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Islip

$152+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — ISP
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
1 adult, Economy
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Cheap 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 March 10, 2026.

This Southwest deal was found by Cheapflights users on 3/5. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/294:25 pm
DCA
-
ISP
1 stop6h 05m
Southwest
Sun 5/311:50 pm
ISP
-
DCA
1 stop9h 00m
Southwest
Deal found 3/5$327
This Southwest deal was found by Cheapflights users on 3/6. 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 4/76:05 am
DCA
-
ISP
1 stop10h 30m
Southwest
Wed 4/86:55 am
ISP
-
DCA
1 stop8h 50m
Southwest
Deal found 3/6$332
This Southwest deal was found by Cheapflights users on 3/7. 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 5/86:00 am
DCA
-
ISP
1 stop6h 05m
Southwest
Sun 5/105:15 am
ISP
-
DCA
1 stop6h 45m
Southwest
Deal found 3/7$347
This Southwest deal was found by Cheapflights users on 3/9. 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.
Sat 4/181:05 pm
DCA
-
ISP
1 stop9h 35m
Southwest
Sun 4/195:15 am
ISP
-
DCA
1 stop6h 45m
Southwest
Deal found 3/9$383
This Southwest deal was found by Cheapflights users on 3/7. 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.
Sat 4/46:00 am
DCA
-
ISP
1 stop7h 45m
Southwest
Sat 4/115:30 am
ISP
-
DCA
1 stop5h 50m
Southwest
Deal found 3/7$398
This JetBlue deal was found by Cheapflights users on 3/8. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/236:00 am
DCA
-
ISP
1 stop5h 35m
JetBlue
Mon 7/2712:25 pm
ISP
-
DCA
1 stop7h 05m
JetBlue
Deal found 3/8$399
This Southwest deal was found by Cheapflights users on 3/8. 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.
Fri 5/224:25 pm
DCA
-
ISP
1 stop6h 05m
Southwest
Sun 5/248:00 am
ISP
-
DCA
1 stop7h 40m
Southwest
Deal found 3/8$438
This Southwest deal was found by Cheapflights users on 3/9. 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 3/246:00 am
DCA
-
ISP
1 stop7h 40m
Southwest
Sat 3/2812:15 pm
ISP
-
DCA
1 stop7h 40m
Southwest
Deal found 3/9$448
This Priceline deal was found by Cheapflights users on 3/9. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/236:00 am
DCA
-
ISP
1 stop5h 35m
JetBlue
Sun 7/2612:25 pm
ISP
-
DCA
1 stop7h 05m
JetBlue
Deal found 3/9$463
This JetBlue deal was found by Cheapflights users on 3/8. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/297:10 am
DCA
-
ISP
1 stop6h 29m
JetBlue
Sun 5/3112:25 pm
ISP
-
DCA
1 stop6h 30m
JetBlue
Deal found 3/8$478

Find 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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$327
(Southwest)

One-way from

$152
(JetBlue)

Popular in

March

Cheapest in

April

Average price

$267
Provider with most accurate pricing for Washington, D.C. Reagan-National-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Reagan-National-Islip Long Island flights.
Search Deals
From Washington, D.C. Reagan-National to Islip Long Island
Search Deals
One-way flight from Washington, D.C. Reagan-National to Islip Long Island
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($8 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 10, 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Fri 5/29

4:25 pm-10:30 pm

1 stop6h 05m

Islip Long Island

Sun 5/31

1:50 pm-10:50 pm

1 stop9h 00m

$327

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 6/13

12:00 pm-10:55 pm

2 stops10h 55m

Islip Long Island

Mon 6/15

5:20 am-12:00 pm

1 stop6h 40m

$332

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Wed 4/22

1:00 pm-10:40 pm

1 stop9h 40m

Islip Long Island

Fri 4/24

6:50 am-3:40 pm

1 stop8h 50m

$332

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Tue 4/7

6:05 am-4:35 pm

1 stop10h 30m

Islip Long Island

Wed 4/8

2:30 pm-10:25 pm

2 stops7h 55m

$338

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Fri 5/8

6:00 am-12:05 pm

1 stop6h 05m

Islip Long Island

Sun 5/10

5:15 am-12:00 pm

1 stop6h 45m

$347

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 4/18

1:05 pm-10:40 pm

1 stop9h 35m

Islip Long Island

Sun 4/19

5:15 am-12:00 pm

1 stop6h 45m

$383

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 7/23

6:00 am-11:35 am

1 stop5h 35m

Islip Long Island

Mon 7/27

12:25 pm-7:30 pm

1 stop7h 05m

$399

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Fri 5/22

4:25 pm-10:30 pm

1 stop6h 05m

Islip Long Island

Sun 5/24

8:00 am-3:40 pm

1 stop7h 40m

$438

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Tue 3/24

6:00 am-1:40 pm

1 stop7h 40m

Islip Long Island

Sun 3/29

12:20 pm-8:50 pm

1 stop8h 30m

$487
Quickest round-trip

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 4/9

6:00 am-12:05 pm

1 stop6h 05m

Islip Long Island

Thu 4/16

5:10 pm-10:50 pm

1 stop5h 40m

$524

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/9

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 March.
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-Islip, New York 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-Islip, New York flight deals on Cheapflights vs. FlightHub >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 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-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 February is currently the most expensive (average of $126). 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 6h 05m. 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 February is currently the most expensive (average of $126). 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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