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$78+ Cheap flights from Dulles Intl (IAD) to Ontario

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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — YYZ
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap flight deals from Dulles Intl to Ontario

Keep the following information in mind while searching for Dulles Intl to Ontario flight deals. Data was last updated July 29, 2025.

Round-trip from

$194
(Kiwi.com)

One-way from

$78
(eDestinos)

Popular in

November

Cheapest in

June

Average price

$286

Good round-trip deal

$217 or less

Good one-way deal

$85 or less
From Washington, D.C. Dulles Intl to Ontario
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One-way flight from Washington, D.C. Dulles Intl to Ontario
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Highest demand for flights based on searches. 4% potential increase in price ($13 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Ontario.
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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Ontario.
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Find flight deals from Dulles Intl to Ontario

Cheapest flights from Dulles Intl to Ontario
Explore the most affordable flight options available from Dulles Intl to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/26. 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.
Sat 8/304:10 pmIAD - YTZ
Nonstop1h 33mPorter Airlines
Sun 8/319:05 amYTZ - IAD
Nonstop1h 31mPorter Airlines
Deal found 7/26$194
This Flightnetwork deal was found by Cheapflights users on 7/28. 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.
Tue 8/199:35 amIAD - YYZ
1 stop5h 00mAir Canada
Tue 8/264:30 pmYYZ - IAD
1 stop4h 31mAir Canada
Deal found 7/28$208
This Trip.com deal was found by Cheapflights users on 7/26. 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.
Wed 9/34:20 pmIAD - YTZ
Nonstop1h 33mMultiple Airlines
Mon 9/88:45 amYTZ - IAD
Nonstop1h 31mMultiple Airlines
Deal found 7/26$222
This Gotogate deal was found by Cheapflights users on 7/28. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/199:35 amIAD - YTZ
1 stop5h 11mAir Canada
Tue 8/263:25 pmYTZ - IAD
1 stop5h 36mAir Canada
Deal found 7/28$228
This Booking.com deal was found by Cheapflights users on 7/27. 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.
Sat 8/304:10 pmIAD - YTZ
Nonstop1h 33mAir Transat
Sun 8/311:25 pmYTZ - IAD
Nonstop1h 31mAir Transat
Deal found 7/27$241
This Trip.com deal was found by Cheapflights users on 7/27. 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 9/116:20 amIAD - YYZ
1 stop5h 24mUnited Airlines
Thu 9/1812:45 pmYYZ - IAD
Nonstop1h 40mUnited Airlines
Deal found 7/27$247
This Kiwi.com deal was found by Cheapflights users on 7/26. 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.
Fri 10/1011:35 amIAD - YUL
1 stop4h 25mPorter Airlines
Tue 10/1410:45 amYUL - IAD
1 stop4h 21mPorter Airlines
Deal found 7/26$262
This Gotogate deal was found by Cheapflights users on 7/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/109:35 amIAD - YUL
Nonstop1h 53mAir Canada
Wed 9/177:10 pmYUL - IAD
Nonstop1h 55mAir Canada
Deal found 7/27$263
This Delta deal was found by Cheapflights users on 7/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/185:11 pmIAD - YYZ
1 stop5h 47mDelta
Fri 8/296:13 pmYYZ - IAD
1 stop5h 13mDelta
Deal found 7/27$270
This United deal was found by Cheapflights users on 7/26. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/43:41 pmIAD - YYZ
Nonstop1h 38mMultiple Airlines
Sun 9/78:10 amYYZ - IAD
Nonstop1h 28mMultiple Airlines
Deal found 7/26$277
This Mytrip deal was found by Cheapflights users on 7/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/224:10 pmIAD - YOW
1 stop3h 28mPorter Airlines
Mon 8/259:35 amYOW - IAD
1 stop5h 21mPorter Airlines
Deal found 7/27$292
This Gotogate deal was found by Cheapflights users on 7/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2211:35 amIAD - YUL
1 stop7h 45mMultiple Airlines
Mon 9/298:55 amYUL - IAD
1 stop6h 11mMultiple Airlines
Deal found 7/27$305

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Ontario 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 July 29, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Ontario that are best for you.

Fly from

Dulles Intl

Fly to

Ontario

Route

Depart

Return

Price

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Sat 8/30

4:10 pm-5:43 pm

Nonstop1h 33m

Toronto Island

Sun 8/31

9:05 am-10:36 am

Nonstop1h 31m

$194

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Thu 9/4

10:20 am-11:52 am

Nonstop1h 32m

Toronto Pearson Intl

Sun 9/7

8:10 am-9:38 am

Nonstop1h 28m

$203

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Wed 9/3

4:20 pm-5:53 pm

Nonstop1h 33m

Toronto Island

Mon 9/8

8:45 am-10:16 am

Nonstop1h 31m

$222

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Sat 8/30

4:10 pm-5:43 pm

Nonstop1h 33m

Toronto Island

Sun 8/31

1:25 pm-2:56 pm

Nonstop1h 31m

$241

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Thu 9/11

6:20 am-11:44 am

1 stop5h 24m

Toronto Pearson Intl

Thu 9/18

12:45 pm-2:25 pm

Nonstop1h 40m

$247

Washington, D.C.Montreal

IAD - YUL

IADYUL

Washington, D.C. Dulles Intl

Fri 10/10

11:35 am-4:00 pm

1 stop4h 25m

Montreal Pierre Elliott Trudeau Intl

Tue 10/14

10:45 am-3:06 pm

1 stop4h 21m

$262

Washington, D.C.Montreal

IAD - YUL

IADYUL

Washington, D.C. Dulles Intl

Wed 9/10

9:35 am-11:28 am

Nonstop1h 53m

Montreal Pierre Elliott Trudeau Intl

Wed 9/17

7:10 pm-9:05 pm

Nonstop1h 55m

$263

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Mon 8/18

5:11 pm-10:58 pm

1 stop5h 47m

Toronto Pearson Intl

Wed 8/20

4:11 pm-10:55 pm

1 stop6h 44m

$270

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Thu 9/4

8:40 am-1:47 pm

1 stop5h 07m

Toronto Pearson Intl

Sun 9/7

8:10 am-9:38 am

Nonstop1h 28m

$277

Washington, D.C.Ottawa

IAD - YOW

IADYOW

Washington, D.C. Dulles Intl

Fri 8/22

4:10 pm-7:38 pm

1 stop3h 28m

Ottawa

Mon 8/25

9:35 am-2:56 pm

1 stop5h 21m

$292

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Showing 1-10 of 55 results
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Best time to book a flight from Dulles Intl to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to Ontario

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario (average of $243). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in August is currently the most expensive (average of $348). 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 IAD to ON?

Find hourly flight availability from Dulles Intl to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

When flying from Washington, D.C. Dulles Intl Airport to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to Region of Ontario

Explore weekly flight availability from Dulles Intl to Ontario. 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 July 29, 2025.

The most flights from IAD to CAON are scheduled on a Friday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).

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

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated July 29, 2025.
Get a feel of what it's like to fly with Porter Airlines, Delta, and Air Transat from Washington, D.C. Dulles Intl Airport to Ontario by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Crew

8.7

Entertainment

7.0

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Porter Airlines
8.0
Very good
317 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Crew

8.7

Entertainment

7.0

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Delta
8.0
Very good
7,979 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Crew

8.7

Entertainment

7.0

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Air Transat
7.7
Good
424 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Crew

8.7

Entertainment

7.0

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
United Airlines
7.4
Good
8,896 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Crew

8.7

Entertainment

7.0

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
WestJet
7.2
Good
2,972 reviews
Porter Airlines
8.0
Very good
317 reviews

Boarding

8.2

Crew

8.7

Entertainment

7.0

Overall

8.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Region of Ontario one-way?

    The cheapest airline one-way is Porter Airlines, with whom users have recently found tickets for as low as $84. However, be on the lookout for offers from Air Canada and Air Transat, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to Region of Ontario for a low price.

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

    The most popular flight routes from Washington, D.C. Dulles Intl Airport to Region of Ontario are Washington, D.C. Dulles Intl - Toronto Pearson Intl, Washington, D.C. Dulles Intl - Toronto Island and Washington, D.C. Dulles Intl - Montreal Pierre Elliott Trudeau Intl.

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

    No one likes to see their flight delayed. When booking a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario consider choosing ANA (89%), United Airlines (78%) or Republic Airways (76%) as they are the most reliable in getting you off to your destination on time.

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

    On average you can expect to pay $2,596 for a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario. The cheapest flight overall is $106 while the most popular route, (Washington, D.C. Dulles Intl - Toronto Pearson Intl) is currently priced at $245.

  • Can I find deals for flights from Dulles Intl to Ontario that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Ontario.

  • Can I find deals for business class flights from Dulles Intl to Ontario?

    Yes. Cheapflights offers flight deals from Dulles Intl to Ontario 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 Washington, D.C. Dulles Intl Airport to Region of Ontario?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario (average of $243). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in August is currently the most expensive (average of $348). 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

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Alternative routes for Dulles Intl to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Pearson Intl flights
Reagan-National to Pearson Intl flights
Reagan-National to Pierre Elliott Trudeau Intl flights
Dulles Intl to Toronto Island flights
Dulles Intl to Pierre Elliott Trudeau Intl flights
Baltimore to Pearson Intl flights
Dulles Intl to Vancouver Intl flights
Dulles Intl to Calgary flights
Reagan-National to Vancouver Intl flights
Baltimore to Pierre Elliott Trudeau Intl flights
Baltimore to Vancouver Intl flights
Baltimore to Calgary flights
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Reagan-National to Toronto Island flights
Dulles Intl to St. John's flights
Reagan-National to Calgary flights
Reagan-National to St. John's flights
Baltimore to St. John's flights
Baltimore to Toronto Island flights
Reagan-National to Halifax flights
Dulles Intl to Québec City flights
Reagan-National to Québec City flights
Baltimore to Halifax flights
Dulles Intl to Abbotsford flights
Dulles Intl to Ottawa flights
Baltimore to Québec City flights
Dulles Intl to Edmonton flights
Baltimore to Abbotsford flights
Reagan-National to Ottawa flights
Dulles Intl to Winnipeg flights
Baltimore to Edmonton flights
Dulles Intl to Hamilton flights
Baltimore to Winnipeg flights
Reagan-National to Edmonton flights
Reagan-National to Abbotsford flights
Baltimore to Ottawa flights
Dulles Intl to Victoria flights
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Reagan-National to Winnipeg flights
Baltimore to Victoria flights
Reagan-National to Charlottetown flights
Dulles Intl to Charlottetown flights
Baltimore to Saskatoon flights
Baltimore to Charlottetown flights
Reagan-National to Saskatoon flights
Reagan-National to Victoria flights
Dulles Intl to Kelowna flights
Dulles Intl to Nanaimo flights
Dulles Intl to Moncton flights

Top 5 airlines flying from Dulles Intl to Ontario

Discover the top 5 airlines that operate flights from Dulles Intl to Ontario. 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$109Average$332FlexibilityNo cancel feeOn-time52%
Air CanadaCheapest$137Average$410FlexibilityNo cancel feeOn-time67%
Air TransatCheapest$169Average$363FlexibilityNo cancel feeOn-time50%
United AirlinesCheapest$235Average$416FlexibilityNo cancel feeOn-time69%
WestJetCheapest$278Average$636FlexibilityNo cancel feeOn-time60%

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