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Cheap flights from Washington, D.C. Dulles Intl Airport to Ontario from C$ 155

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 18/8. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — YYZ
23 Aug — 30 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap 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 24 July 2026.

Thu 13/83:50 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Sat 15/89:15 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Deal found 20/7C$ 305
Sat 15/83:50 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Tue 18/89:15 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Deal found 19/7C$ 310
Sat 15/811:25 a.m.
IAD
-
YTZ
Nonstop1h 30m
Multiple Airlines
Wed 19/89:15 a.m.
YTZ
-
IAD
Nonstop1h 30m
Multiple Airlines
Deal found 22/7C$ 311
Wed 19/811:25 a.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Sat 29/89:15 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Deal found 23/7C$ 314
Thu 3/911:25 a.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Sat 5/99:15 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Deal found 23/7C$ 315
Thu 27/811:25 a.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Sun 30/89:15 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Deal found 20/7C$ 317
Mon 10/83:50 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Thu 13/81:40 p.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Deal found 20/7C$ 318
Sat 8/83:50 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Mon 17/81:40 p.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Deal found 23/7C$ 320
Tue 11/83:50 p.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Sat 15/89:15 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Deal found 20/7C$ 321
Tue 25/89:55 a.m.
IAD
-
YYZ
Nonstop1h 26m
Air Canada
Tue 25/82:00 p.m.
YYZ
-
IAD
1 stop5h 01m
Air Canada
Deal found 23/7C$ 322
Wed 19/811:25 a.m.
IAD
-
YTZ
Nonstop1h 30m
Porter Airlines
Thu 27/89:15 a.m.
YTZ
-
IAD
Nonstop1h 30m
Porter Airlines
Deal found 20/7C$ 324
Mon 14/99:55 a.m.
IAD
-
YYZ
Nonstop1h 25m
Air Canada
Fri 18/91:55 p.m.
YYZ
-
IAD
Nonstop1h 30m
Air Canada
Deal found 19/7C$ 342

Find 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 24 July 2026.

Round-trip from

C$ 305

One-way from

C$ 155

Popular in

May

Cheapest in

January

Average price

C$ 434

Good round-trip deal

C$ 153 or less

Good one-way deal

C$ 181 or less
Porter Airlines
  • Porter Airlines
  • 13/8-15/8
  • Nonstop
  • 3h 00m total
  • Washington, D.C. to Ontario
Search Deals
Porter Airlines
  • Porter Airlines
  • 18/8
  • Nonstop
  • 1h 30m total
  • Washington, D.C. to Ontario
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (C$ 12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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

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 24 July 2026.
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

Cheapest round-trip
Quickest round-trip

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Tue 25/8

3:50 p.m.-5:20 p.m.

Nonstop1h 30m

Toronto Island

Sat 29/8

1:40 p.m.-3:10 p.m.

Nonstop1h 30m

C$ 332

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Tue 18/8

9:45 a.m.-2:21 p.m.

1 stop4h 36m

Toronto Island

Thu 27/8

10:45 a.m.-3:01 p.m.

1 stop4h 16m

C$ 386

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Wed 2/9

11:25 a.m.-12:55 p.m.

Nonstop1h 30m

Toronto Island

Sat 5/9

1:40 p.m.-3:10 p.m.

Nonstop1h 30m

C$ 393

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Thu 20/8

3:50 p.m.-5:20 p.m.

Nonstop1h 30m

Toronto Island

Fri 21/8

9:15 a.m.-10:45 a.m.

Nonstop1h 30m

C$ 393

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Sun 23/8

3:50 p.m.-5:20 p.m.

Nonstop1h 30m

Toronto Island

Mon 24/8

9:15 a.m.-10:45 a.m.

Nonstop1h 30m

C$ 393

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Tue 1/9

9:45 a.m.-2:21 p.m.

1 stop4h 36m

Toronto Island

Wed 2/9

10:45 a.m.-2:55 p.m.

1 stop4h 10m

C$ 417

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Sat 10/10

10:19 p.m.-11:54 p.m.

Nonstop1h 35m

Toronto Pearson Intl

Tue 13/10

7:43 p.m.-9:24 p.m.

Nonstop1h 41m

C$ 435

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Tue 10/11

12:39 p.m.-2:25 p.m.

Nonstop1h 46m

Toronto Pearson Intl

Tue 17/11

2:15 p.m.-3:45 p.m.

Nonstop1h 30m

C$ 435

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Sat 8/8

10:14 p.m.-11:54 p.m.

Nonstop1h 40m

Toronto Pearson Intl

Wed 12/8

9:44 a.m.-11:21 a.m.

Nonstop1h 37m

C$ 435

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Sun 9/8

5:15 p.m.-7:02 p.m.

Nonstop1h 47m

Toronto Pearson Intl

Wed 12/8

10:30 a.m.-3:01 p.m.

1 stop4h 31m

C$ 441

Flights are sorted by cheapest round-trip flights first.

Deals found on 24/7

Showing 1-10 of 60 resultsSorted by cheapest first
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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, September 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$ 428). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in February is currently the most expensive (average of C$ 555). 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 24 July 2026.

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 36% on the flight price compared to flying in the evening, which is usually more expensive.

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 24 July 2026.

The most flights from IAD to CAON are scheduled on a Wednesday (21 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?

Airfare is below average for this route at the moment.
Washington, D.C. Dulles Intl Airport to Region of Ontario flights typically cost between C$ 439 and C$ 725 in August.
The cheapest round-trip price found within the last 5 days was C$ 322 on Air Canada (25 Aug-25 Aug).

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

The price you pay for your flight from Washington, D.C. Dulles Intl Airport to Region of Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 78 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 21 September 2025.

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. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 24 July 2026.
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
448 reviews
Check prices

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Porter Airlines
8.0
Very good
448 reviews
Porter Airlines
8.0
Very good
448 reviews
Check prices

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
United Airlines
7.4
Good
10,029 reviews
Porter Airlines
8.0
Very good
448 reviews
Check prices

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats
Air Canada
7.1
Good
11,383 reviews
Porter Airlines
8.0
Very good
448 reviews
Check prices

Comfort

8.0

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

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, Air Canada, 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. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • 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$ 113. However, be on the lookout for offers from United Airlines and Air Canada, 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 - Toronto Pearson Intl, Washington, D.C. Dulles Intl - Montreal Pierre Elliott Trudeau 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: United Airlines (80%), ANA (80%), Copa Airlines( 76%).

  • 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$ 335, our data indicates the cheapest price to be C$ 151. The most popular route (Washington, D.C. Dulles Intl - Toronto Pearson Intl), is priced around C$ 336.

  • 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, September 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$ 428). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in February is currently the most expensive (average of C$ 555). 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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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 24 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 179AverageC$ 610FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Porter AirlinesCheapestC$ 287AverageC$ 399FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 303AverageC$ 518FlexibilityNo cancel feeOn-time69%
Search United 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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