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Islip

$113+ Cheap flights from Reagan-National (DCA) to Islip (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 11/4. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — ISP
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$289
(Trip.com)

One-way from

$113
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$177
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. 20% potential increase in price ($54 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This Trip.com deal was found by Cheapflights users on 9/11. 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.
Tue 11/186:40 amDCA - ISP
1 stop6h 22mJetBlue
Sat 11/2212:09 pmISP - DCA
1 stop10h 20mJetBlue
Deal found 9/11$289
This JetBlue deal was found by Cheapflights users on 9/9. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/316:15 amDCA - ISP
1 stop6h 56mJetBlue
Mon 11/31:57 pmISP - DCA
1 stop8h 18mJetBlue
Deal found 9/9$334
This Southwest deal was found by Cheapflights users on 9/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/296:55 amDCA - ISP
1 stop9h 25mSouthwest
Fri 10/316:40 amISP - DCA
1 stop9h 20mSouthwest
Deal found 9/8$338
This Southwest deal was found by Cheapflights users on 9/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2111:55 amDCA - ISP
1 stop10h 40mSouthwest
Sat 11/226:00 amISP - DCA
1 stop5h 45mSouthwest
Deal found 9/10$352
This Southwest deal was found by Cheapflights users on 9/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/76:55 amDCA - ISP
2 stops8h 25mSouthwest
Tue 10/141:10 pmISP - DCA
1 stop9h 45mSouthwest
Deal found 9/9$378
This Southwest deal was found by Cheapflights users on 9/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1411:55 amDCA - ISP
1 stop10h 40mSouthwest
Sun 11/163:25 pmISP - DCA
1 stop7h 20mSouthwest
Deal found 9/10$393
This Priceline deal was found by Cheapflights users on 9/8. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/316:15 amDCA - ISP
1 stop6h 56mJetBlue
Sat 11/11:57 pmISP - DCA
1 stop8h 18mJetBlue
Deal found 9/8$429
This Southwest deal was found by Cheapflights users on 9/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/156:55 amDCA - ISP
1 stop9h 25mSouthwest
Sun 10/1912:55 pmISP - DCA
1 stop10h 00mSouthwest
Deal found 9/9$468
This Southwest deal was found by Cheapflights users on 9/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:55 amDCA - ISP
1 stop7h 40mSouthwest
Sun 10/512:55 pmISP - DCA
1 stop10h 00mSouthwest
Deal found 9/10$476

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 September 11, 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

Tue 11/18

6:40 am-1:02 pm

1 stop6h 22m

Islip Long Island

Sat 11/22

12:09 pm-10:29 pm

1 stop10h 20m

$289

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Fri 10/31

6:15 am-1:11 pm

1 stop6h 56m

Islip Long Island

Mon 11/3

1:57 pm-10:15 pm

1 stop8h 18m

$334

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Wed 10/29

6:55 am-3:20 pm

2 stops8h 25m

Islip Long Island

Fri 10/31

6:40 am-4:00 pm

1 stop9h 20m

$338

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Fri 11/21

11:55 am-10:35 pm

1 stop10h 40m

Islip Long Island

Sat 11/22

6:00 am-11:45 am

1 stop5h 45m

$352

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Tue 10/7

6:55 am-4:20 pm

1 stop9h 25m

Islip Long Island

Tue 10/14

1:10 pm-10:55 pm

1 stop9h 45m

$378

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Mon 10/6

11:50 am-10:10 pm

1 stop10h 20m

Islip Long Island

Wed 10/8

1:10 pm-10:55 pm

1 stop9h 45m

$378

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Fri 11/14

11:55 am-10:35 pm

1 stop10h 40m

Islip Long Island

Sun 11/16

3:25 pm-10:45 pm

1 stop7h 20m

$393

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Fri 10/31

6:15 am-1:11 pm

1 stop6h 56m

Islip Long Island

Sat 11/1

1:57 pm-10:15 pm

1 stop8h 18m

$429

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Tue 11/4

6:45 am-1:02 pm

1 stop6h 17m

$113

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Tue 10/28

6:45 am-1:02 pm

1 stop6h 17m

$113

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 17 results
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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?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Islip (average of $108). Flying from Washington, D.C. Reagan-National Airport to Islip in November is currently the most expensive (average of $213). 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 DCA to ISP?

Find hourly flight availability from Reagan-National to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

When flying from Washington, D.C. Reagan-National Airport to Islip, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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?

    A quick flight from Washington, D.C. Reagan-National Airport to Islip can take about 6h 22m. JetBlue provides one of the quickest options available for as low as $289. The distance from Washington, D.C. Reagan-National Airport to Islip is about 248 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Islip (average of $108). Flying from Washington, D.C. Reagan-National Airport to Islip in November is currently the most expensive (average of $213). 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 Islip?

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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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