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$104+ 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 11/23. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — YYZ
Nov 26 — Dec 31
Wed 11/26
Wed 12/3
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 October 27, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$210
(Kiwi.com)

One-way from

$104
(FlightHub)

Popular in

October

Cheapest in

June

Average price

$319

Good round-trip deal

$231 or less

Good one-way deal

$134 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. 4% potential increase in price ($12 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 October 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 October 27, 2025.

This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/216:30 pmIAD - YTZ
Nonstop1h 30mPorter Airlines
Fri 11/283:45 pmYTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 10/27$210
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/216:30 pmIAD - YTZ
Nonstop1h 30mPorter Airlines
Tue 11/253:45 pmYTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 10/26$211
This Kiwi.com deal was found by Cheapflights users on 10/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/26:30 pmIAD - YTZ
Nonstop1h 30mPorter Airlines
Sat 12/611:00 amYTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 10/25$212
This Trip.com deal was found by Cheapflights users on 10/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/206:30 pmIAD - YTZ
Nonstop1h 30mPorter Airlines
Sun 11/238:55 amYTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 10/26$213
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/176:30 pmIAD - YTZ
Nonstop1h 30mPorter Airlines
Fri 11/218:55 amYTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 10/27$214
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/236:30 pmIAD - YTZ
Nonstop1h 30mPorter Airlines
Fri 11/283:45 pmYTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 10/27$215
This Kiwi.com deal was found by Cheapflights users on 10/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1611:40 amIAD - YTZ
Nonstop1h 30mPorter Airlines
Thu 11/273:45 pmYTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 10/25$217
This FlightHub deal was found by Cheapflights users on 10/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/411:40 amIAD - YTZ
Nonstop1h 30mPorter Airlines
Sun 12/78:55 amYTZ - IAD
Nonstop1h 29mPorter Airlines
Deal found 10/27$218
This Mytrip deal was found by Cheapflights users on 10/25. 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.
Thu 11/209:45 amIAD - YTZ
1 stop7h 10mMultiple Airlines
Sun 11/238:55 amYTZ - IAD
Nonstop1h 29mMultiple Airlines
Deal found 10/25$219
This Flightnetwork deal was found by Cheapflights users on 10/25. 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 11/209:45 amIAD - YTZ
1 stop5h 10mAir Canada
Sun 11/233:30 pmYTZ - IAD
1 stop5h 24mAir Canada
Deal found 10/25$220
This Mytrip deal was found by Cheapflights users on 10/25. 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.
Thu 11/279:45 amIAD - YTZ
1 stop7h 10mMultiple Airlines
Thu 12/43:45 pmYTZ - IAD
Nonstop1h 29mMultiple Airlines
Deal found 10/25$222
This Flightnetwork deal was found by Cheapflights users on 10/25. 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 11/209:45 amIAD - YYZ
1 stop5h 49mAir Canada
Sun 11/232:00 pmYYZ - IAD
1 stop6h 54mAir Canada
Deal found 10/25$227

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 October 27, 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 11/21

6:30 pm-8:00 pm

Nonstop1h 30m

Toronto Island

Fri 11/28

3:45 pm-5:14 pm

Nonstop1h 29m

$210

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Wed 11/19

6:30 pm-8:00 pm

Nonstop1h 30m

Toronto Island

Fri 11/28

3:45 pm-5:14 pm

Nonstop1h 29m

$213

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Thu 11/20

11:40 am-1:10 pm

Nonstop1h 30m

Toronto Island

Sun 11/23

8:55 am-10:24 am

Nonstop1h 29m

$213

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Thu 1/22

11:40 am-1:10 pm

Nonstop1h 30m

Toronto Island

Sun 1/25

8:55 am-10:24 am

Nonstop1h 29m

$214

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Fri 2/6

11:40 am-1:10 pm

Nonstop1h 30m

Toronto Island

Sun 2/8

8:55 am-10:24 am

Nonstop1h 29m

$217

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Sun 11/16

11:40 am-1:10 pm

Nonstop1h 30m

Toronto Island

Thu 11/27

3:45 pm-5:14 pm

Nonstop1h 29m

$217

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Thu 11/27

11:40 am-1:10 pm

Nonstop1h 30m

Toronto Island

Thu 12/4

8:55 am-10:24 am

Nonstop1h 29m

$220

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Tue 12/9

6:30 pm-8:00 pm

Nonstop1h 30m

Toronto Island

Thu 12/11

3:45 pm-5:14 pm

Nonstop1h 29m

$223

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Fri 11/21

6:30 pm-8:00 pm

Nonstop1h 30m

Toronto Island

Mon 11/24

3:45 pm-5:14 pm

Nonstop1h 29m

$223

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Fri 11/21

6:30 pm-8:00 pm

Nonstop1h 30m

Toronto Island

Sun 11/23

8:55 am-10:24 am

Nonstop1h 29m

$223

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

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 $91). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in August is currently the most expensive (average of $171). 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 October 27, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 12% on flights from Washington, D.C. Dulles Intl Airport to Region of Ontario by exploring options for tickets at noon.

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 December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Region of Ontario flight should consider departing on Friday 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.

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 October 27, 2025.

The most flights from IAD to CAON are scheduled on a Monday (16 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (12 on average).

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 October 27, 2025.
Get a feel of what it's like to fly with Porter Airlines, Air Transat, and United Airlines from Washington, D.C. Dulles Intl Airport to Ontario by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
384 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.6

Entertainment

7.0

Boarding

8.2

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

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.6

Entertainment

7.0

Boarding

8.2

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 Transat
7.8
Good
469 reviews
Porter Airlines
8.0
Very good
384 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.6

Entertainment

7.0

Boarding

8.2

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
8,999 reviews
Porter Airlines
8.0
Very good
384 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.6

Entertainment

7.0

Boarding

8.2

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.
WestJet
7.2
Good
3,147 reviews
Porter Airlines
8.0
Very good
384 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.6

Entertainment

7.0

Boarding

8.2

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
10,367 reviews
Porter Airlines
8.0
Very good
384 reviews

Overall

8.0

Comfort

8.0

Crew

8.6

Food

7.6

Entertainment

7.0

Boarding

8.2

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?

    For as low as $210, Porter Airlines can have you in Region of Ontario from Washington, D.C. Dulles Intl Airport in 1h 30m. Airlines will cover a distance of 339 mi. All flights are typically 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 $106. However, be on the lookout for offers from Air Transat 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?

    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 Republic Airways (93%), United Airlines (93%) or Air Canada (92%) 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 $853 for a flight from Washington, D.C. Dulles Intl Airport to Region of Ontario. The cheapest flight overall is $106 while the most popular route, (Washington, D.C. Dulles Intl - Toronto Pearson Intl) is currently priced at $241.

  • 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 $91). Flying from Washington, D.C. Dulles Intl Airport to Region of Ontario in August is currently the most expensive (average of $171). 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.
Dulles Intl to Pierre Elliott Trudeau Intl flights
Reagan-National to Pierre Elliott Trudeau Intl flights
Reagan-National to Pearson Intl flights
Dulles Intl to Pearson Intl flights
Dulles Intl to Vancouver Intl flights
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Baltimore to Pierre Elliott Trudeau Intl flights
Baltimore to Vancouver Intl flights
Reagan-National to Vancouver Intl flights
Baltimore to Pearson Intl flights
Dulles Intl to Québec City flights
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Baltimore to Calgary flights
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Dulles Intl to Abbotsford flights
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Baltimore to Québec City flights
Reagan-National to Abbotsford flights
Baltimore to Toronto Island flights
Baltimore to Ottawa flights
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Baltimore to Yellowknife flights
Dulles Intl to Winnipeg flights
Baltimore to Halifax flights
Dulles Intl to Edmonton flights
Baltimore to Edmonton flights
Reagan-National to Edmonton flights
Reagan-National to Winnipeg flights
Baltimore to Winnipeg flights
Dulles Intl to Saskatoon flights
Baltimore to Kelowna flights
Dulles Intl to Kelowna flights
Reagan-National to Saskatoon flights
Baltimore to Saskatoon flights
Reagan-National to Kelowna flights
Dulles Intl to Victoria flights
Reagan-National to St. John's flights
Dulles Intl to St. John's flights
Reagan-National to Victoria flights
Dulles Intl to Charlottetown flights
Baltimore to Victoria flights
Reagan-National to Charlottetown flights
Dulles Intl to Sault Ste Marie flights
Baltimore to St. John's 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 October 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapest$54Average$318FlexibilityNo cancel feeOn-time52%
Air CanadaCheapest$144Average$413FlexibilityNo cancel feeOn-time67%
Air TransatCheapest$176Average$246FlexibilityNo cancel feeOn-time50%
United AirlinesCheapest$241Average$415FlexibilityNo cancel feeOn-time69%
WestJetCheapest$319Average$636FlexibilityNo cancel feeOn-time60%

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