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Reagan-National

$65+ Cheap flights from Ontario (ONT) to Reagan-National (DCA)

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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DCA
Dec 5 — Dec 121
Fri 12/5
Fri 12/12
1 adult, Economy
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Find cheap flights from Ontario to Reagan-National 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”

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Cheapflights Tip: The best prices from Ontario to Washington, D.C. Reagan-National are usually found in September or February, booked 15 days in advance, depart on a Tuesday or Wednesday and return on a Saturday

Find flight deals from Ontario to Reagan-National

Cheapest flights from Ontario to Reagan-National
Explore the most affordable flight options available from Ontario to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 5, 2025.

This Mytrip deal was found by Cheapflights users on 11/5. 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.
Wed 11/128:45 amONT - DCA
1 stop25h 17mFrontier
Sat 11/152:00 pmDCA - ONT
1 stop24h 10mFrontier
Deal found 11/5$223
This Booking.com deal was found by Cheapflights users on 11/5. 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 11/2012:23 pmONT - DCA
1 stop6h 36mFrontier
Fri 11/218:00 amDCA - ONT
1 stop18h 57mFrontier
Deal found 11/5$226
This Booking.com deal was found by Cheapflights users on 11/5. 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.
Mon 11/247:06 pmONT - DCA
1 stop14h 57mFrontier
Tue 11/256:00 pmDCA - ONT
1 stop8h 57mFrontier
Deal found 11/5$230
This Frontier deal was found by Cheapflights users on 11/4. 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 11/2012:23 pmONT - DCA
1 stop6h 36mFrontier
Sun 11/232:00 pmDCA - ONT
1 stop12h 57mFrontier
Deal found 11/4$233
This Frontier deal was found by Cheapflights users on 11/3. 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.
Mon 11/106:53 amONT - DCA
1 stop12h 06mFrontier
Wed 11/192:00 pmDCA - ONT
1 stop10h 27mFrontier
Deal found 11/3$234
This Kiwi.com deal was found by Cheapflights users on 11/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/196:45 amONT - DCA
1 stop7h 14mFrontier
Sun 1/112:00 pmDCA - ONT
2 stops27h 31mFrontier
Deal found 11/4$236
This Trip.com deal was found by Cheapflights users on 11/5. 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.
Wed 11/128:45 amONT - DCA
1 stop10h 14mFrontier
Mon 11/176:00 pmDCA - ONT
1 stop8h 50mFrontier
Deal found 11/5$238
This Trip.com deal was found by Cheapflights users on 11/5. 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.
Mon 11/174:05 pmONT - DCA
1 stop21h 54mFrontier
Fri 11/212:00 pmDCA - ONT
1 stop12h 57mFrontier
Deal found 11/5$243
This Trip.com deal was found by Cheapflights users on 11/4. 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.
Thu 11/2012:23 pmONT - DCA
1 stop6h 36mFrontier
Mon 11/246:00 pmDCA - ONT
1 stop8h 57mFrontier
Deal found 11/4$244
This Trip.com deal was found by Cheapflights users on 11/5. 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.
Sat 11/2212:58 amONT - DCA
1 stop9h 05mFrontier
Wed 12/36:00 pmDCA - ONT
1 stop20h 09mFrontier
Deal found 11/5$245
This Frontier deal was found by Cheapflights users on 11/4. 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 11/2512:58 amONT - DCA
1 stop9h 05mFrontier
Sat 12/138:00 amDCA - ONT
1 stop9h 25mFrontier
Deal found 11/4$246
This Booking.com deal was found by Cheapflights users on 11/4. 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 11/144:05 pmONT - DCA
1 stop26h 54mFrontier
Tue 11/188:15 amDCA - ONT
1 stop16h 12mFrontier
Deal found 11/4$248

Cheap flight deals from Ontario to Reagan-National

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Reagan-National (DCA). 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 5, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$223
(Mytrip)

One-way from

$65
(Frontier)

Popular in

December

Cheapest in

September

Average price

$467
Provider with most accurate pricing for Ontario-Washington, D.C. Reagan-National flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Washington, D.C. Reagan-National flights.
Search Deals
From Ontario to Washington, D.C. Reagan-National
Search Deals
One-way flight from Ontario to Washington, D.C. Reagan-National
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($66 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Reagan-National 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 November 5, 2025.
Use the filters below to find and compare flights from Ontario to Washington, D.C. Reagan-National Airport that are best for you.

Fly from

Ontario

Fly to

Reagan-National

Route

Depart

Return

Price

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 12/3

6:15 am-4:59 pm

2 stops31h 44m

Washington, D.C. Reagan-National

Wed 12/10

1:00 pm-11:09 am

1 stop25h 09m

$250

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 3/5

6:55 pm-9:55 pm

1 stop24h 00m

Washington, D.C. Reagan-National

Tue 3/10

8:00 am-10:37 pm

1 stop17h 37m

$306

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Fri 12/5

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Sun 12/7

8:00 am-11:29 pm

1 stop18h 29m

$306

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 12/8

12:40 pm-3:27 pm

1 stop23h 47m

Washington, D.C. Reagan-National

Tue 12/16

4:55 pm-11:13 am

1 stop21h 18m

$307

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 12/25

6:45 am-9:59 pm

1 stop12h 14m

Washington, D.C. Reagan-National

Sun 1/4

2:00 pm-11:59 pm

1 stop12h 59m

$313

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 12/11

6:40 am-10:57 pm

2 stops13h 17m

Washington, D.C. Reagan-National

Sun 12/14

6:10 am-5:07 pm

2 stops13h 57m

$318

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 12/3

6:30 am-6:15 pm

1 stop8h 45m

Washington, D.C. Reagan-National

Wed 12/10

4:35 pm-8:45 pm

1 stop7h 10m

$325

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 12/6

6:00 am-9:59 pm

1 stop12h 59m

Washington, D.C. Reagan-National

Mon 12/8

8:00 am-11:29 pm

1 stop18h 29m

$331

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Mon 11/24

9:59 am-8:00 pm

1 stop7h 01m

Washington, D.C. Reagan-National

Tue 12/2

6:30 am-11:53 am

1 stop8h 23m

$333

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 12/23

6:04 am-6:43 pm

1 stop9h 39m

Washington, D.C. Reagan-National

Tue 12/30

6:00 pm-10:25 pm

1 stop7h 25m

$339

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 21 results
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Compare providers for flights from Ontario to Reagan-National

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 Reagan-National in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust 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. Reagan-National Airport flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Ontario-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from Ontario-Washington, D.C. Reagan-National Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Washington, D.C. Reagan-National Airport flights, Cheapflights users trust CheapOair the most. CheapOair 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. Reagan-National Airport 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 Reagan-National

Have a flexible travel schedule? Discover the best time to fly to Reagan-National 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. Reagan-National Airport

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

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Reagan-National. Price data was last updated on October 31, 2025.

Booking 15 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Washington, D.C. Reagan-National Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, June is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $99). Flying from Ontario to Washington, D.C. Reagan-National Airport in July is currently the most expensive (average of $228). 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 DCA?

Find hourly flight availability from Ontario to Reagan-National. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 5, 2025.

When flying from Ontario to Washington, D.C. Reagan-National Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 47% versus a flight at noon.

What is the cheapest day to fly from Ontario to Washington, D.C. Reagan-National Airport?

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

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

Reviews of airlines servicing Reagan-National

Get insights into the airlines that provide service to Reagan-National. 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 Reagan-National. Reviews last updated November 5, 2025.
Read through reviews of airlines operating flights from Ontario to Washington, D.C. Reagan-National Airport, 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
8.0
Very good
4,240 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
7.9
Good
8,004 reviews
Southwest
8.0
Very good
4,240 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
9,002 reviews
Southwest
8.0
Very good
4,240 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,042 reviews
Southwest
8.0
Very good
4,240 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,116 reviews
Southwest
8.0
Very good
4,240 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Boarding

8.1

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Reagan-National. 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. Reagan-National?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Washington, D.C. Reagan-National. You should not have trouble finding flights to Washington, D.C. Reagan-National from Ontario; the airport handles an average of 0 outbound flights to Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 5 airlines have flights from the Ontario airport to Washington, D.C. Reagan-National. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

  • How long is the flight from Ontario to Washington, D.C. Reagan-National Airport?

    Frontier, Alaska Airlines, and Delta can get you from Ontario to Washington, D.C. Reagan-National Airport in just under 23h 47m. Your travel time can differ by up to 7h 57m. Ontario and Washington, D.C. Reagan-National Airport are separated by a distance of 2258 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Frontier, at $147, was found to be the cheapest airline from Ontario to Washington, D.C. Reagan-National Airport.Alternate airlines to your destination round-trip include United Airlines and Southwest. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 61% less than the average price by searching for these airlines.

  • Can I find deals for flights from Ontario to Reagan-National that include hotel bookings?

    Yes. In addition to deals on Ontario to Reagan-National flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Reagan-National?

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

  • Can I find deals for business class flights from Ontario to Reagan-National?

    Yes. Cheapflights offers flight deals from Ontario to Reagan-National 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. Reagan-National Airport?

    Currently, June is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $99). Flying from Ontario to Washington, D.C. Reagan-National Airport in July is currently the most expensive (average of $228). 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. Reagan-National Airport?

Book flights to Washington, D.C. Reagan-National Airport if you plan to visit one of these locations
Alexandria
Tysons
Woodbridge
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fairfax
Fredericksburg
Falls Church
Linthicum Heights
Manassas
Laurel
Towson
National Harbor
Waldorf
Bowie
Largo
McLean

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Alternative routes for Ontario to Reagan-National

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to Reagan-National

Discover the top 5 airlines that operate flights from Ontario to Reagan-National. 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 November 5, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$147Average$291FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$226Average$427FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$258Average$448FlexibilityNo cancel feeOn-time63%
DeltaCheapest$284Average$398FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$326Average$497FlexibilityNo cancel feeOn-time71%

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