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Cheap flights from Washington, D.C. Dulles Intl Airport to Ontario from C$ 144

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 22/2. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — YYZ
27 Nov — 4 Dec1
1 adult
1 adult, Economy, 0 bags

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 28 October 2025.

Round-trip from

C$ 292

One-way from

C$ 145

Popular in

October

Cheapest in

June

Average price

C$ 446

Good round-trip deal

C$ 178 or less

Good one-way deal

C$ 153 or less
Porter Airlines
  • Porter Airlines
  • 21/11-23/11
  • Nonstop
  • 2h 59m total
  • Washington, D.C. to Ontario
Search Deals
Porter Airlines
  • Porter Airlines
  • 23/11
  • Nonstop
  • 1h 30m total
  • Washington, D.C. to Ontario
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (C$ 24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Ontario.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Ontario.
Search Deals

Find flight deals from Dulles Intl to Ontario

Enter your travel dates to find the best prices.

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 28 October 2025.

Thu 20/1111:40 a.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Sun 23/118:55 a.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 27/10C$ 294
Fri 21/116:30 p.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Tue 25/113:45 p.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 26/10C$ 295
Tue 2/126:30 p.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Fri 12/123:45 p.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 27/10C$ 297
Sat 22/111:45 p.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Mon 24/113:45 p.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 26/10C$ 298
Mon 17/1111:40 a.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Wed 19/118:55 a.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 27/10C$ 299
Thu 27/1111:40 a.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Sat 6/1211:00 a.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 27/10C$ 301
Tue 2/126:30 p.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Sat 6/1211:00 a.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 27/10C$ 305
Thu 20/119:45 a.m.IAD - YTZ
1 stop7h 10mAir Canada
Sun 23/113:30 p.m.YTZ - IAD
1 stop5h 24mAir Canada
Deal found 27/10C$ 308
Fri 28/116:30 p.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Sat 6/1211:00 a.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 27/10C$ 310
Sat 22/111:45 p.m.IAD - YTZ
Nonstop1h 30mPorter Airlines
Thu 27/113:45 p.m.YTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 28/10C$ 312
Thu 20/119:45 a.m.IAD - YYZ
1 stop5h 49mAir Canada
Sun 23/112:00 p.m.YYZ - IAD
1 stop6h 54mAir Canada
Deal found 27/10C$ 329
Sat 29/119:45 a.m.IAD - YYZ
1 stop4h 55mAir Canada
Sat 6/126:55 p.m.YYZ - IAD
Nonstop1h 31mAir Canada
Deal found 27/10C$ 333

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 629,999 searches. Data last updated 28 October 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

Fri 21/11

6:30 p.m.-8:00 p.m.

Nonstop1h 30m

Toronto Island

Fri 28/11

3:45 p.m.-5:14 p.m.

Nonstop1h 29m

C$ 294

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Tue 2/12

6:30 p.m.-8:00 p.m.

Nonstop1h 30m

Toronto Island

Fri 12/12

3:45 p.m.-5:14 p.m.

Nonstop1h 29m

C$ 297

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Wed 3/12

6:30 p.m.-8:00 p.m.

Nonstop1h 30m

Toronto Island

Fri 5/12

3:45 p.m.-5:14 p.m.

Nonstop1h 29m

C$ 298

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Thu 22/1

11:40 a.m.-1:10 p.m.

Nonstop1h 30m

Toronto Island

Sun 25/1

8:55 a.m.-10:24 a.m.

Nonstop1h 29m

C$ 299

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Thu 27/11

11:40 a.m.-1:10 p.m.

Nonstop1h 30m

Toronto Island

Mon 8/12

8:55 a.m.-10:24 a.m.

Nonstop1h 29m

C$ 301

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Thu 20/11

11:40 a.m.-1:10 p.m.

Nonstop1h 30m

Toronto Island

Sun 23/11

8:55 a.m.-10:24 a.m.

Nonstop1h 29m

C$ 304

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Tue 2/12

6:30 p.m.-8:00 p.m.

Nonstop1h 30m

Toronto Island

Sun 7/12

8:55 a.m.-10:24 a.m.

Nonstop1h 29m

C$ 305

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Fri 5/12

6:30 p.m.-8:00 p.m.

Nonstop1h 30m

Toronto Island

Tue 9/12

3:45 p.m.-5:14 p.m.

Nonstop1h 29m

C$ 315

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Sat 6/12

1:45 p.m.-3:15 p.m.

Nonstop1h 30m

Toronto Island

Tue 9/12

3:45 p.m.-5:14 p.m.

Nonstop1h 29m

C$ 315

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Sun 16/11

11:40 a.m.-1:10 p.m.

Nonstop1h 30m

Toronto Island

Thu 20/11

8:55 a.m.-10:24 a.m.

Nonstop1h 29m

C$ 322

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/10

Showing 1-10 of 60 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, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario (average of C$ 127). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in August is currently the most expensive (average of C$ 239). 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 28 October 2025.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Region of Ontario at noon. Doing so could potentially save you 34% on the flight price compared to flying in the morning, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Ontario. Price data was last updated on 16 December 2024.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Region of Ontario flight should consider departing on Thursday at noon when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 28 October 2025.
See what other customers who have flown with Porter Airlines,United Airlines, andAir Canada from Washington, D.C. Dulles Intl Airport to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Overall

8.0

Food

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
8.0
Very good
384 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Overall

8.0

Food

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,996 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Overall

8.0

Food

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,370 reviews
Porter Airlines
8.0
Very good
384 reviews
Check prices

Boarding

8.2

Comfort

8.0

Crew

8.6

Entertainment

7.0

Overall

8.0

Food

7.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

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.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Region of Ontario?

    There are many flights that can get you from Washington, D.C. Dulles Intl Airport to Region of Ontario in 1h 30m. Fly via Porter Airlines or United Airlines to get the fastest option. The distance between Washington, D.C. Dulles Intl Airport and Region of Ontario is about 546 km. Most flights are nonstop.

  • 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 C$ 144. However, be on the lookout for offers from Air Transat and United Airlines, 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?

    When deciding which route to take from Washington, D.C. Dulles Intl Airport to Region of Ontario consider Washington, D.C. Dulles Intl - Montreal Pierre Elliott Trudeau Intl, Washington, D.C. Dulles Intl - Toronto Pearson Intl or Washington, D.C. Dulles Intl - Toronto Island as they are the most popular.

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

    Before booking your flight to Region of Ontario from Washington, D.C. Dulles Intl Airport, check out the most reliable airlines to get you to your destination on time: Republic Airways (93%), United Airlines (93%), Air Canada( 92%).

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

    Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to Region of Ontario? While on average our users pay C$ 307, our data indicates the cheapest price to be C$ 151. The most popular route (Washington, D.C. Dulles Intl - Montreal Pierre Elliott Trudeau Intl), is priced around C$ 323.

  • 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, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario (average of C$ 127). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in August is currently the most expensive (average of C$ 239). 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.
Reagan-National to Pearson Intl flights
Dulles Intl to Pierre Elliott Trudeau Intl flights
Dulles Intl to Pearson Intl flights
Reagan-National to Pierre Elliott Trudeau Intl flights
Dulles Intl to Toronto Island flights
Dulles Intl to Vancouver Intl flights
Baltimore to Pearson Intl flights
Baltimore to Vancouver Intl flights
Baltimore to Pierre Elliott Trudeau Intl flights
Reagan-National to Vancouver Intl flights
Dulles Intl to Calgary flights
Reagan-National to Calgary flights
Dulles Intl to Québec City flights
Baltimore to Calgary flights
Dulles Intl to Ottawa flights
Baltimore to Toronto Island flights
Reagan-National to Québec City flights
Dulles Intl to Halifax flights
Baltimore to Québec City flights
Baltimore to Halifax flights
Dulles Intl to Abbotsford flights
Reagan-National to Ottawa flights
Baltimore to Ottawa flights
Dulles Intl to Winnipeg flights
Baltimore to Winnipeg flights
Dulles Intl to Edmonton flights
Baltimore to Edmonton flights
Reagan-National to Toronto Island flights
Reagan-National to Edmonton flights
Reagan-National to Winnipeg flights
Dulles Intl to Kelowna flights
Dulles Intl to Victoria flights
Baltimore to Victoria flights
Reagan-National to Victoria flights
Baltimore to Saskatoon flights
Dulles Intl to Sault Ste Marie flights
Dulles Intl to Hamilton flights
Dulles Intl to London flights
Dulles Intl to Thunder Bay flights

Top 3 airlines flying from Dulles Intl to Ontario

Discover the top 3 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 629,999 searches. Data last updated 28 October 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 179AverageC$ 447FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 185AverageC$ 491FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Porter AirlinesCheapestC$ 247AverageC$ 453FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Dulles Intl to Ontario?

Cheapflights makes it easy to find Dulles Intl to Ontario flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Ontario?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Dulles Intl to Ontario for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Dulles Intl to Ontario with no change fees?

Yes, we can. To see specific flights from Dulles Intl to Ontario with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Dulles Intl to Ontario become cheaper?

Not ready to book yet? You can track prices for flights from Dulles Intl to Ontario on Cheapflights with our Price Alert feature and get notified when better prices are available.

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