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Washington, D.C.

$64+ Cheap flights from Ontario (ONT) to Washington, D.C. (WAS)

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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — WAS
Jan 21 — Jan 281
Tue 1/21
Tue 1/28
1 adult, Economy
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1. Tell us where you want to go
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The best prices from Ontario to Washington, D.C. are usually found in April or August, booked 61 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap flight deals from Ontario to Washington, D.C.

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Washington, D.C. (WAS). 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 January 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$130
(Frontier)

One-way from

$64
(Trip.com)

Popular in

June

Cheapest in

April

Average price

$386
Provider with most accurate pricing for Ontario-Washington, D.C. (WAS) flight deals.
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Provider most trusted by Cheapflights users for Ontario-Washington, D.C. (WAS) flights.
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From Ontario to Washington, D.C. (WAS)
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One-way flight from Ontario to Washington, D.C. (WAS)
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High demand for flights, 4% potential price rise
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Best time to find cheap flights, 1% potential price drop
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Average for round-trip flights in January 2025
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Find flight deals from Ontario to Washington, D.C.

Cheapest flights from Ontario to Washington, D.C.
Explore the most affordable flight options available from Ontario to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 16, 2025.

This Frontier deal was found by Cheapflights users on 1/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/27:58 pmONT - BWI
1 stop12h 07mFrontier
Wed 4/98:49 pmBWI - ONT
1 stop13h 40mFrontier
Deal found 1/16$130
This Frontier deal was found by Cheapflights users on 1/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1312:59 amONT - DCA
1 stop8h 04mFrontier
Sat 2/221:03 pmDCA - ONT
1 stop14h 06mFrontier
Deal found 1/16$236
This Travelocity deal was found by Cheapflights users on 1/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/197:00 amONT - DCA
2 stops11h 59mMultiple Airlines
Tue 2/256:00 pmDCA - ONT
1 stop8h 59mMultiple Airlines
Deal found 1/16$307
This Alaska Airlines deal was found by Cheapflights users on 1/16. 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.
Sat 2/16:00 amONT - IAD
1 stop8h 57mAlaska Airlines
Tue 2/46:57 pmIAD - ONT
1 stop18h 41mAlaska Airlines
Deal found 1/16$326
This Delta deal was found by Cheapflights users on 1/15. 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 1/291:21 pmONT - BWI
1 stop7h 13mDelta
Fri 1/317:15 amBWI - ONT
1 stop8h 11mDelta
Deal found 1/15$327
This Delta deal was found by Cheapflights users on 1/16. 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.
Sun 2/166:00 amONT - DCA
1 stop7h 00mDelta
Sat 2/225:10 pmDCA - ONT
1 stop9h 16mDelta
Deal found 1/16$327
This Delta deal was found by Cheapflights users on 1/15. 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.
Thu 2/131:21 pmONT - IAD
1 stop7h 13mDelta
Mon 2/244:53 pmIAD - ONT
1 stop8h 59mDelta
Deal found 1/15$327
This American Airlines deal was found by Cheapflights users on 1/14. 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.
Tue 2/1810:50 pmONT - DCA
1 stop6h 42mAmerican Airlines
Fri 2/215:05 pmDCA - ONT
1 stop7h 59mAmerican Airlines
Deal found 1/14$334
This American Airlines deal was found by Cheapflights users on 1/16. 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.
Sun 2/27:30 pmONT - BWI
2 stops10h 15mAmerican Airlines
Tue 2/48:23 amBWI - ONT
2 stops13h 14mAmerican Airlines
Deal found 1/16$337
This American Airlines deal was found by Cheapflights users on 1/16. 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.
Sun 2/2310:50 pmONT - IAD
1 stop6h 52mAmerican Airlines
Wed 2/265:13 pmIAD - ONT
1 stop8h 03mAmerican Airlines
Deal found 1/16$362
This Alaska Airlines deal was found by Cheapflights users on 1/15. 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.
Wed 1/296:00 amONT - BWI
1 stop8h 59mAlaska Airlines
Wed 2/56:59 pmBWI - ONT
1 stop18h 39mAlaska Airlines
Deal found 1/15$391
This United Airlines deal was found by Cheapflights users on 1/16. 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.
Sat 4/121:35 pmONT - BWI
1 stop7h 05mUnited Airlines
Sun 4/206:31 amBWI - ONT
1 stop11h 19mUnited Airlines
Deal found 1/16$397

Find flights from Ontario to Washington, D.C. within your budget

Customize your flight search to find flights from Ontario to Washington, D.C. 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 January 16, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 4/2

7:58 pm-11:05 am

1 stop12h 07m

Baltimore/Washington

Wed 4/9

8:49 pm-7:29 am

1 stop13h 40m

$130

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 2/13

12:59 am-12:03 pm

1 stop8h 04m

Washington, D.C. Reagan-National

Sat 2/22

1:03 pm-12:09 am

1 stop14h 06m

$236

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 2/19

7:00 am-9:59 pm

2 stops11h 59m

Washington, D.C. Reagan-National

Tue 2/25

6:00 pm-11:59 pm

1 stop8h 59m

$307

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sat 2/1

6:00 am-5:57 pm

1 stop8h 57m

Washington, D.C. Dulles Intl

Tue 2/4

6:57 pm-10:38 am

1 stop18h 41m

$326

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Fri 2/7

1:21 pm-11:32 pm

1 stop7h 11m

Baltimore/Washington

Sun 2/9

7:15 am-12:24 pm

1 stop8h 09m

$327

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sun 2/16

6:00 am-4:00 pm

1 stop7h 00m

Washington, D.C. Reagan-National

Wed 2/19

6:00 am-11:55 am

1 stop8h 55m

$327

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 2/13

1:21 pm-11:34 pm

1 stop7h 13m

Washington, D.C. Dulles Intl

Tue 2/18

7:20 am-12:24 pm

1 stop8h 04m

$327

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 1/29

6:00 am-5:59 pm

2 stops8h 59m

Washington, D.C. Reagan-National

Sun 2/2

12:59 pm-6:37 pm

1 stop8h 38m

$332

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Sun 2/2

7:30 pm-8:45 am

2 stops10h 15m

Baltimore/Washington

Tue 2/4

8:23 am-6:37 pm

2 stops13h 14m

$337

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sun 2/23

10:50 pm-8:42 am

1 stop6h 52m

Washington, D.C. Dulles Intl

Wed 2/26

6:12 am-1:58 pm

1 stop10h 46m

$362

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/16

Showing 1-10 of 36 results
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Compare providers for flights from Ontario to Washington, D.C.

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 Ontario to Washington, D.C. in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 starsTrust Score*3 stars
FlightnetworkPrice Accuracy-Trust Score*3 stars
CheapOairPrice Accuracy2 starsTrust Score*2 stars
Kiwi.comPrice 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 Ontario-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Washington, D.C. flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Washington, D.C. 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 Ontario-Washington, D.C. 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 Ontario to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Ontario 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 Ontario to Washington, D.C.

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

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Washington, D.C.. Price data was last updated on January 10, 2025.

The price you pay for your flight from Ontario to Washington, D.C. may vary depending on when you book. For the best chance of a lower fare, look to book 61 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, August is the cheapest month in which you can book a flight from Ontario to Washington, D.C. (average of $241). Flying from Ontario to Washington, D.C. in March is currently the most expensive (average of $290). 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 ONT to WAS?

Find hourly flight availability from Ontario to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 16, 2025.

It’s typically best to fly out from Ontario to Washington, D.C. in the afternoon. Doing so could potentially save you 32% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Ontario to Washington, D.C.?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Washington, D.C.. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to Washington, D.C. flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. when rainfall is around 2.6 in.

Temperature in Washington, D.C. by month

Plan your trip to Washington, D.C. by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C., 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. 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 Washington, D.C.. Reviews last updated January 16, 2025.
Get a feel of what it's like to fly with Alaska Airlines, United Airlines and Frontier from Ontario to Washington, D.C. by reading reviews from past customers. 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
4,659 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Food

7.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Food

7.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,681 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Food

7.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,511 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Food

7.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,965 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Food

7.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Entertainment

7.7

Overall

8.1

Comfort

8.1

Food

7.2

Crew

8.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Washington, D.C.. 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 from for flights from Ontario to Washington, D.C.?

    If you book a flight to Washington, D.C. from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from Ontario to Washington, D.C. per day from 7 different airlines.

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

    Cheapflights users have booked flights from Ontario to Washington, D.C. round-trip from $130. Other airlines that can offer you cheap pricing are Alaska Airlines, from $326, and Delta, from $327. Users have found that Frontier is 63% cheaper than the other options available to this destination.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $64. Users have also found prices from $161 and $164 on Alaska Airlines and Delta, respectively.

  • What are the most popular routes from Ontario to Washington, D.C.?

    When deciding which route to take from Ontario to Washington, D.C. consider Ontario - Washington, D.C. Reagan-National, Ontario - Washington, D.C. Dulles Intl or Ontario - Baltimore/Washington as they are the most popular.

  • Can I find deals for flights from Ontario to Washington, D.C. that include hotel bookings?

    Yes. In addition to deals on Ontario to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Washington, D.C.?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Washington, D.C..

  • Can I find deals for business class flights from Ontario to Washington, D.C.?

    Yes. Cheapflights offers flight deals from Ontario to Washington, D.C. 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 Ontario to Washington, D.C.?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Washington, D.C. (average of $241). Flying from Ontario to Washington, D.C. in March is currently the most expensive (average of $290). 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

Traveling to a place near Ontario?

Book flights to Ontario if you plan to visit one of these locations
Fairfax
Arlington
Alexandria
Springfield
Silver Spring
Rockville
Tysons
Gaithersburg
Fredericksburg
Linthicum Heights
Laurel
Falls Church
Greenbelt
Easton
Oxon Hill
Herndon
Woodbridge
Bowie
Reston
National Harbor

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Alternative routes for Ontario to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Ontario to Washington, D.C.

Discover the top 7 airlines that operate flights from Ontario to Washington, D.C.. 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 January 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$148Average$294FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$151Average$251FlexibilityNo cancel feeOn-time65%
Alaska AirlinesCheapest$168Average$288FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$197Average$518FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$256Average$504FlexibilityNo cancel feeOn-time69%
DeltaCheapest$262Average$440FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$301Average$492FlexibilityNo cancel feeOn-time63%
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