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Washington, D.C.

$58+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — WAS
Jan 9 — Jan 161
Fri 1/9
Fri 1/16
1 adult, Economy
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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 December 10, 2025.

This Frontier deal was found by Cheapflights users on 12/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:45 amONT - DCA
1 stop12h 14mFrontier
Thu 1/16:00 pmDCA - ONT
1 stop8h 59mFrontier
Deal found 12/9$253
This Frontier deal was found by Cheapflights users on 12/7. 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 12/316:45 amONT - DCA
1 stop12h 14mFrontier
Tue 1/132:00 pmDCA - ONT
1 stop11h 59mFrontier
Deal found 12/7$257
This Expedia deal was found by Cheapflights users on 12/10. 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.
Thu 12/256:45 amONT - DCA
1 stop12h 14mFrontier
Thu 1/18:00 amDCA - ONT
1 stop18h 59mFrontier
Deal found 12/10$258
This Mytrip deal was found by Cheapflights users on 12/8. 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.
Mon 12/153:20 pmONT - DCA
1 stop18h 46mFrontier
Mon 1/56:00 pmDCA - ONT
1 stop8h 59mFrontier
Deal found 12/8$260
This Gotogate deal was found by Cheapflights users on 12/8. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/308:19 amONT - BWI
1 stop8h 34mFrontier
Thu 1/87:45 pmBWI - ONT
1 stop28h 38mFrontier
Deal found 12/8$264
This Frontier deal was found by Cheapflights users on 12/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:45 amONT - DCA
1 stop12h 14mFrontier
Sun 1/46:00 pmDCA - ONT
1 stop8h 59mFrontier
Deal found 12/9$267
This Booking.com deal was found by Cheapflights users on 12/9. 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 12/246:45 amONT - DCA
1 stop12h 14mFrontier
Fri 1/26:00 pmDCA - ONT
1 stop8h 59mFrontier
Deal found 12/9$275
This Trip.com deal was found by Cheapflights users on 12/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:45 amONT - DCA
1 stop27h 16mFrontier
Sat 1/38:00 amDCA - ONT
1 stop18h 59mFrontier
Deal found 12/10$279
This Frontier deal was found by Cheapflights users on 12/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:45 amONT - DCA
1 stop12h 14mFrontier
Sat 1/32:00 pmDCA - ONT
1 stop12h 59mFrontier
Deal found 12/9$282
This Expedia deal was found by Cheapflights users on 12/8. 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 12/246:20 pmONT - BWI
1 stop14h 24mFrontier
Sun 1/49:03 pmBWI - ONT
1 stop13h 21mFrontier
Deal found 12/8$318
This Frontier deal was found by Cheapflights users on 12/8. 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.
Tue 12/308:19 amONT - BWI
1 stop8h 34mFrontier
Sun 1/49:03 pmBWI - ONT
1 stop13h 21mFrontier
Deal found 12/8$338
This Frontier deal was found by Cheapflights users on 12/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/198:04 amONT - BWI
1 stop9h 09mFrontier
Thu 1/1512:42 pmBWI - ONT
1 stop9h 19mFrontier
Deal found 12/9$342

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 December 10, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$199
(Kiwi.com)

One-way from

$58
(Trip.com)

Popular in

November

Cheapest in

September

Average price

$421

Good round-trip deal

$533 or less

Good one-way deal

$196 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. 24% potential increase in price ($112 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 10, 2025.
Use the filters below to find and compare flights from Ontario to Washington, D.C. that are best for you.

Fly from

Ontario

Fly to

Washington, D.C.

Route

Depart

Return

Price

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 1/22

6:00 am-4:26 pm

1 stop31h 26m

Washington, D.C. Dulles Intl

Mon 1/26

6:04 pm-3:08 pm

1 stop24h 04m

$287

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 1/8

4:03 pm-4:26 pm

1 stop21h 23m

Washington, D.C. Dulles Intl

Mon 1/12

6:04 pm-3:08 pm

1 stop24h 04m

$287

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Fri 2/6

11:53 am-4:26 pm

1 stop25h 33m

Washington, D.C. Dulles Intl

Sun 2/8

6:04 pm-10:59 am

1 stop19h 55m

$306

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 12/25

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

Fri 1/2

6:00 pm-11:59 pm

1 stop8h 59m

$307

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Tue 2/24

7:30 am-11:46 pm

2 stops13h 16m

Washington, D.C. Dulles Intl

Sat 2/28

7:30 am-1:54 pm

1 stop9h 24m

$312

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Thu 1/8

12:41 pm-11:37 pm

1 stop7h 56m

Washington, D.C. Dulles Intl

Wed 1/14

6:20 am-11:31 am

1 stop8h 11m

$334

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Sun 1/11

7:30 am-11:10 pm

1 stop12h 40m

Washington, D.C. Dulles Intl

Sat 1/31

7:30 am-1:56 pm

1 stop9h 26m

$336

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 12/24

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

Wed 12/31

2:00 pm-11:59 pm

1 stop12h 59m

$342

OntarioWashington, D.C.

ONT - IAD

ONTIAD

Ontario

Wed 3/4

4:02 pm-5:20 pm

1 stop22h 18m

Washington, D.C. Dulles Intl

Mon 3/9

7:05 am-11:32 pm

1 stop19h 27m

$345

OntarioBaltimore

ONT - BWI

ONTBWI

Ontario

Wed 3/4

12:02 pm-5:46 pm

1 stop26h 44m

Baltimore/Washington

Mon 3/9

6:46 pm-11:08 am

1 stop19h 22m

$346

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 60 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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
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 Ontario-Washington, D.C. flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Washington, D.C. flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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 $93). Flying from Ontario to Washington, D.C. in December is currently the most expensive (average of $179). 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 December 10, 2025.

It’s typically best to fly out from Ontario to Washington, D.C. in the afternoon. Doing so could potentially save you 17% 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 6, 2025.

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

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

What’s the top layover airport for flights from Ontario to Washington, D.C.?

Share of 1-stop round-trip flights from Ontario to Washington, D.C. chosen by Cheapflights users in the past 12 months, using the same layover each way.

Denver (DEN) – chosen by Cheapflights users on 96% of 1-stop itineraries from Ontario to Washington, D.C. on Cheapflights.

What’s the cheapest layover airport for flights from Ontario to Washington, D.C.?

Average round-trip fare for 1-stop flights from Ontario to Washington, D.C., chosen by Cheapflights users in the past 12 months, with the same layover each way.

Denver (DEN) is the most affordable 1-stop option, with an average round-trip price of $346.

What’s the fastest layover option from Ontario to Washington, D.C.?

Shortest average travel time for 1-stop one-way flights from Ontario to Washington, D.C., based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Denver (DEN) have the shortest average one-way travel time for 1-stop routes: 7h 15m.

Which airport typically offers the quickest layover for flights from Ontario to Washington, D.C.?

Average layover duration for 1-stop one-way flights from Ontario to Washington, D.C., chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 1h 18m.

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 December 10, 2025.
Read through reviews of airlines operating flights from Ontario to Washington, D.C., such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,253 reviews

Overall

7.9

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Overall

7.9

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
8,007 reviews
Southwest
7.9
Good
4,253 reviews

Overall

7.9

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
9,092 reviews
Southwest
7.9
Good
4,253 reviews

Overall

7.9

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
7.2
Good
11,048 reviews
Southwest
7.9
Good
4,253 reviews

Overall

7.9

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

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
5.8
Fair
3,085 reviews
Southwest
7.9
Good
4,253 reviews

Overall

7.9

Food

7.0

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

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 6 different airlines.

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

    Departing from Ontario to Washington, D.C. will take you 12h 14m. Ontario and Washington, D.C. are separated by a distance of 2258 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 $147. Other airlines that can offer you cheap pricing are United Airlines, from $226, and Southwest, from $258. Users have found that Frontier is 56% 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 $71. Users have also found prices from $113 and $139 on United 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. Dulles Intl, Ontario - Washington, D.C. Reagan-National 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 $93). Flying from Ontario to Washington, D.C. in December is currently the most expensive (average of $179). 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
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fredericksburg
Fairfax
Linthicum Heights
Manassas
Rockville
Laurel
Towson
National Harbor
Bowie
Largo
McLean
Clinton

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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 6 airlines flying from Ontario to Washington, D.C.

Discover the top 6 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 December 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$98Average$224FlexibilityNo cancel feeOn-time65%
FrontierCheapest$147Average$275FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$226Average$455FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$258Average$460FlexibilityNo cancel feeOn-time63%
DeltaCheapest$276Average$387FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$278Average$466FlexibilityNo cancel feeOn-time71%

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