HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Reagan-National

$80+ 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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DCA
May 24 — May 311
Sun 5/24
Sun 5/31
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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”

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.

Cheap 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 April 24, 2026.

This CheapOair deal was found by Cheapflights users on 4/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/236:00 am
ONT
-
DCA
1 stop27h 59m
Frontier
Fri 5/297:00 am
DCA
-
ONT
1 stop30h 05m
Frontier
Deal found 4/19$190
This Frontier deal was found by Cheapflights users on 4/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:50 am
ONT
-
DCA
1 stop8h 08m
Frontier
Sat 5/96:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Deal found 4/21$200
This Frontier deal was found by Cheapflights users on 4/20. 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 5/126:00 am
ONT
-
DCA
1 stop12h 58m
Frontier
Wed 5/131:59 pm
DCA
-
ONT
1 stop12h 50m
Frontier
Deal found 4/20$205
This Booking.com deal was found by Cheapflights users on 4/20. 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 5/610:50 am
ONT
-
DCA
1 stop23h 09m
Frontier
Sat 5/96:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Deal found 4/20$207
This Frontier deal was found by Cheapflights users on 4/19. 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.
Sat 5/212:59 am
ONT
-
DCA
1 stop9h 00m
Frontier
Sat 5/91:59 pm
DCA
-
ONT
1 stop12h 50m
Frontier
Deal found 4/19$210
This Trip.com deal was found by Cheapflights users on 4/21. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/45:33 pm
ONT
-
DCA
1 stop25h 25m
Frontier
Sat 5/96:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Deal found 4/21$213
This Mytrip deal was found by Cheapflights users on 4/19. 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.
Fri 5/226:00 am
ONT
-
DCA
1 stop12h 58m
Frontier
Fri 5/297:00 am
DCA
-
ONT
1 stop30h 05m
Frontier
Deal found 4/19$215
This CheapOair deal was found by Cheapflights users on 4/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/166:00 am
ONT
-
DCA
1 stop27h 59m
Frontier
Tue 5/197:00 am
DCA
-
ONT
1 stop19h 49m
Frontier
Deal found 4/20$216

Find 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 April 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$190
(CheapOair)

One-way from

$80
(Frontier)

Popular in

March

Cheapest in

January

Average price

$350
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. 6% potential increase in price ($25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
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 April 24, 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 5/26

10:00 pm-9:16 am

1 stop8h 16m

Washington, D.C. Reagan-National

Tue 6/2

5:28 pm-11:34 pm

2 stops9h 06m

$262

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 8/11

6:00 am-4:21 pm

1 stop7h 21m

Washington, D.C. Reagan-National

Mon 8/17

3:05 pm-11:44 pm

2 stops11h 39m

$262

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 5/12

6:00 am-6:40 pm

2 stops9h 40m

Washington, D.C. Reagan-National

Sun 5/24

6:05 am-12:19 pm

2 stops9h 14m

$331

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 6/3

6:15 am-6:20 pm

2 stops9h 05m

Washington, D.C. Reagan-National

Wed 6/10

12:00 pm-5:55 pm

1 stop8h 55m

$361

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 7/30

5:16 pm-8:36 am

2 stops12h 20m

Washington, D.C. Reagan-National

Sun 8/2

12:27 pm-6:23 pm

1 stop8h 56m

$361

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Sat 8/22

5:45 am-3:55 pm

1 stop7h 10m

Washington, D.C. Reagan-National

Tue 8/25

4:35 pm-9:59 pm

1 stop8h 24m

$363

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 6/16

10:00 pm-9:15 am

1 stop8h 15m

Washington, D.C. Reagan-National

Tue 6/23

2:45 pm-11:45 pm

2 stops12h 00m

$396
Quickest round-trip

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Tue 7/21

6:30 am-5:12 pm

1 stop7h 42m

Washington, D.C. Reagan-National

Tue 7/28

6:10 pm-10:51 pm

1 stop7h 41m

$426

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Wed 6/17

5:15 am-6:15 pm

2 stops10h 00m

Washington, D.C. Reagan-National

Tue 6/23

6:35 pm-10:35 pm

1 stop7h 00m

$431

OntarioWashington, D.C.

ONT - DCA

ONTDCA

Ontario

Thu 7/16

6:30 am-6:12 pm

1 stop8h 42m

Washington, D.C. Reagan-National

Tue 7/21

5:00 pm-10:51 pm

1 stop8h 51m

$431

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/21

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

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 April.
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. Reagan-National Airport 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. Reagan-National Airport flight deals on Cheapflights vs. FlightHub >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 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. 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?

Booking 17 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, January is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $265). Flying from Ontario to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of $501). 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.

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

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 April 24, 2026.
Read through reviews of airlines operating flights from Ontario to Washington, D.C. Reagan-National Airport, such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,333 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
8.0
Very good
4,333 reviews
Southwest
8.0
Very good
4,333 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
8,450 reviews
Southwest
8.0
Very good
4,333 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
9,643 reviews
Southwest
8.0
Very good
4,333 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
11,666 reviews
Southwest
8.0
Very good
4,333 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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
5.7
Fair
2,980 reviews
Southwest
8.0
Very good
4,333 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Overall

8.0

Crew

8.6

Entertainment

7.5

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 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?

    Delta can get you from Ontario to Washington, D.C. Reagan-National Airport in just under 8h 16m. Your travel time can differ by up to . Ontario and Washington, D.C. Reagan-National Airport are separated by a distance of 2258 mi.

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

    Frontier, at $166, was found to be the cheapest airline from Ontario to Washington, D.C. Reagan-National Airport.Alternate airlines to your destination round-trip include Delta and United Airlines. You may be able to fly from Ontario to Washington, D.C. Reagan-National Airport for 53% less than the average price by searching for these airlines.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $84. However, be on the lookout for offers from Southwest and American Airlines, as they are both options that can get you from Ontario to Washington, D.C. Reagan-National Airport for a low price.

  • 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, January is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Reagan-National Airport (average of $265). Flying from Ontario to Washington, D.C. Reagan-National Airport in March is currently the most expensive (average of $501). 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
Owings Mills
Springfield
Arlington
Woodbridge
Silver Spring
Herndon
Rockville
Hyattsville
Fredericksburg
Hanover
Laurel
Manassas
Largo
Upper Marlboro
Waldorf
Bowie
Clinton
Hunt Valley

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 Ontario to Reagan-National

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Reagan-National flights
Los Angeles to Baltimore flights
Los Angeles to Dulles Intl flights
San Francisco to Dulles Intl flights
San Francisco to Reagan-National flights
San Francisco to Baltimore flights
Ontario to Dulles Intl flights
San Diego to Dulles Intl flights
Ontario to Baltimore flights
San Diego to Baltimore flights
Sacramento to Dulles Intl flights
San Diego to Reagan-National flights
San Jose to Dulles Intl flights
Las Vegas to Dulles Intl flights
San Jose to Baltimore flights
Santa Ana to Dulles Intl flights
Oakland to Dulles Intl flights
San Jose to Reagan-National flights
Las Vegas to Baltimore flights
Oakland to Baltimore flights
Santa Ana to Baltimore flights
Burbank to Dulles Intl flights
Las Vegas to Reagan-National flights
Sacramento to Reagan-National flights
Santa Ana to Reagan-National flights
Sacramento to Baltimore flights
Oakland to Reagan-National flights
Burbank to Baltimore flights
Reno to Dulles Intl flights
Fresno to Dulles Intl flights
Long Beach to Dulles Intl flights
Fresno to Reagan-National flights
Burbank to Reagan-National flights
Reno to Reagan-National flights
Reno to Baltimore flights
Palm Springs to Dulles Intl flights
Fresno to Baltimore flights
San Luis Obispo to Dulles Intl flights
Santa Barbara to Dulles Intl flights
Palm Springs to Reagan-National flights
Medford to Baltimore flights
Santa Barbara to Baltimore flights
Medford to Reagan-National flights
Long Beach to Reagan-National flights
Palm Springs to Baltimore flights
Monterey to Reagan-National flights

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 April 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$166Average$275FlexibilityNo cancel feeOn-time62%
DeltaCheapest$208Average$389FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$226Average$409FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$258Average$442FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$318Average$494FlexibilityNo cancel feeOn-time71%

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.
Site
©2026 Cheapflights