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$88+ 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 5/16. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — YYZ
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$180
(United Airlines)

One-way from

$88
(Booking.com)

Popular in

August

Cheapest in

April

Average price

$325

Good round-trip deal

$218 or less

Good one-way deal

$105 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Toronto (YTO) flights.
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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. 1% potential increase in price ($3 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 28, 2025.

This United Airlines deal was found by Cheapflights users on 3/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/292:25 pmIAD - YYZ
Nonstop1h 34mUnited Airlines
Thu 5/296:20 pmYYZ - IAD
1 stop3h 02mUnited Airlines
Deal found 3/27$180
This Porter Airlines deal was found by Cheapflights users on 3/27. 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 Porter Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1211:35 amIAD - YTZ
Nonstop1h 33mPorter Airlines
Sun 6/88:45 amYTZ - IAD
Nonstop1h 31mPorter Airlines
Deal found 3/27$181
This Flightnetwork deal was found by Cheapflights users on 3/27. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/116:22 amIAD - YYZ
1 stop5h 53mAir Canada
Sun 5/187:00 amYYZ - IAD
1 stop4h 14mAir Canada
Deal found 3/27$188
This Mytrip deal was found by Cheapflights users on 3/27. 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.
Sun 5/1111:35 amIAD - YUL
1 stop4h 25mMultiple Airlines
Sun 5/189:15 amYUL - IAD
1 stop4h 26mMultiple Airlines
Deal found 3/27$189
This Air Canada deal was found by Cheapflights users on 3/26. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/194:07 pmIAD - YTZ
1 stop5h 28mAir Canada
Tue 4/224:20 pmYTZ - IAD
1 stop4h 55mAir Canada
Deal found 3/26$191
This United deal was found by Cheapflights users on 3/27. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/148:25 amIAD - YYZ
Nonstop1h 39mMultiple Airlines
Sat 6/74:00 pmYYZ - IAD
1 stop5h 04mMultiple Airlines
Deal found 3/27$193
This Flightnetwork deal was found by Cheapflights users on 3/27. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/247:00 amIAD - YUL
1 stop4h 15mPorter Airlines
Sun 4/276:40 pmYUL - IAD
1 stop3h 44mPorter Airlines
Deal found 3/27$196
This Trip.com deal was found by Cheapflights users on 3/27. 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 6/124:20 pmIAD - YTZ
Nonstop1h 33mAir Transat
Sun 6/151:35 pmYTZ - IAD
Nonstop1h 31mAir Transat
Deal found 3/27$202
This Cheapflightsfares deal was found by Cheapflights users on 3/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/274:20 pmIAD - YTZ
Nonstop1h 33mMultiple Airlines
Wed 7/21:35 pmYTZ - IAD
Nonstop1h 31mMultiple Airlines
Deal found 3/27$204
This Mytrip deal was found by Cheapflights users on 3/27. 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.
Sun 5/114:20 pmIAD - YOW
1 stop4h 18mPorter Airlines
Sun 5/188:35 amYOW - IAD
1 stop6h 31mPorter Airlines
Deal found 3/27$209
This Booking.com deal was found by Cheapflights users on 3/27. 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.
Wed 5/71:53 pmIAD - YUL
Nonstop1h 57mAir Canada
Mon 5/1211:15 amYUL - IAD
Nonstop1h 59mAir Canada
Deal found 3/27$212
This Mytrip deal was found by Cheapflights users on 3/27. 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.
Sat 6/143:30 pmIAD - YOW
1 stop5h 39mMultiple Airlines
Mon 6/168:35 amYOW - IAD
1 stop6h 31mMultiple Airlines
Deal found 3/27$215

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 March 28, 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 - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Thu 5/29

2:25 pm-3:59 pm

Nonstop1h 34m

Toronto Pearson Intl

Thu 5/29

6:20 pm-9:22 pm

1 stop3h 02m

$180

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Mon 5/12

11:35 am-1:08 pm

Nonstop1h 33m

Toronto Island

Sun 6/8

8:45 am-10:16 am

Nonstop1h 31m

$181

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Sun 5/11

6:22 am-12:15 pm

1 stop5h 53m

Toronto Pearson Intl

Sun 5/18

7:00 am-11:14 am

1 stop4h 14m

$188

Washington, D.C.Montreal

IAD - YUL

IADYUL

Washington, D.C. Dulles Intl

Sun 5/11

11:35 am-4:00 pm

1 stop4h 25m

Montreal Pierre Elliott Trudeau Intl

Sun 5/18

9:15 am-1:41 pm

1 stop4h 26m

$189

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Sat 4/19

4:07 pm-9:35 pm

1 stop5h 28m

Toronto Island

Tue 4/22

4:20 pm-9:15 pm

1 stop4h 55m

$191

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Wed 5/14

8:25 am-10:04 am

Nonstop1h 39m

Toronto Pearson Intl

Sat 6/7

4:00 pm-9:04 pm

1 stop5h 04m

$193

Washington, D.C.Montreal

IAD - YUL

IADYUL

Washington, D.C. Dulles Intl

Thu 4/24

7:00 am-11:15 am

1 stop4h 15m

Montreal Pierre Elliott Trudeau Intl

Sun 4/27

6:40 pm-10:24 pm

1 stop3h 44m

$196

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Thu 6/12

4:20 pm-5:53 pm

Nonstop1h 33m

Toronto Island

Sun 6/15

1:35 pm-3:06 pm

Nonstop1h 31m

$202

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Fri 6/27

4:20 pm-5:53 pm

Nonstop1h 33m

Toronto Island

Wed 7/2

1:35 pm-3:06 pm

Nonstop1h 31m

$204

Washington, D.C.Ottawa

IAD - YOW

IADYOW

Washington, D.C. Dulles Intl

Sun 5/11

4:20 pm-8:38 pm

1 stop4h 18m

Ottawa

Sun 5/18

8:35 am-3:06 pm

1 stop6h 31m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 52 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 July is currently the most expensive (average of $359). 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 March 28, 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

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 March 28, 2025.
Peruse reviews from past customers who have flown with Delta, Porter Airlines and Air Transat from Washington, D.C. to Ontario to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,897 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Porter Airlines
7.9
Good
276 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Transat
7.8
Good
381 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,603 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,897 reviews

Boarding

8.2

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding 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 $88. 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 - Montreal Pierre Elliott Trudeau Intl and Washington, D.C. Dulles Intl - Toronto Island.

  • 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 (77%), Copa Airlines (76%) 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 $2,297 for a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario. The cheapest flight overall is $102 while the most popular route, (Washington, D.C. Dulles Intl - Toronto Pearson Intl) is currently priced at $173.

  • 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 July is currently the most expensive (average of $359). 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.

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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 Vancouver Intl flights
Dulles Intl to Pearson Intl flights
Reagan-National to Pearson Intl flights
Dulles Intl to Pierre Elliott Trudeau Intl flights
Reagan-National to Pierre Elliott Trudeau Intl flights
Dulles Intl to Toronto Island flights
Dulles Intl to Calgary flights
Baltimore to Vancouver Intl flights
Baltimore to Pearson Intl flights
Reagan-National to Vancouver Intl flights
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Reagan-National to Calgary flights
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Reagan-National to Ottawa flights
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Reagan-National to Halifax flights
Baltimore to Halifax flights
Dulles Intl to Québec City flights
Reagan-National to Québec City flights
Baltimore to Ottawa flights
Baltimore to Québec City flights
Baltimore to Abbotsford flights
Dulles Intl to Winnipeg flights
Dulles Intl to Edmonton flights
Baltimore to Edmonton flights
Reagan-National to Winnipeg flights
Baltimore to Winnipeg flights
Reagan-National to Edmonton flights
Reagan-National to Abbotsford flights
Dulles Intl to St. John's flights
Dulles Intl to Charlottetown flights
Reagan-National to St. John's flights
Dulles Intl to Victoria flights
Dulles Intl to Kelowna flights
Baltimore to Kelowna flights
Baltimore to St. John's flights
Reagan-National to Kelowna flights
Baltimore to Victoria flights
Reagan-National to Charlottetown flights
Reagan-National to Sydney flights
Reagan-National to Victoria flights
Reagan-National to London flights
Dulles Intl to London flights
Baltimore to London flights
Dulles Intl to Hamilton flights
Baltimore to Charlottetown 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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$125Average$450FlexibilityNo cancel feeOn-time67%
Porter AirlinesCheapest$125Average$358FlexibilityNo cancel feeOn-time52%
United AirlinesCheapest$205Average$457FlexibilityNo cancel feeOn-time69%
Air TransatCheapest$250Average$347FlexibilityNo cancel feeOn-time50%
WestJetCheapest$278Average$478FlexibilityNo cancel feeOn-time60%
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