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Dulles Intl

$123+ 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 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — IAD
feb. 25 — mar. 41
mié. 2/25
mié. 3/4
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 enero 26, 2026.

This FlightHub deal was found by Cheapflights users on 1/26. 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.
vie. 4/108:55 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
dom. 4/126:30 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 1/26$197
This Trip.com deal was found by Cheapflights users on 1/26. 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.
lun. 3/28:55 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
vie. 3/66:30 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 1/26$203
This Trip.com deal was found by Cheapflights users on 1/25. 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.
jue. 2/198:50 am
YTZ
-
IAD
Nonstop1h 32m
Porter Airlines
dom. 2/226:30 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 1/25$205
This Trip.com deal was found by Cheapflights users on 1/25. 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.
vie. 2/203:45 pm
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
lun. 2/2311:40 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 1/25$207
This Trip.com deal was found by Cheapflights users on 1/24. 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.
sáb. 2/1411:05 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
dom. 2/156:30 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 1/24$209
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
sáb. 2/1411:05 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
dom. 2/226:30 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 1/26$210
This FlightHub deal was found by Cheapflights users on 1/25. 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.
vie. 3/203:45 pm
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
sáb. 4/41:45 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 1/25$211
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
mié. 3/48:55 am
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
sáb. 3/141:45 pm
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 1/26$212
This Trip.com deal was found by Cheapflights users on 1/26. 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.
dom. 3/83:45 pm
YTZ
-
IAD
Nonstop1h 29m
Porter Airlines
lun. 3/911:40 am
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Deal found 1/26$214
This United Airlines deal was found by Cheapflights users on 1/26. 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.
jue. 5/1412:45 pm
YYZ
-
IAD
Nonstop1h 39m
United Airlines
sáb. 5/168:19 am
IAD
-
YYZ
Nonstop1h 45m
United Airlines
Deal found 1/26$240
This Kissandfly.com deal was found by Cheapflights users on 1/24. 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.
sáb. 2/147:40 pm
YYZ
-
IAD
Nonstop1h 41m
Lufthansa
dom. 2/158:15 am
IAD
-
YYZ
1 stop5h 46m
Lufthansa
Deal found 1/24$251
This United Airlines deal was found by Cheapflights users on 1/23. 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.
dom. 3/297:00 pm
YYZ
-
IAD
1 stop4h 25m
United Airlines
dom. 4/512:40 pm
IAD
-
YYZ
Nonstop1h 39m
United Airlines
Deal found 1/23$254

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 enero 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$197
(FlightHub)

One-way from

$123
(SmartFares)

Popular in

June

Cheapest in

October

Average price

$277

Good round-trip deal

$126 or less

Good one-way deal

$132 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 ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 enero 26, 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

Ontario

Fly to

Dulles Intl

Route

Depart

Return

Price

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

vie. 2/20

3:45 pm-5:14 pm

Nonstop1h 29m

Washington, D.C. Dulles Intl

dom. 2/22

6:30 pm-8:00 pm

Nonstop1h 30m

$206

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

jue. 2/19

8:50 am-10:22 am

Nonstop1h 32m

Washington, D.C. Dulles Intl

dom. 2/22

6:30 pm-8:00 pm

Nonstop1h 30m

$206

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

mié. 3/11

8:55 am-10:24 am

Nonstop1h 29m

Washington, D.C. Dulles Intl

mié. 3/18

11:40 am-1:10 pm

Nonstop1h 30m

$207

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

vie. 2/20

3:45 pm-5:14 pm

Nonstop1h 29m

Washington, D.C. Dulles Intl

lun. 2/23

11:40 am-1:10 pm

Nonstop1h 30m

$207

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

vie. 3/20

3:45 pm-5:14 pm

Nonstop1h 29m

Washington, D.C. Dulles Intl

sáb. 4/4

1:45 pm-3:15 pm

Nonstop1h 30m

$211

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

dom. 3/29

3:45 pm-5:14 pm

Nonstop1h 29m

Washington, D.C. Dulles Intl

mié. 4/1

11:40 am-1:10 pm

Nonstop1h 30m

$218

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

vie. 2/27

3:45 pm-5:14 pm

Nonstop1h 29m

Washington, D.C. Dulles Intl

vie. 3/6

6:30 pm-8:00 pm

Nonstop1h 30m

$218

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

mié. 4/1

8:55 am-10:24 am

Nonstop1h 29m

Washington, D.C. Dulles Intl

dom. 4/5

11:40 am-1:10 pm

Nonstop1h 30m

$221

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

jue. 2/19

7:00 am-7:12 pm

2 stops12h 12m

Washington, D.C. Dulles Intl

dom. 2/22

6:30 pm-8:00 pm

Nonstop1h 30m

$230

TorontoWashington, D.C.

YTZ - IAD

YTZIAD

Toronto Island

vie. 4/10

8:55 am-10:24 am

Nonstop1h 29m

Washington, D.C. Dulles Intl

dom. 4/12

6:30 pm-8:00 pm

Nonstop1h 30m

$231

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 60 results
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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, February is the cheapest month in which you can book a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport (average of $131). 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 enero 26, 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 44% 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 January 24, 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 enero 26, 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, United Airlines, and Air Canada can get you from Region of Ontario to Washington, D.C. Dulles Intl Airport in just under 1h 29m. Your travel time will be generally consistent. The distance between Region of Ontario and Washington, D.C. Dulles Intl Airport is about 339 mi. Most flights are nonstop.

  • 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 $116 and $125 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, Montreal Pierre Elliott Trudeau Intl - Washington, D.C. Dulles Intl or Toronto Island - 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 (68%), Copa Airlines (68%), Republic Airways( 68%).

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

    On average you can expect to pay $631 for a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $121 while the most popular route, (Toronto Pearson Intl - Washington, D.C. Dulles Intl) is currently priced at $240.

  • 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, February is the cheapest month in which you can book a flight from Region of Ontario to Washington, D.C. Dulles Intl Airport (average of $131). 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
Arlington
Owings Mills
Springfield
Silver Spring
Herndon
Fredericksburg
Hanover
Linthicum Heights
Rockville
Laurel
Towson
Manassas
Largo
Bowie
McLean
Clinton
Upper Marlboro

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
Pearson Intl to Baltimore flights
Vancouver Intl to Dulles Intl flights
Pierre Elliott Trudeau Intl to Dulles Intl flights
Toronto Island to Dulles Intl flights
Pierre Elliott Trudeau Intl to Reagan-National flights
Ottawa to Dulles Intl flights
Ottawa to Reagan-National flights
Vancouver Intl to Reagan-National flights
Pierre Elliott Trudeau Intl to Baltimore flights
Vancouver Intl to Baltimore flights
Toronto Island to Reagan-National flights
Ottawa to Baltimore flights
Calgary to Baltimore flights
Calgary to Dulles Intl flights
Toronto Island to Baltimore flights
Calgary to Reagan-National flights
Halifax to Reagan-National flights
Halifax to Dulles Intl flights
Edmonton to Dulles Intl flights
Edmonton to Baltimore flights
Winnipeg to Dulles Intl flights
Edmonton to Reagan-National flights
Winnipeg to Reagan-National flights
Winnipeg to Baltimore flights
Québec City to Baltimore flights
St. John's to Dulles Intl flights
Québec City to Dulles Intl flights
St. John's to Baltimore flights
St. John's to Reagan-National flights
Québec City to Reagan-National flights
Kelowna to Reagan-National flights
Kelowna to Dulles Intl flights
Halifax to Baltimore flights
Moncton to Dulles Intl flights
Regina to Baltimore flights
Victoria to Dulles Intl flights
Victoria to Reagan-National flights
Victoria to Baltimore flights
Kelowna to Baltimore flights
Fort McMurray to Reagan-National flights
London to Dulles Intl flights
Whitehorse to Dulles Intl flights
Deer Lake to Baltimore flights
London to Reagan-National flights
London to Baltimore flights
Saskatoon to Reagan-National flights
Saskatoon to Baltimore flights

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 enero 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$146Average$364FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$171Average$357FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$174Average$319FlexibilityNo cancel feeOn-time52%

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