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$101+ Cheap flights from Reagan-National (DCA) to Ontario (ONT)

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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — ONT
Jun 14 — Jun 211
Sun 6/14
Sun 6/21
1 adult, Economy
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Cheap flight deals from Reagan-National to Ontario

Cheapest flights from Reagan-National to Ontario
Explore the most affordable flight options available from Reagan-National to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 15, 2026.

This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Wed 9/210:50 am
ONT
-
DCA
1 stop8h 09m
Frontier
Deal found 5/11$210
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.
Sat 6/66:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Wed 9/26:00 am
ONT
-
DCA
1 stop12h 59m
Frontier
Deal found 5/12$224
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.
Tue 6/26:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Wed 9/26:00 am
ONT
-
DCA
1 stop12h 59m
Frontier
Deal found 5/12$230
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.
Sat 6/61:59 pm
DCA
-
ONT
1 stop12h 50m
Frontier
Sat 8/296:00 am
ONT
-
DCA
1 stop7h 57m
Frontier
Deal found 5/12$238
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/286:00 pm
DCA
-
ONT
1 stop19h 05m
Frontier
Tue 6/26:00 am
ONT
-
DCA
1 stop12h 58m
Frontier
Deal found 5/12$240
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.
Tue 6/26:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Thu 8/276:00 am
ONT
-
DCA
1 stop7h 57m
Frontier
Deal found 5/12$244
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/101:59 pm
DCA
-
ONT
1 stop23h 04m
Frontier
Thu 8/1310:49 am
ONT
-
DCA
1 stop8h 10m
Frontier
Deal found 5/11$249
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/26:00 pm
DCA
-
ONT
1 stop8h 49m
Frontier
Sat 6/66:00 am
ONT
-
DCA
1 stop12h 58m
Frontier
Deal found 5/11$250
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/207:00 am
DCA
-
ONT
1 stop19h 49m
Frontier
Sun 8/236:00 am
ONT
-
DCA
1 stop27h 57m
Frontier
Deal found 5/12$254
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/161:59 pm
DCA
-
ONT
1 stop23h 04m
Frontier
Wed 8/1910:50 am
ONT
-
DCA
1 stop27h 07m
Frontier
Deal found 5/12$260
This Trip.com 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/206:00 pm
DCA
-
ONT
1 stop8h 50m
Frontier
Tue 7/286:00 am
ONT
-
DCA
1 stop27h 51m
Frontier
Deal found 5/12$261
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.
Sat 6/61:59 pm
DCA
-
ONT
1 stop12h 50m
Frontier
Mon 8/316:00 am
ONT
-
DCA
1 stop7h 57m
Frontier
Deal found 5/12$264

Find flight deals from Reagan-National to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Reagan-National (DCA) to Ontario (ONT). 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 15, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$210
(Frontier)

One-way from

$101
(Super.com)

Popular in

April

Cheapest in

May

Average price

$256
Provider with most accurate pricing for Washington, D.C. Reagan-National-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Reagan-National-Ontario flights.
Search Deals
From Washington, D.C. Reagan-National to Ontario
Search Deals
One-way flight from Washington, D.C. Reagan-National to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Reagan-National to Ontario 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 15, 2026.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 7/8

6:00 am-10:38 am

1 stop7h 38m

Ontario

Wed 7/15

11:48 am-10:48 pm

1 stop8h 00m

$321

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 8/19

6:00 am-10:42 am

1 stop7h 42m

Ontario

Mon 8/24

10:00 pm-9:10 am

1 stop8h 10m

$321

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 8/11

6:00 am-10:42 am

1 stop7h 42m

Ontario

Wed 8/12

7:05 am-5:28 pm

1 stop7h 23m

$321

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 7/15

6:00 am-10:38 am

1 stop7h 38m

Ontario

Wed 7/22

10:00 pm-9:16 am

1 stop8h 16m

$321

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Sat 8/15

1:42 pm-6:29 pm

1 stop7h 47m

Ontario

Sun 8/23

10:00 pm-9:10 am

1 stop8h 10m

$391

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 7/28

3:30 pm-10:51 pm

1 stop10h 21m

Ontario

Tue 8/4

5:45 am-6:31 pm

1 stop9h 46m

$431

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Fri 6/12

6:00 am-10:40 am

1 stop7h 40m

Ontario

Mon 6/15

7:05 am-6:30 pm

1 stop8h 25m

$440

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Tue 6/23

6:35 pm-10:35 pm

1 stop7h 00m

Ontario

Sat 6/27

5:30 am-4:45 pm

2 stops8h 15m

$446

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Thu 5/28

9:25 am-4:25 pm

2 stops10h 00m

Ontario

Fri 5/29

9:55 pm-9:45 am

2 stops8h 50m

$490

Washington, D.C.Ontario

DCA - ONT

DCAONT

Washington, D.C. Reagan-National

Wed 6/24

4:55 pm-11:00 pm

2 stops9h 05m

Ontario

Sun 6/28

11:55 pm-2:00 pm

1 stop11h 05m

$496

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/13

Showing 1-10 of 24 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Reagan-National to Ontario

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 Reagan-National to Ontario 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 Washington, D.C. Reagan-National Airport-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Reagan-National Airport-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Reagan-National Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Reagan-National Airport-Ontario 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 Washington, D.C. Reagan-National Airport-Ontario 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 Reagan-National to Ontario

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

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

Currently, May is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Ontario (average of $256). Flying from Washington, D.C. Reagan-National Airport to Ontario in April is currently the most expensive (average of $568). 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 Washington, D.C. Reagan-National Airport to Ontario?

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated May 15, 2026.
See what other customers who have flown with Southwest,American Airlines, andFrontier from Washington, D.C. Reagan-National Airport to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,299 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,299 reviews
Southwest
8.0
Very good
4,299 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,663 reviews
Southwest
8.0
Very good
4,299 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.6
Fair
2,951 reviews
Southwest
8.0
Very good
4,299 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Overall

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Related info for your journey

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

    Ontario (ONT) is the airport you will fly into if you book a flight from Washington, D.C. Reagan-National to Ontario. You should not have trouble finding flights to Ontario from Washington, D.C. Reagan-National; the airport handles an average of 0 inbound flights from Washington, D.C. Reagan-National per day. You should also have plenty of airline options to choose from since 3 airlines have flights to the Ontario airport from Washington, D.C. Reagan-National. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

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

    There are many flights that can get you from Washington, D.C. Reagan-National Airport to Ontario in 7h 42m. Fly via Delta to get the fastest option. The distance from Washington, D.C. Reagan-National Airport to Ontario is about 2258 mi.

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

    Our cheapest airline available from Washington, D.C. Reagan-National Airport to Ontario is Frontier. Our recent data shows that you can find tickets from as low as $176 on this airline. Additional options worth looking into are American Airlines and Southwest, starting at $256 and $361 round-trip. Frontier is priced at 55% lower than the current average price of a flight leaving 3 months from now.

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

    The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $93. However, be on the lookout for offers from United Airlines and Southwest, as they are both options that can get you from Washington, D.C. Reagan-National Airport to Ontario for a low price.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Reagan-National to Ontario 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 Washington, D.C. Reagan-National Airport to Ontario?

    Currently, May is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Ontario (average of $256). Flying from Washington, D.C. Reagan-National Airport to Ontario in April is currently the most expensive (average of $568). 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.

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Alternative routes for Reagan-National to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Reagan-National to Ontario

Discover the top 3 airlines that operate flights from Reagan-National to Ontario. 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 15, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$176Average$290FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$256Average$527FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$361Average$485FlexibilityNo cancel feeOn-time63%

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