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.

In terms of precipitation, rainfall in Region of Ontario ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

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 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

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 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$ 842, our data indicates the cheapest price to be C$ 179. The most popular route (Washington, D.C. Dulles Intl - Toronto Pearson Intl), is priced around C$ 245.

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: Avianca (85%), ANA (82%), Copa Airlines( 81%).

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

Before booking your flight from Washington, D.C. Dulles Intl Airport to Region of Ontario check out the most popular airlines for this route: Porter Airlines, Air Canada or United Airlines.

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.

C$ 123+ Cheap Flights from Washington, D.C. Dulles Intl Airport to Ontario

Cheap flight deals from Dulles Intl to Ontario

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

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 25 October 2026.

Fri 6/1111:20 a.m. -

Nonstop1h 30m

Sun 8/119:10 a.m. -

Nonstop1h 29m

Deal found 22/10C$ 273

Sat 14/1111:20 a.m. -

Nonstop1h 30m

Sun 15/119:10 a.m. -

Nonstop1h 29m

Deal found 22/10C$ 274

Wed 11/119:55 a.m. -

Nonstop1h 27m

Sat 14/116:40 p.m. -

Nonstop1h 30m

Deal found 23/10C$ 274

Fri 6/116:25 p.m. -

Nonstop1h 30m

Sat 7/119:10 a.m. -

Nonstop1h 29m

Deal found 23/10C$ 276

Wed 11/1111:20 a.m. -

Nonstop1h 30m

Sat 21/119:10 a.m. -

Nonstop1h 29m

Deal found 22/10C$ 277

Thu 12/1111:20 a.m. -

Nonstop1h 30m

Sat 14/119:10 a.m. -

Nonstop1h 29m

Deal found 23/10C$ 279

Sat 14/118:23 a.m. -

1 stop5h 40m

Mon 16/117:44 p.m. -

Nonstop1h 42m

Deal found 22/10C$ 279

Sat 14/115:20 p.m. -

Nonstop1h 37m

Mon 16/1112:30 p.m. -

1 stop7h 53m

Deal found 22/10C$ 280

Thu 5/1111:20 a.m. -

Nonstop1h 30m

Sun 8/119:10 a.m. -

Nonstop1h 29m

Deal found 22/10C$ 281

Mon 9/116:25 p.m. -

Nonstop1h 30m

Sat 14/119:10 a.m. -

Nonstop1h 29m

Deal found 23/10C$ 283

Sat 7/115:15 p.m. -

Nonstop1h 46m

Mon 9/1110:00 a.m. -

Nonstop1h 45m

Deal found 21/10C$ 283

Thu 5/1111:20 a.m. -

Nonstop1h 30m

Mon 9/119:10 a.m. -

Nonstop1h 29m

Deal found 22/10C$ 284

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 25 October 2026.

Sat 7/1112:39 p.m. -

Nonstop1h 46m

Tue 10/117:44 p.m. -

Nonstop1h 42m

Deal found 23/10C$ 283

Fri 4/126:25 p.m. -

Nonstop1h 30m

Sun 6/129:10 a.m. -

Nonstop1h 30m

Deal found 20/10C$ 287

Wed 9/1211:20 a.m. -

Nonstop1h 30m

Thu 10/129:10 a.m. -

Nonstop1h 30m

Deal found 24/10C$ 297

Wed 2/126:00 a.m. -

1 stop5h 28m

Wed 9/129:45 a.m. -

1 stop6h 38m

Deal found 20/10C$ 375

Wed 13/112:35 p.m. -

1 stop5h 14m

Fri 15/12:45 p.m. -

Nonstop1h 50m

Deal found 22/10C$ 297

Thu 5/119:55 a.m. -

1 stop11h 41m

Mon 9/114:15 p.m. -

Nonstop1h 29m

Deal found 21/10C$ 304

Sat 20/27:22 a.m. -

1 stop6h 21m

Sun 21/27:44 p.m. -

Nonstop1h 45m

Deal found 22/10C$ 297

Wed 11/1110:15 a.m. -

1 stop6h 32m

Wed 18/112:45 p.m. -

Nonstop1h 39m

Deal found 22/10C$ 297

Fri 25/1211:20 a.m. -

Nonstop1h 30m

Wed 30/129:10 a.m. -

Nonstop1h 30m

Deal found 25/10C$ 374

Sat 16/111:05 a.m. -

1 stop4h 59m

Sun 31/16:00 a.m. -

1 stop4h 13m

Deal found 21/10C$ 375

Tue 1/1212:35 p.m. -

1 stop4h 35m

Fri 4/126:10 p.m. -

1 stop5h 13m

Deal found 20/10C$ 375

Thu 5/118:37 a.m. -

1 stop5h 06m

Tue 10/117:26 p.m. -

1 stop5h 04m

Deal found 22/10C$ 318

Sat 5/1211:20 a.m. -

Nonstop1h 30m

Sat 12/129:10 a.m. -

Nonstop1h 30m

Deal found 21/10C$ 388

Wed 4/116:05 a.m. -

1 stop5h 14m

Thu 5/116:10 p.m. -

1 stop5h 06m

Deal found 21/10C$ 375

Tue 24/115:20 p.m. -

Nonstop1h 37m

Wed 25/1110:20 a.m. -

1 stop5h 33m

Deal found 22/10C$ 413

Fri 27/118:27 a.m. -

1 stop5h 16m

Wed 2/126:45 a.m. -

1 stop5h 08m

Deal found 22/10C$ 318

Wed 9/1210:10 a.m. -

1 stop6h 32m

Thu 10/1210:20 a.m. -

1 stop5h 33m

Deal found 22/10C$ 423

Fri 6/1110:15 a.m. -

1 stop6h 32m

Tue 10/118:35 a.m. -

1 stop8h 49m

Deal found 23/10C$ 318

Thu 12/111:15 p.m. -

1 stop8h 00m

Sun 15/116:45 a.m. -

1 stop6h 50m

Deal found 22/10C$ 318

Fri 27/115:20 p.m. -

Nonstop1h 37m

Mon 30/118:55 p.m. -

1 stop14h 53m

Deal found 22/10C$ 444

Thu 26/115:20 p.m. -

Nonstop1h 37m

Mon 30/118:55 p.m. -

1 stop14h 53m

Deal found 22/10C$ 444

Sat 12/1210:10 a.m. -

1 stop6h 32m

Mon 14/128:20 a.m. -

1 stop7h 33m

Deal found 22/10C$ 458

Tue 1/125:20 p.m. -

Nonstop1h 37m

Sat 5/124:00 p.m. -

1 stop5h 00m

Deal found 22/10C$ 394

Sat 21/115:37 p.m. -

Nonstop1h 50m

Mon 23/112:00 p.m. -

Nonstop1h 53m

Deal found 22/10C$ 455

Mon 7/125:37 p.m. -

Nonstop1h 50m

Wed 9/122:00 p.m. -

Nonstop1h 53m

Deal found 22/10C$ 455

Mon 16/1110:35 p.m. -

1 stop14h 36m

Thu 19/112:00 p.m. -

Nonstop1h 53m

Deal found 21/10C$ 468

Thu 26/111:15 p.m. -

1 stop8h 01m

Mon 30/112:00 p.m. -

Nonstop1h 53m

Deal found 23/10C$ 469

Thu 26/116:10 a.m. -

1 stop7h 01m

Sat 28/119:45 a.m. -

Nonstop2h 03m

Deal found 23/10C$ 469

Fri 18/121:17 p.m. -

Nonstop1h 50m

Sat 9/16:00 a.m. -

1 stop13h 52m

Deal found 22/10C$ 476

Thu 24/121:17 p.m. -

Nonstop1h 50m

Sun 3/14:42 p.m. -

1 stop7h 56m

Deal found 22/10C$ 476

Find flight deals from Dulles Intl to Ontario

Round-trip from	C$ 273
One-way from	C$ 123
Popular in	May
Cheapest in	January
Average price	C$ 406
Good round-trip deal	C$ 385 or less
Good one-way deal	C$ 167 or less

Porter Airlines
6/11-8/11
Nonstop
2h 59m total
Washington, D.C. to Ontario

Search Deals

Air Canada
8/11-31/12
1 total stop
4h 32m total
Washington, D.C. to Ontario

Search Deals

Highest demand for flights based on searches. 2% potential increase in price (C$ 13 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 October 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

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

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YYZ Toronto Pearson Intl

IADYYZ

Washington, D.C. Dulles Intl

Mon 11/1

5:18 p.m.-7:01 p.m.

Nonstop1h 43m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 125

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YYZ Toronto Pearson Intl

IADYYZ

Washington, D.C. Dulles Intl

Tue 17/11

12:35 p.m.-5:14 p.m.

1 stop4h 39m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 125

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YYZ Toronto Pearson Intl

IADYYZ

Washington, D.C. Dulles Intl

Sat 9/1

8:15 a.m.-2:03 p.m.

1 stop5h 48m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 125

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YYZ Toronto Pearson Intl

IADYYZ

Washington, D.C. Dulles Intl

Mon 7/12

10:10 p.m.-11:52 p.m.

Nonstop1h 42m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 125

Quickest round-trip

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YTZ Toronto Island

IADYTZ

Washington, D.C. Dulles Intl

Sat 21/11

11:20 a.m.-12:50 p.m.

Nonstop1h 30m

Toronto Island

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 140

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YYZ Toronto Pearson Intl

IADYYZ

Washington, D.C. Dulles Intl

Fri 6/11

6:32 p.m.-11:29 p.m.

1 stop4h 57m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 140

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YTZ Toronto Island

IADYTZ

Washington, D.C. Dulles Intl

Wed 25/11

5:20 p.m.-6:57 p.m.

Nonstop1h 37m

Toronto Island

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 143

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YYZ Toronto Pearson Intl

IADYYZ

Washington, D.C. Dulles Intl

Sun 15/11

6:00 a.m.-1:30 p.m.

1 stop7h 30m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 147

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YYZ Toronto Pearson Intl

IADYYZ

Washington, D.C. Dulles Intl

Fri 13/11

6:00 a.m.-1:30 p.m.

1 stop7h 30m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 147

Washington, D.C.Toronto

IAD Washington, D.C. Dulles Intl - YYZ Toronto Pearson Intl

IADYYZ

Washington, D.C. Dulles Intl

Sat 5/12

11:30 a.m.-5:20 p.m.

1 stop5h 50m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-12:00 a.m.

Nonstop0h 00m

C$ 147

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/10

Showing 1-10 of 60 resultsSorted by cheapest first

...

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.

IAD-YTZ

IAD-YYZ

IAD-YOW

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

IAD-CAON

IAD-YTZ

IAD-YYZ

IAD-YOW

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

Currently, December 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$ 437). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in February is currently the most expensive (average of C$ 552). 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?

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Region of Ontario in the afternoon. Doing so could potentially save you 78% on the flight price compared to flying at noon, which is usually more expensive.

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$ 402 and C$ 684 in November.
The cheapest round-trip price found within the last 5 days was C$ 274 on Air Canada (11 Nov-14 Nov).

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 77 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?

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

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

467 reviews

Check prices

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

467 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

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

7.3

Good

10,437 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

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

11,812 reviews

Porter Airlines

8.0

Very good

467 reviews

Check prices

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

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 United Airlines or Porter 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$ 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: Avianca (85%), ANA (82%), Copa Airlines( 81%).
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$ 842, our data indicates the cheapest price to be C$ 179. The most popular route (Washington, D.C. Dulles Intl - Toronto Pearson Intl), is priced around C$ 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, December 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$ 437). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in February is currently the most expensive (average of C$ 552). 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

Reagan-National to Pearson Intl flights

Dulles Intl 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

Baltimore to Pearson Intl flights

Baltimore to Pierre Elliott Trudeau Intl flights

Reagan-National to Toronto Island flights

Dulles Intl to Vancouver Intl flights

Reagan-National to Vancouver Intl flights

Baltimore to Toronto Island flights

Dulles Intl to Québec City flights

Reagan-National to Québec City flights

Reagan-National to Ottawa flights

Baltimore to Vancouver Intl flights

Dulles Intl to Ottawa flights

Dulles Intl to Calgary flights

Reagan-National to Calgary flights

Baltimore to Calgary flights

Baltimore to Québec City flights

Baltimore to Ottawa flights

Dulles Intl to Hamilton flights

Dulles Intl to Abbotsford flights

Dulles Intl to Edmonton flights

Baltimore to Charlottetown flights

Reagan-National to Victoria flights

Reagan-National to Winnipeg flights

Reagan-National to Edmonton flights

Baltimore to Edmonton flights

Dulles Intl to Winnipeg flights

Baltimore to Winnipeg flights

Dulles Intl to Victoria flights

Baltimore to Halifax flights

Dulles Intl to Halifax flights

Dulles Intl to Kelowna flights

Dulles Intl to Regina flights

Reagan-National to Regina flights

Dulles Intl to Charlottetown flights

Baltimore to Saskatoon flights

Baltimore to Victoria flights

Dulles Intl to Sault Ste Marie flights

Top 3 airlines flying from Dulles Intl to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Porter Airlines	CheapestC$ 286	AverageC$ 425	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
United Airlines	CheapestC$ 301	AverageC$ 516	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	CheapestC$ 391	AverageC$ 659	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Fly with Cheapflights

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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Cheap flights from Washington, D.C. Dulles Intl Airport to Ontario from C$ 123

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap 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 25 October 2026.

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 25 October 2026.

Best flights from Dulles Intl to OntarioDiscover 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 25 October 2026.

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 25 October 2026.

Direct flights from Dulles Intl to OntarioExplore direct flight options from Dulles Intl to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 October 2026.

Explore direct flight options from Dulles Intl to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 October 2026.

Last-minute flights from Dulles Intl to OntarioDiscover last-minute flight deals from Dulles Intl to Ontario. Data last updated 25 October 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Ontario. Data last updated 25 October 2026 and is based on user searches.

One-way flights from Dulles Intl to OntarioSearch for one-way flight options from Dulles Intl to Ontario. Find affordable one-way fares based on user searches. Data last updated 25 October 2026.

Search for one-way flight options from Dulles Intl to Ontario. Find affordable one-way fares based on user searches. Data last updated 25 October 2026.

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Best time to book a flight from Dulles Intl to Ontario

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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 25 October 2026.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Region of Ontario in the afternoon. Doing so could potentially save you 78% on the flight price compared to flying at noon, which is usually more expensive.

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$ 402 and C$ 684 in November.The cheapest round-trip price found within the last 5 days was C$ 274 on Air Canada (11 Nov-14 Nov).

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 77 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 24 October 2026.

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

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

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Dulles Intl and Ontario flights

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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 25 October 2026.

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 25 October 2026.

Direct flights from Dulles Intl to Ontario
Explore direct flight options from Dulles Intl to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 25 October 2026.

Last-minute flights from Dulles Intl to Ontario
Discover last-minute flight deals from Dulles Intl to Ontario. Data last updated 25 October 2026 and is based on user searches.

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 25 October 2026.

Washington, D.C. Dulles Intl Airport to Region of Ontario flights typically cost between C$ 402 and C$ 684 in November.
The cheapest round-trip price found within the last 5 days was C$ 274 on Air Canada (11 Nov-14 Nov).