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Islip

$125+ Cheap flights from Reagan-National (DCA) to Islip, NY (ISP)

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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — ISP
nov. 26 — déc. 31
mer. 11/26
mer. 12/3
1 adult, Economy
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Cheap flight deals from Reagan-National to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Reagan-National (DCA) to Islip (ISP). 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 octobre 27, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$327
(Southwest)

One-way from

$125
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$273
Provider with most accurate pricing for Washington, D.C. Reagan-National-Islip Long Island flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. Reagan-National-Islip Long Island flights.
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From Washington, D.C. Reagan-National to Islip Long Island
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One-way flight from Washington, D.C. Reagan-National to Islip Long Island
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Highest demand for flights based on searches. 19% potential increase in price ($49 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Reagan-National to Islip

Cheapest flights from Reagan-National to Islip
Explore the most affordable flight options available from Reagan-National to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octobre 27, 2025.

This Southwest deal was found by Cheapflights users on 10/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 12/56:55 amDCA - ISP
1 stop5h 35mSouthwest
lun. 12/83:40 pmISP - DCA
1 stop7h 10mSouthwest
Deal found 10/27$327
This Southwest deal was found by Cheapflights users on 10/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 12/46:55 amDCA - ISP
2 stops8h 10mSouthwest
dim. 12/71:40 pmISP - DCA
2 stops9h 10mSouthwest
Deal found 10/27$367
This Southwest deal was found by Cheapflights users on 10/25. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 11/276:55 amDCA - ISP
1 stop7h 35mSouthwest
mar. 12/23:40 pmISP - DCA
1 stop7h 10mSouthwest
Deal found 10/25$388
This JetBlue deal was found by Cheapflights users on 10/26. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 11/86:30 amDCA - ISP
1 stop6h 18mJetBlue
dim. 11/910:44 amISP - DCA
1 stop6h 18mJetBlue
Deal found 10/26$440
This JetBlue deal was found by Cheapflights users on 10/26. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 11/106:30 amDCA - ISP
1 stop9h 10mJetBlue
ven. 11/141:55 pmISP - DCA
1 stop8h 20mJetBlue
Deal found 10/26$460
This Southwest deal was found by Cheapflights users on 10/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 11/206:55 amDCA - ISP
1 stop5h 35mSouthwest
dim. 11/237:00 amISP - DCA
1 stop8h 55mSouthwest
Deal found 10/26$467

Cheapflights Fare Finder

 
Customize your flight search to find flights from Reagan-National to Islip 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 octobre 27, 2025.
Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to Islip that are best for you.

Fly from

Reagan-National

Fly to

Islip

Route

Depart

Return

Price

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

ven. 12/5

6:55 am-12:30 pm

1 stop5h 35m

Islip Long Island

lun. 12/8

3:40 pm-10:50 pm

1 stop7h 10m

$327

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

jeu. 12/4

6:55 am-3:05 pm

2 stops8h 10m

Islip Long Island

dim. 12/7

1:40 pm-10:50 pm

2 stops9h 10m

$367

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

jeu. 3/5

6:05 am-4:30 pm

1 stop10h 25m

Islip Long Island

dim. 3/8

12:20 pm-8:50 pm

1 stop8h 30m

$372

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

jeu. 11/27

6:55 am-2:30 pm

1 stop7h 35m

Islip Long Island

mar. 12/2

3:40 pm-10:50 pm

1 stop7h 10m

$388

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

sam. 11/8

6:30 am-12:48 pm

1 stop6h 18m

Islip Long Island

dim. 11/9

10:44 am-5:02 pm

1 stop6h 18m

$440

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

lun. 11/10

6:30 am-3:40 pm

1 stop9h 10m

Islip Long Island

ven. 11/14

1:55 pm-10:15 pm

1 stop8h 20m

$460

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

jeu. 11/20

6:55 am-12:30 pm

1 stop5h 35m

Islip Long Island

dim. 11/23

7:00 am-3:55 pm

1 stop8h 55m

$467

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

mer. 2/4

12:15 pm-8:55 am

1 stop20h 40m

$127

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

mar. 1/27

12:15 pm-8:55 am

1 stop20h 40m

$127

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

lun. 1/26

12:15 pm-8:55 am

1 stop20h 40m

$127

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

Showing 1-10 of 16 results
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Compare providers for flights from Reagan-National to Islip

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 Islip in October.
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 Washington, D.C. Reagan-National Airport-Islip, New York flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Washington, D.C. Reagan-National Airport-Islip, New York flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Washington, D.C. Reagan-National Airport-Islip, New York 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-Islip, New York 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 Washington, D.C. Reagan-National Airport-Islip, New York 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 Islip

Have a flexible travel schedule? Discover the best time to fly to Islip 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 Islip

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

Currently, April is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Islip, New York (average of $54). Flying from Washington, D.C. Reagan-National Airport to Islip, New York in January is currently the most expensive (average of $188). 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.

Related info for your journey

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

    For a flight from Washington, D.C. Reagan-National to Islip, you will be flying into Long Island. Islip Long Island (ISP) is just 7.2 mi from the center of the city. Long Island is the only Islip airport and it handles 0 inbound flights from Washington, D.C. Reagan-National per day. 0 airlines have flights to Islip Long Island from Washington, D.C. Reagan-National on a regular basis.

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

    For as low as $327, Southwest can have you in Islip, New York from Washington, D.C. Reagan-National Airport in 5h 35m. The distance from Washington, D.C. Reagan-National Airport to Islip, New York is about 248 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Reagan-National to Islip 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 Islip, New York?

    Currently, April is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Islip, New York (average of $54). Flying from Washington, D.C. Reagan-National Airport to Islip, New York in January is currently the most expensive (average of $188). 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

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Alternative routes for Reagan-National to Islip

See prices for flight routes from nearby airports that may be better suited for you.
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