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Washington, D.C.

$104+ 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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — WAS
Jun 13 — Jun 201
Sat 6/13
Sat 6/20
1 adult, Economy
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Find cheap flights from Ontario to Washington, D.C. with Cheapflights

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Cheap 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 May 14, 2026.

This Expedia deal was found by Cheapflights users on 5/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/28:06 pm
ONT
-
BWI
1 stop21h 12m
Frontier
Tue 6/94:29 pm
BWI
-
ONT
1 stop28h 23m
Frontier
Deal found 5/9$210
This Expedia deal was found by Cheapflights users on 5/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/38:06 pm
ONT
-
BWI
1 stop21h 12m
Frontier
Tue 6/94:29 pm
BWI
-
ONT
1 stop28h 23m
Frontier
Deal found 5/11$230
This Frontier deal was found by Cheapflights users on 5/10. 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 5/274:39 pm
ONT
-
IAD
1 stop12h 33m
Frontier
Mon 6/19:12 am
IAD
-
ONT
1 stop13h 20m
Frontier
Deal found 5/10$234
This Booking.com deal was found by Cheapflights users on 5/9. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/53:30 pm
ONT
-
IAD
1 stop13h 42m
Frontier
Tue 6/99:55 am
IAD
-
ONT
1 stop8h 13m
Frontier
Deal found 5/9$237
This Frontier deal was found by Cheapflights users on 5/10. 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 8/1310:49 am
ONT
-
DCA
1 stop8h 10m
Frontier
Sat 8/156:00 pm
DCA
-
ONT
1 stop8h 50m
Frontier
Deal found 5/10$238
This Frontier deal was found by Cheapflights users on 5/10. 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 5/283:30 pm
ONT
-
IAD
1 stop13h 42m
Frontier
Tue 6/29:12 am
IAD
-
ONT
1 stop9h 32m
Frontier
Deal found 5/10$240
This Booking.com deal was found by Cheapflights users on 5/9. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/151:28 pm
ONT
-
IAD
1 stop15h 52m
Frontier
Sun 7/199:50 am
IAD
-
ONT
1 stop13h 03m
Frontier
Deal found 5/9$242
This Expedia deal was found by Cheapflights users on 5/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/96:00 am
ONT
-
DCA
1 stop27h 51m
Frontier
Sat 8/227:00 am
DCA
-
ONT
1 stop30h 05m
Frontier
Deal found 5/9$244
This Frontier deal was found by Cheapflights users on 5/10. 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.
Fri 6/53:30 pm
ONT
-
IAD
1 stop13h 42m
Frontier
Mon 6/81:31 pm
IAD
-
ONT
1 stop8h 40m
Frontier
Deal found 5/10$244
This Booking.com deal was found by Cheapflights users on 5/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/43:30 pm
ONT
-
IAD
1 stop13h 42m
Frontier
Thu 6/119:55 am
IAD
-
ONT
1 stop12h 56m
Frontier
Deal found 5/10$246
This Expedia deal was found by Cheapflights users on 5/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/285:43 pm
ONT
-
BWI
1 stop23h 53m
Frontier
Tue 8/114:29 pm
BWI
-
ONT
1 stop28h 20m
Frontier
Deal found 5/10$250
This Frontier deal was found by Cheapflights users on 5/12. 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.
Fri 8/1410:49 am
ONT
-
DCA
1 stop8h 10m
Frontier
Tue 8/186:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Deal found 5/12$250

Find 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 May 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$210
(Expedia)

One-way from

$104
(Super.com)

Popular in

December

Cheapest in

May

Average price

$221

Good round-trip deal

$462 or less

Good one-way deal

$228 or less
Provider with most accurate pricing for Ontario-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Washington, D.C. (WAS) flights.
Search Deals
From Ontario to Washington, D.C. (WAS)
Search Deals
One-way flight from Ontario to Washington, D.C. (WAS)
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($76 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Washington, D.C. (WAS).
Search Deals
Price to beat on a one-way flight from Ontario to Washington, D.C. (WAS).
Search Deals

Cheapflights Fare Finder

 
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 May 14, 2026.
Use the filters below to find and compare flights from Ontario to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 8/4

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Mon 8/10

1:59 pm-10:03 am

1 stop23h 04m

$262

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 7/28

1:50 pm-12:55 am

1 stop8h 05m

Washington, D.C. Dulles Intl

Tue 8/11

1:13 pm-7:57 pm

1 stop9h 44m

$321

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 5/27

12:07 pm-12:51 am

1 stop9h 44m

Washington, D.C. Dulles Intl

Thu 5/28

12:37 pm-6:36 pm

1 stop8h 59m

$321

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 7/28

1:50 pm-12:55 am

1 stop8h 05m

Washington, D.C. Dulles Intl

Thu 8/13

6:42 am-12:12 pm

1 stop8h 30m

$321

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Mon 6/1

6:30 pm-5:27 am

1 stop7h 57m

Washington, D.C. Dulles Intl

Tue 6/30

6:30 am-12:47 pm

1 stop9h 17m

$321

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 7/28

10:00 pm-9:26 am

1 stop8h 26m

Washington, D.C. Dulles Intl

Tue 8/11

6:00 am-12:05 pm

2 stops9h 05m

$326

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 9/22

9:55 am-11:29 pm

2 stops10h 34m

Washington, D.C. Dulles Intl

Tue 10/6

5:00 pm-11:48 pm

2 stops9h 48m

$331

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 7/8

5:30 am-5:00 pm

1 stop8h 30m

Washington, D.C. Reagan-National

Tue 7/14

6:35 pm-10:35 pm

1 stop7h 00m

$341

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 9/8

7:13 pm-7:05 am

1 stop8h 52m

Washington, D.C. Dulles Intl

Sun 9/13

6:30 am-12:12 pm

1 stop8h 42m

$351

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 6/1

5:50 pm-11:02 am

2 stops14h 12m

Washington, D.C. Reagan-National

Fri 6/5

2:45 pm-11:34 pm

2 stops11h 49m

$386

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/9

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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 May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Washington, D.C.

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

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 15 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, June is the cheapest month in which you can book a flight from Ontario to Washington, D.C. (average of $68). Flying from Ontario to Washington, D.C. in February is currently the most expensive (average of $221). 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 May 14, 2026.

When flying from Ontario to Washington, D.C., the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Ontario to Washington, D.C.?

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 May 14, 2026.
Read through reviews of airlines operating flights from Ontario to Washington, D.C., such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,297 reviews

Food

7.0

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
7.9
Good
4,297 reviews
Southwest
7.9
Good
4,297 reviews

Food

7.0

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Delta
7.9
Good
8,456 reviews
Southwest
7.9
Good
4,297 reviews

Food

7.0

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
United Airlines
7.4
Good
9,712 reviews
Southwest
7.9
Good
4,297 reviews

Food

7.0

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.1
Good
11,669 reviews
Southwest
7.9
Good
4,297 reviews

Food

7.0

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Frontier
5.6
Fair
2,952 reviews
Southwest
7.9
Good
4,297 reviews

Food

7.0

Comfort

8.0

Overall

7.9

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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 5 different airlines.

  • How long is the flight from Ontario to Washington, D.C.?

    Departing from Ontario to Washington, D.C. will take you 8h 05m. Ontario and Washington, D.C. are separated by a distance of 2236 mi. This flight may include one or multiple stops.

  • 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 $166. Other airlines that can offer you cheap pricing are Delta, from $172, and United Airlines, from $226. Users have found that Frontier is 54% 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 $77. Users have also found prices from $128 and $129 on United Airlines and Southwest, 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. Dulles Intl, Ontario - Baltimore/Washington or Ontario - Washington, D.C. Reagan-National 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, June is the cheapest month in which you can book a flight from Ontario to Washington, D.C. (average of $68). Flying from Ontario to Washington, D.C. in February is currently the most expensive (average of $221). 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 Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Tysons
Owings Mills
Springfield
Arlington
Herndon
Rockville
Hyattsville
Manassas
Fredericksburg
Silver Spring
Hanover
Laurel
Woodbridge
Waldorf
Largo
Clinton
Hunt Valley
Cordova
Reston

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from Ontario to Washington, D.C.

Discover the top 5 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 May 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$128Average$399FlexibilityNo cancel feeOn-timeN/A
FrontierCheapest$136Average$291FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$226Average$455FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$256Average$514FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$258Average$458FlexibilityNo cancel feeOn-time63%

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