Ontario

$97+ 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 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ONT
Dec 28 — Jan 41
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 December 23, 2024.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$336
(Delta)

One-way from

$97
(Trip.com)

Popular in

December

Cheapest in

January

Average price

$617
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Ontario flight deals.
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Ontario flights.
From Washington, D.C. Dulles Intl to Ontario
One-way flight from Washington, D.C. Dulles Intl to Ontario
High demand for flights, 2% potential price rise
Best time to find cheap flights, 4% potential price drop
Average for round-trip flights in December 2024

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 December 23, 2024.

This United Airlines deal was found by Cheapflights users on 12/23. 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.
Thu 12/262:40 pmIAD - ONT
1 stop11h 20mUnited Airlines
Wed 1/16:30 pmONT - IAD
1 stop7h 45mUnited Airlines
Deal found 12/23$636
This Delta deal was found by Cheapflights users on 12/22. 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.
Fri 12/276:57 pmIAD - ONT
1 stop7h 44mDelta
Tue 12/311:05 pmONT - IAD
1 stop7h 14mDelta
Deal found 12/22$656
This American Airlines deal was found by Cheapflights users on 12/21. 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 12/305:15 pmIAD - ONT
1 stop8h 13mAmerican Airlines
Tue 12/317:15 amONT - IAD
2 stops9h 19mAmerican Airlines
Deal found 12/21$679
This Southwest deal was found by Cheapflights users on 12/22. 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.
Thu 12/265:20 pmIAD - ONT
1 stop6h 55mSouthwest
Tue 12/319:25 amONT - IAD
2 stops10h 35mSouthwest
Deal found 12/22$741
This Alaska Airlines deal was found by Cheapflights users on 12/22. 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 12/237:00 amIAD - ONT
1 stop13h 09mAlaska Airlines
Wed 1/86:00 amONT - IAD
1 stop8h 57mAlaska Airlines
Deal found 12/22$1,269

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 2,558,603 searches. Data last updated December 23, 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 1/14

4:05 pm-10:32 pm

1 stop9h 27m

Ontario

Sat 1/25

1:21 pm-11:36 pm

1 stop7h 15m

$336

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 1/14

5:00 am-11:58 am

2 stops9h 58m

Ontario

Tue 1/28

10:00 am-10:41 pm

2 stops9h 41m

$346

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 5/6

6:30 am-3:32 pm

1 stop12h 02m

Ontario

Tue 5/13

11:46 am-11:58 pm

1 stop9h 12m

$358

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Mon 1/20

2:42 pm-8:29 pm

1 stop8h 47m

Ontario

Thu 1/23

10:47 am-12:29 am

1 stop10h 42m

$396

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 1/23

11:10 am-9:45 pm

2 stops13h 35m

Ontario

Mon 1/27

10:55 am-11:05 pm

1 stop9h 10m

$424

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sun 2/23

10:25 pm-11:59 pm

2 stops52h 34m

$97

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sat 1/25

4:05 pm-10:32 pm

1 stop9h 27m

$168

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Tue 5/13

6:30 am-3:32 pm

1 stop12h 02m

$184

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Thu 1/30

2:42 pm-8:29 pm

1 stop8h 47m

$198

Washington, D.C.Ontario

IAD - ONT

IADONT

Washington, D.C. Dulles Intl

Sun 2/23

2:15 pm-10:50 pm

1 stop11h 35m

$204

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

Showing 1-10 of 11 results
1
2

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 December.
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 December 20, 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, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Ontario (average of $246). Flying from Washington, D.C. Dulles Intl Airport to Ontario in March is currently the most expensive (average of $317). 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 December 23, 2024.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Ontario in the morning. 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 December 23, 2024.
Read reviews from past customers who have flown Delta, American Airlines and Alaska Airlines 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.
8.1
Very good
4,780 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 10

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

8.1
Very good
4,780 reviews
8.1
Very good
4,780 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 10

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

8.0
Very good
9,549 reviews
8.1
Very good
4,780 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 10

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

8.0
Very good
8,588 reviews
8.1
Very good
4,780 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 10

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

7.4
Good
9,020 reviews
8.1
Very good
4,780 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Entertainment

7.7

Crew

8.7

Reviews

1 / 10

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

7.2
Good
10,000 reviews
8.1
Very good
4,780 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Overall

8.1

Entertainment

7.7

Crew

8.7

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 Delta. Our recent data shows that you can find tickets from as low as $336 on this airline. Additional options worth looking into are American Airlines and Alaska Airlines, starting at $346 and $358 round-trip. Delta is priced at 21% 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 Frontier, with whom users have recently found tickets for as low as $97. However, be on the lookout for offers from United Airlines and Delta, 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, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Ontario (average of $246). Flying from Washington, D.C. Dulles Intl Airport to Ontario in March is currently the most expensive (average of $317). 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.

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 2,558,603 searches. Data last updated December 23, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$219Average$474FlexibilityNo cancel feeOn-time71%
DeltaCheapest$256Average$393FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$314Average$510FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$327Average$534FlexibilityNo 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.