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 $86. 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 cheapest flights from Washington, D.C. Dulles Intl Airport to Region of Ontario?

On average you can expect to pay $1,885 for a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario. The cheapest flight overall is $98 while the most popular route, (Washington, D.C. Dulles Intl - Toronto Pearson Intl) is currently priced at $198.

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 Sun Country Air (100%), ANA (93%) or Jazz (82%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to Region of Ontario?

When booking a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario, you may want to consider flying on Air Canada, Porter Airlines or United Airlines as they are the most popular for this route.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario?

Travelers have found it’s best to book a flight 44 days in advance to save up to 119% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 44 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario 1-2 weeks in advance for as low as $329, or $611 for flights within the next 24 hours.

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

The best pricing can be found in the month of April. Prices to Region of Ontario from Washington, D.C. Dulles Intl Airport average $289. You can even find prices in April for less than $289, as users have found deals to Region of Ontario from as low as $158. The month of February appears to be one of the more expensive times to travel to Region of Ontario from Washington, D.C. Dulles Intl Airport. Flying in the targeted month can save you up to 11%.

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.

$86+ Flights from Washington, D.C. Dulles Intl Airport to Ontario

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Cheap flight deals from Dulles Intl to Ontario

Round-trip from	$185 (FlightHub)
One-way from	$86 (Mytrip)
Popular in	February
Cheapest in	April
Average price	$265
Good round-trip deal	$219 or less
Good one-way deal	$106 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. 2% potential increase in price ($5 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 June 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 June 12, 2025.

Fri 7/1111:35 amIAD - YTZ

Nonstop1h 33mPorter Airlines

Sat 7/121:25 pmYTZ - IAD

Nonstop1h 31mPorter Airlines

Deal found 6/12

$186

Tue 7/222:25 pmIAD - YYZ

Nonstop1h 36mAir Canada

Tue 7/298:10 amYYZ - IAD

Nonstop1h 27mAir Canada

Deal found 6/11

$198

Fri 7/254:10 pmIAD - YTZ

Nonstop1h 33mMultiple Airlines

Fri 8/11:25 pmYTZ - IAD

Nonstop1h 31mMultiple Airlines

Deal found 6/10

$200

Tue 8/269:35 amIAD - YTZ

1 stop5h 11mAir Canada

Fri 8/293:25 pmYTZ - IAD

1 stop5h 36mAir Canada

Deal found 6/12

$221

Sat 7/196:00 amIAD - YYZ

1 stop8h 45mDelta

Wed 7/236:04 amYYZ - IAD

1 stop5h 58mDelta

Deal found 6/12

$234

Sat 7/269:43 pmIAD - YYZ

1 stop23h 25mMultiple Airlines

Sat 8/28:10 amYYZ - IAD

Nonstop1h 27mMultiple Airlines

Deal found 6/11

$249

Tue 8/55:12 pmIAD - YYZ

Nonstop1h 53mUnited Airlines

Thu 8/1412:45 pmYYZ - IAD

Nonstop1h 34mUnited Airlines

Deal found 6/10

$253

Fri 10/316:30 pmIAD - YOW

1 stop3h 24mPorter Airlines

Mon 11/39:40 amYOW - IAD

1 stop3h 19mPorter Airlines

Deal found 6/11

$255

Mon 7/214:10 pmIAD - YUL

1 stop6h 05mMultiple Airlines

Thu 7/248:00 amYUL - IAD

1 stop5h 42mMultiple Airlines

Deal found 6/11

$260

Fri 8/294:10 pmIAD - YUL

1 stop4h 00mPorter Airlines

Sun 9/78:55 amYUL - IAD

1 stop6h 11mPorter Airlines

Deal found 6/11

$261

Thu 9/119:45 amIAD - YUL

Nonstop1h 53mAir Canada

Fri 9/197:10 pmYUL - IAD

Nonstop1h 55mAir Canada

Deal found 6/11

$265

Fri 6/207:10 amIAD - YUL

1 stop10h 29mDelta

Wed 6/2512:45 pmYUL - IAD

1 stop10h 29mDelta

Deal found 6/10

$297

Best flights from Dulles Intl to Ontario
Discover carefully curated flight deals from Dulles Intl to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 12, 2025.

Fri 7/114:10 pmIAD - YTZ

Nonstop1h 33mPorter Airlines

Sat 7/191:25 pmYTZ - IAD

Nonstop1h 31mPorter Airlines

Deal found 6/12

$185

Fri 7/254:10 pmIAD - YTZ

Nonstop1h 33mMultiple Airlines

Fri 8/11:25 pmYTZ - IAD

Nonstop1h 31mMultiple Airlines

Deal found 6/10

$198

Tue 7/222:25 pmIAD - YYZ

Nonstop1h 36mAir Canada

Tue 7/298:10 amYYZ - IAD

Nonstop1h 27mAir Canada

Deal found 6/11

$198

Sat 7/196:00 amIAD - YYZ

1 stop8h 45mDelta

Mon 7/216:04 amYYZ - IAD

1 stop5h 58mDelta

Deal found 6/10

$234

Tue 8/55:12 pmIAD - YYZ

Nonstop1h 53mUnited Airlines

Thu 8/1412:45 pmYYZ - IAD

Nonstop1h 34mUnited Airlines

Deal found 6/10

$253

Thu 6/194:20 pmIAD - YTZ

Nonstop1h 33mAir Transat

Wed 6/251:35 pmYTZ - IAD

Nonstop1h 31mAir Transat

Deal found 6/10

$312

Mon 8/116:15 amIAD - YYZ

1 stop5h 29mLufthansa

Mon 8/116:20 pmYYZ - IAD

1 stop3h 04mLufthansa

Deal found 6/11

$321

Tue 6/246:00 amIAD - YYZ

1 stop3h 21mWestJet

Tue 6/2411:39 amYYZ - IAD

1 stop8h 12mWestJet

Deal found 6/10

$352

Tue 8/269:35 amIAD - YTZ

1 stop5h 11mAir Canada

Fri 8/293:25 pmYTZ - IAD

1 stop5h 36mAir Canada

Deal found 6/12

$221

Sat 7/269:43 pmIAD - YYZ

1 stop23h 25mMultiple Airlines

Sat 8/28:10 amYYZ - IAD

Nonstop1h 27mMultiple Airlines

Deal found 6/11

$249

Fri 10/316:30 pmIAD - YOW

1 stop3h 24mPorter Airlines

Mon 11/39:40 amYOW - IAD

1 stop3h 19mPorter Airlines

Deal found 6/11

$255

Mon 7/214:10 pmIAD - YUL

1 stop6h 05mMultiple Airlines

Thu 7/248:00 amYUL - IAD

1 stop5h 42mMultiple Airlines

Deal found 6/11

$260

Last-minute flights from Dulles Intl to Ontario
Discover last-minute flight deals from Dulles Intl to Ontario. Data last updated June 12, 2025 and is based on user searches.

Tue 6/172:25 pmIAD - YUL

1 stop7h 17mAir Canada

Tue 6/247:00 amYUL - IAD

1 stop6h 42mAir Canada

Deal found 6/9

$340

Tue 6/174:20 pmIAD - YOW

1 stop4h 43mPorter Airlines

Tue 6/2410:15 amYOW - IAD

1 stop4h 51mPorter Airlines

Deal found 6/10

$386

Thu 6/194:20 pmIAD - YTZ

Nonstop1h 33mAir Transat

Wed 6/251:35 pmYTZ - IAD

Nonstop1h 31mAir Transat

Deal found 6/10

$312

Thu 6/1912:49 pmIAD - YUL

1 stop11h 05mMultiple Airlines

Wed 7/28:55 amYUL - IAD

1 stop6h 01mMultiple Airlines

Deal found 6/12

$441

Fri 6/205:24 pmIAD - YYZ

1 stop5h 34mDelta

Fri 7/43:31 pmYYZ - IAD

1 stop7h 24mDelta

Deal found 6/10

$234

Fri 6/207:10 amIAD - YUL

1 stop10h 29mDelta

Tue 6/2412:45 pmYUL - IAD

1 stop10h 29mDelta

Deal found 6/10

$297

Fri 6/204:20 pmIAD - YOW

1 stop4h 43mMultiple Airlines

Mon 6/305:55 amYOW - IAD

1 stop9h 11mMultiple Airlines

Deal found 6/10

$444

Sat 6/214:20 pmIAD - YTZ

Nonstop1h 33mPorter Airlines

Sat 7/51:25 pmYTZ - IAD

Nonstop1h 31mPorter Airlines

Deal found 6/10

$205

Sat 6/211:00 pmIAD - YTZ

1 stop5h 36mAir Canada

Wed 6/254:20 pmYTZ - IAD

1 stop4h 44mAir Canada

Deal found 6/11

$264

Sat 6/214:20 pmIAD - YUL

1 stop3h 50mPorter Airlines

Wed 6/2510:45 amYUL - IAD

1 stop4h 21mPorter Airlines

Deal found 6/12

$280

Sat 6/211:00 pmIAD - YTZ

1 stop5h 36mAir Canada

Sat 6/2810:25 amYTZ - IAD

1 stop5h 54mAir Canada

Deal found 6/10

$270

Sun 6/2211:35 amIAD - YTZ

Nonstop1h 33mMultiple Airlines

Sun 8/318:45 amYTZ - IAD

Nonstop1h 31mMultiple Airlines

Deal found 6/11

$197

One-way flights from Dulles Intl to Ontario
Search for one-way flight options from Dulles Intl to Ontario. Find affordable one-way fares based on user searches. Data last updated June 12, 2025.

Thu 6/2611:35 amIAD - YTZ

Nonstop1h 33mPorter Airlines

Deal found 6/11

$86

Wed 7/162:25 pmIAD - YYZ

Nonstop1h 36mAir Canada

Deal found 6/12

$87

Mon 8/1811:35 amIAD - YTZ

Nonstop1h 33mAir Transat

Deal found 6/11

$88

Wed 8/136:00 amIAD - YYZ

1 stop3h 22mDelta

Deal found 6/10

$89

Tue 7/229:35 amIAD - YTZ

1 stop5h 11mAir Canada

Deal found 6/10

$91

Tue 7/224:10 pmIAD - YOW

1 stop3h 28mPorter Airlines

Deal found 6/12

$102

Mon 6/303:40 pmIAD - YYZ

Nonstop1h 39mUnited Airlines

Deal found 6/9

$108

Thu 9/259:45 amIAD - YOW

1 stop4h 06mAir Canada

Deal found 6/10

$123

Fri 7/1811:35 amIAD - YOW

1 stop12h 47mMultiple Airlines

Deal found 6/12

$130

Wed 7/26:00 amIAD - YUL

1 stop5h 39mDelta

Deal found 6/10

$130

Fri 7/45:31 pmIAD - YUL

Nonstop2h 14mUnited Airlines

Deal found 6/10

$132

Sun 10/1210:20 amIAD - YUL

1 stop5h 00mAir Canada

Deal found 6/9

$133

Cheapflights Fare Finder

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

Fly to

Route

Depart

Return

Price

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Fri 7/11

11:35 am-1:08 pm

Nonstop1h 33m

Toronto Island

Sat 7/12

1:25 pm-2:56 pm

Nonstop1h 31m

$186

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Tue 7/22

2:25 pm-4:01 pm

Nonstop1h 36m

Toronto Pearson Intl

Tue 7/29

8:10 am-9:37 am

Nonstop1h 27m

$198

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Fri 7/25

4:10 pm-5:43 pm

Nonstop1h 33m

Toronto Island

Fri 8/1

1:25 pm-2:56 pm

Nonstop1h 31m

$200

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Tue 8/26

9:35 am-2:46 pm

1 stop5h 11m

Toronto Island

Fri 8/29

3:25 pm-9:01 pm

1 stop5h 36m

$221

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Sat 7/19

6:00 am-2:45 pm

1 stop8h 45m

Toronto Pearson Intl

Wed 7/23

6:04 am-12:02 pm

1 stop5h 58m

$234

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Sat 7/26

9:43 pm-9:08 pm

1 stop23h 25m

Toronto Pearson Intl

Sat 8/2

8:10 am-9:37 am

Nonstop1h 27m

$249

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Tue 8/5

5:12 pm-7:05 pm

Nonstop1h 53m

Toronto Pearson Intl

Thu 8/14

12:45 pm-2:19 pm

Nonstop1h 34m

$253

Washington, D.C.Ottawa

IAD - YOW

IADYOW

Washington, D.C. Dulles Intl

Fri 10/31

6:30 pm-9:54 pm

1 stop3h 24m

Ottawa

Mon 11/3

9:40 am-12:59 pm

1 stop3h 19m

$255

Washington, D.C.Montreal

IAD - YUL

IADYUL

Washington, D.C. Dulles Intl

Mon 7/21

4:10 pm-10:15 pm

1 stop6h 05m

Montreal Pierre Elliott Trudeau Intl

Thu 7/24

8:00 am-1:42 pm

1 stop5h 42m

$260

Washington, D.C.Montreal

IAD - YUL

IADYUL

Washington, D.C. Dulles Intl

Fri 8/29

4:10 pm-8:10 pm

1 stop4h 00m

Montreal Pierre Elliott Trudeau Intl

Sun 9/7

8:55 am-3:06 pm

1 stop6h 11m

$261

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 60 results

...

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 $353). 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?

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

The most flights from IAD to CAON are scheduled on a Wednesday (19 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (17 on average).

Rainfall in Ontario 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

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

Peruse reviews from past customers who have flown with Porter Airlines, Delta 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.

Porter Airlines

8.0

Very good

288 reviews

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Fort Lauderdale staff was not helpful at all to try to accommodate my husband and myself to sit together. Also very surprised to get charged USD53 for each of our checked luggage, as when we booked the tickets online, the website indicated that our first checked luggage will be charged CAD50!! Very misleading!!!

Porter Airlines

8.0

Very good

288 reviews

Porter Airlines

8.0

Very good

288 reviews

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Delta

8.0

Very good

7,950 reviews

Porter Airlines

8.0

Very good

288 reviews

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Air Transat

7.8

Good

396 reviews

Porter Airlines

8.0

Very good

288 reviews

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Copa Airlines

7.5

Good

1,451 reviews

Porter Airlines

8.0

Very good

288 reviews

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

United Airlines

7.4

Good

8,790 reviews

Porter Airlines

8.0

Very good

288 reviews

Reviews

1 / 20

4.0

Okay

Mary,Jun 2025

FLL - YYZ

Related info for your journey

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 $86. 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 Sun Country Air (100%), ANA (93%) or Jazz (82%) 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 $1,885 for a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario. The cheapest flight overall is $98 while the most popular route, (Washington, D.C. Dulles Intl - Toronto Pearson Intl) is currently priced at $198.
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 $353). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Dulles Intl to Ontario

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 Vancouver Intl flights

Dulles Intl to Calgary flights

Dulles Intl to Toronto Island flights

Baltimore to Pearson Intl flights

Baltimore to Vancouver Intl flights

Reagan-National to Vancouver Intl flights

Baltimore to Calgary flights

Reagan-National to Calgary flights

Baltimore to Pierre Elliott Trudeau Intl flights

Baltimore to Toronto Island flights

Dulles Intl to Québec City flights

Reagan-National to Toronto Island flights

Dulles Intl to Ottawa flights

Reagan-National to Ottawa flights

Dulles Intl to Halifax flights

Reagan-National to Québec City flights

Reagan-National to Halifax flights

Dulles Intl to Edmonton flights

Dulles Intl to Abbotsford flights

Baltimore to Halifax flights

Baltimore to Québec City flights

Reagan-National to Edmonton flights

Dulles Intl to Winnipeg flights

Baltimore to Edmonton flights

Baltimore to Ottawa flights

Dulles Intl to Hamilton flights

Dulles Intl to Saskatoon flights

Baltimore to Winnipeg flights

Dulles Intl to St. John's flights

Baltimore to Abbotsford flights

Baltimore to Saskatoon flights

Reagan-National to Charlottetown flights

Reagan-National to Saskatoon flights

Dulles Intl to Charlottetown flights

Reagan-National to St. John's flights

Reagan-National to Winnipeg flights

Dulles Intl to Victoria flights

Baltimore to St. John's flights

Dulles Intl to Kamloops flights

Dulles Intl to Deer Lake flights

Dulles Intl to Kelowna flights

Dulles Intl to Sault Ste Marie flights

Reagan-National to Abbotsford flights

Reagan-National to Kelowna flights

Baltimore to Charlottetown flights

Baltimore to Kelowna flights

Complete your trip

Region of Ontario car rentals

Toronto Pearson Intl Airport car rentals

Ottawa Airport car rentals

Toronto Island Airport car rentals

Hamilton Airport car rentals

Toronto Region of Waterloo Intl Airport car rentals

London Airport car rentals

Thunder Bay Airport car rentals

Sault Ste Marie Airport car rentals

Timmins Airport car rentals

Kingston Airport car rentals

North Bay Airport car rentals

Top 5 airlines flying from Dulles Intl to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Porter Airlines	Cheapest$117	Average$334	FlexibilityNo cancel fee	On-time52%
Air Canada	Cheapest$129	Average$412	FlexibilityNo cancel fee	On-time67%
Air Transat	Cheapest$169	Average$329	FlexibilityNo cancel fee	On-time50%
United Airlines	Cheapest$196	Average$458	FlexibilityNo cancel fee	On-time69%
WestJet	Cheapest$278	Average$478	FlexibilityNo cancel fee	On-time60%

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$86+ 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 6/26. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Ontario with Cheapflights

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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 June 12, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Dulles Intl to Ontario

Cheapest flights from Dulles Intl to OntarioExplore 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 June 12, 2025.

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 June 12, 2025.

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Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Ontario that are best for you.

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.

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?

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 June 12, 2025.

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 June 12, 2025.

Rainfall in Ontario by month

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

Temperature in Ontario by month

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

Reviews of airlines servicing Ontario

Peruse reviews from past customers who have flown with Porter Airlines, Delta 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.

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?

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

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

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

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

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

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

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

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Alternative routes for Dulles Intl to Ontario

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Top 5 airlines flying from Dulles Intl to Ontario

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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 June 12, 2025.