6/24:05 pm
IAD
-
YYZ
Nonstop1h 25m
Air Canada
Deal found 3/18$232
This Air Canada deal was found by Cheapflights users on 3/17. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/246:55 pm
YYZ
-
IAD
Nonstop1h 34m
Air Canada
Mon 4/279:00 am
IAD
-
YYZ
Nonstop1h 27m
Air Canada
Deal found 3/17$233

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 March 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$203
(Trip.com)

One-way from

$128
(FlightHub)

Popular in

March

Cheapest in

October

Average price

$320

Good round-trip deal

$120 or less

Good one-way deal

$123 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. 8% potential increase in price ($23 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 March 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 March 18, 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

Sun 5/10

1:50 pm-3:21 pm

Nonstop1h 31m

Washington, D.C. Dulles Intl

Wed 5/13

4:05 pm-5:35 pm

Nonstop1h 30m

$229
Quickest round-trip

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Thu 4/16

9:25 am-10:54 am

Nonstop1h 29m

Washington, D.C. Dulles Intl

Mon 4/20

11:40 am-1:10 pm

Nonstop1h 30m

$249

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 6/12

9:15 am-10:46 am

Nonstop1h 31m

Washington, D.C. Dulles Intl

Mon 6/15

11:30 am-1:00 pm

Nonstop1h 30m

$250

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Mon 7/27

9:15 am-10:46 am

Nonstop1h 31m

Washington, D.C. Dulles Intl

Wed 7/29

4:00 pm-5:30 pm

Nonstop1h 30m

$256

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Wed 4/1

9:25 am-10:54 am

Nonstop1h 29m

Washington, D.C. Dulles Intl

Sat 4/4

1:45 pm-3:15 pm

Nonstop1h 30m

$258

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 5/1

9:30 am-3:03 pm

1 stop5h 33m

Washington, D.C. Dulles Intl

Fri 5/8

3:45 pm-9:32 pm

1 stop5h 47m

$262

TorontoWashington, D.C.

YYZ - IAD

YYZIAD

Toronto Pearson Intl

Thu 4/16

6:00 am-12:05 pm

1 stop6h 05m

Washington, D.C. Dulles Intl

Mon 4/20

6:00 am-1:24 pm

1 stop7h 24m

$265

TorontoWashington, D.C.

YYZ - IAD

YYZIAD

Toronto Pearson Intl

Tue 4/14

12:16 pm-4:15 pm

1 stop3h 59m

Washington, D.C. Dulles Intl

Tue 4/21

5:07 pm-10:56 pm

1 stop5h 49m

$265

TorontoWashington, D.C.

YYZ - IAD

YYZIAD

Toronto Pearson Intl

Wed 4/22

6:11 pm-11:03 pm

1 stop4h 52m

Washington, D.C. Dulles Intl

Tue 5/5

11:04 am-3:20 pm

1 stop4h 16m

$265

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

Fri 5/1

9:15 am-10:46 am

Nonstop1h 31m

Washington, D.C. Dulles Intl

Fri 5/8

4:05 pm-5:35 pm

Nonstop1h 30m

$265

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/17

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, May is the cheapest month in which you can book a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport (average of $134). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $212). 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 March 18, 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 at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 41% on airfare.

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 March 14, 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. Thursday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 March 18, 2026.

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

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

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 29m. Your travel time can differ by up to 2h 56m. 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 $89. Users have also found prices from $117 and $132 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 (70%), Copa Airlines (70%), Republic Airways( 70%).

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

    On average you can expect to pay $445 for a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $160 while the most popular route, (Toronto Pearson Intl - Washington, D.C. Dulles Intl) is currently priced at $243.

  • 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, May is the cheapest month in which you can book a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport (average of $134). Flying from Region of Ontario to Washington, D.C. Dulles Intl Airport in December is currently the most expensive (average of $212). 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
Woodbridge
Tysons
Owings Mills
Arlington
Springfield
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
Fredericksburg
Largo
Bowie
Clinton
Towson
College Park
Cordova

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 March 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$146Average$351FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$171Average$361FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$189Average$329FlexibilityNo cancel feeOn-time52%

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