HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$147+ Cheap flights from Dulles Intl (IAD) to Ontario (ONT)

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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ONT
Nov 25 — Dec 21
Mon 11/25
Mon 12/2
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Dulles Intl to Ontario with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Washington, D.C. Dulles Intl to Ontario are usually found in January or February, booked 13 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Cheap flight deals from Dulles Intl to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 20, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Popular in

March

Cheapest in

January

Round-trip from

$310
(American Airlines)

One-way from

$147
(American Airlines)
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Ontario flights.
Search Deals
High demand for flights, 25% potential price rise
Search Deals
Best time to find cheap flights, 37% potential price drop
Search Deals
From Washington, D.C. Dulles Intl to Ontario
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Ontario
Search Deals

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 November 20, 2024.

This United Airlines deal was found by Cheapflights users on 11/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/94:10 pmIAD - ONT
1 stop10h 48mUnited Airlines
Wed 12/111:40 pmONT - IAD
1 stop6h 42mUnited Airlines
Deal found 11/18$336
This Delta deal was found by Cheapflights users on 11/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/111:35 pmIAD - ONT
2 stops12h 27mDelta
Tue 1/71:21 pmONT - IAD
1 stop7h 15mDelta
Deal found 11/20$341
This American Airlines deal was found by Cheapflights users on 11/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/95:01 pmIAD - ONT
1 stop8h 12mAmerican Airlines
Wed 12/1110:42 amONT - IAD
1 stop8h 42mAmerican Airlines
Deal found 11/18$366
This Alaska Airlines deal was found by Cheapflights users on 11/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/95:32 pmIAD - ONT
2 stops22h 26mAlaska Airlines
Wed 12/116:00 amONT - IAD
2 stops31h 32mAlaska Airlines
Deal found 11/18$407
This Southwest deal was found by Cheapflights users on 11/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/95:45 pmIAD - ONT
1 stop7h 25mSouthwest
Wed 12/119:25 amONT - IAD
2 stops10h 35mSouthwest
Deal found 11/18$439

Find flights from Dulles Intl to Ontario within your budget

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 2,629,791 searches. Data last updated November 20, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 2/18

1:48 pm-9:02 pm

1 stop10h 14m

Ontario

Tue 2/25

10:50 pm-11:54 pm

1 stop22h 04m

$310

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 2/3

6:57 pm-10:49 am

1 stop18h 52m

Ontario

Thu 2/6

6:00 am-5:57 pm

1 stop8h 57m

$336

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Wed 12/11

1:35 pm-11:02 pm

2 stops12h 27m

Ontario

Tue 1/7

1:21 pm-11:36 pm

1 stop7h 15m

$341

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 1/13

2:42 pm-8:29 pm

1 stop8h 47m

Ontario

Tue 1/14

6:00 am-4:15 pm

1 stop7h 15m

$362

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 1/10

11:10 am-8:45 pm

2 stops12h 35m

Ontario

Sun 1/12

5:25 am-2:40 pm

1 stop6h 15m

$401

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 2/25

6:30 am-9:02 pm

1 stop17h 32m

$147

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 11/26

7:00 am-12:11 pm

1 stop8h 11m

$168

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Fri 2/21

6:48 pm-11:02 am

1 stop19h 14m

$174

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 3/4

2:20 pm-8:40 pm

1 stop9h 20m

$188

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sun 12/15

6:45 am-2:00 pm

1 stop10h 15m

$213

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/20

Compare providers for flights from Dulles Intl to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Ontario in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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.

Travel insights for flights from Dulles Intl to Ontario

Get recent, data-driven insights about flights from Dulles Intl to Ontario including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Ontario. Price data was last updated on November 15, 2024.

The best time to book flights from Washington, D.C. Dulles Intl Airport to Ontario is 13 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Ontario (average of $236). Flying from Washington, D.C. Dulles Intl Airport to Ontario in December is currently the most expensive (average of $298). 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 ONT?

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 November 20, 2024.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Ontario in the evening. Doing so could potentially save you 30% on the flight price compared to flying at noon, which is usually more expensive.

Rainfall in Ontario by month

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

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

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

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

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 November 20, 2024.
Read reviews from past customers who have flown Alaska Airlines, American Airlines and Delta from Washington, D.C. to Ontario. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
5,014 reviews

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Southwest
8.1
Very good
5,014 reviews
Southwest
8.1
Very good
5,014 reviews

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Alaska Airlines
8.0
Very good
9,461 reviews
Southwest
8.1
Very good
5,014 reviews

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

Delta
8.0
Very good
8,756 reviews
Southwest
8.1
Very good
5,014 reviews

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

United Airlines
7.4
Good
9,171 reviews
Southwest
8.1
Very good
5,014 reviews

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
5,014 reviews

Boarding

8.2

Comfort

8.1

Crew

8.7

Overall

8.1

Entertainment

7.7

Food

7.2

Reviews

1 / 10

No issues. I needed pre boarding and I was able to get it without issue

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 airport do you fly into for flights to Ontario from Washington, D.C. Dulles Intl?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. Dulles Intl to Ontario. 4 airlines have flights to Ontario from Washington, D.C. Dulles Intl on a regular basis. Booking flights from Washington, D.C. Dulles Intl to Ontario should not be difficult; the airport handles an average of 0 inbound flights from Washington, D.C. Dulles Intl per day.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Ontario round-trip?

    Our cheapest airline available from Washington, D.C. Dulles Intl Airport to Ontario is American Airlines. Our recent data shows that you can find tickets from as low as $310 on this airline. Additional options worth looking into are Alaska Airlines and Delta, starting at $336 and $341 round-trip. American Airlines is priced at 27% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Ontario one-way?

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $147. However, be on the lookout for offers from Delta and Alaska Airlines, as they are both options that can get you from Washington, D.C. Dulles Intl Airport to Ontario for a low price.

  • 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 Ontario?

    Currently, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Ontario (average of $236). Flying from Washington, D.C. Dulles Intl Airport to Ontario in December is currently the most expensive (average of $298). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 Los Angeles flights
Baltimore to Las Vegas flights
Dulles Intl to Los Angeles flights
Dulles Intl to Las Vegas flights
Baltimore to Los Angeles flights
Reagan-National to Las Vegas flights
Reagan-National to San Francisco flights
Dulles Intl to San Francisco flights
Baltimore to San Francisco flights
Dulles Intl to San Diego flights
Baltimore to Burbank flights
Baltimore to San Diego flights
Reagan-National to San Diego flights
Baltimore to Ontario flights
Reagan-National to Ontario flights
Baltimore to Oakland flights
Baltimore to Santa Ana flights
Baltimore to San Jose flights
Dulles Intl to Sacramento flights
Dulles Intl to Palm Springs flights
Dulles Intl to San Jose flights
Reagan-National to Palm Springs flights
Reagan-National to San Jose flights
Baltimore to Sacramento flights
Baltimore to Palm Springs flights
Reagan-National to Sacramento flights
Reagan-National to Santa Ana flights
Dulles Intl to Reno flights
Dulles Intl to Santa Ana flights
Reagan-National to Reno flights
Dulles Intl to Oakland flights
Baltimore to Reno flights
Dulles Intl to Fresno flights
Reagan-National to Oakland flights
Baltimore to Fresno flights
Reagan-National to Burbank flights
Dulles Intl to Burbank flights
Reagan-National to Fresno flights
Dulles Intl to Long Beach flights
Baltimore to Long Beach flights
Dulles Intl to Santa Barbara flights
Dulles Intl to Bakersfield flights
Reagan-National to Bakersfield flights
Baltimore to Santa Barbara flights
Baltimore to Bakersfield flights
Reagan-National to Santa Barbara flights
Reagan-National to Long Beach flights
Baltimore to Monterey flights
Dulles Intl to Monterey flights

Top 4 airlines flying from Dulles Intl to Ontario

Discover the top 4 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 2,629,791 searches. Data last updated November 20, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$219Average$483FlexibilityNo cancel feeOn-time71%
DeltaCheapest$256Average$387FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$312Average$489FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$327Average$448FlexibilityNo cancel feeOn-time63%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines