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Reagan-National

$174+ Cheap flights from Islip, NY (ISP) 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 5/31. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — DCA
May 27 — Jun 31
Wed 5/27
Wed 6/3
1 adult, Economy
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Cheap flight deals from Islip to Reagan-National

Cheapest flights from Islip to Reagan-National
Explore the most affordable flight options available from Islip to Reagan-National. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 27, 2026.

This Southwest deal was found by Cheapflights users on 4/23. 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 6/65:35 am
ISP
-
DCA
1 stop5h 35m
Southwest
Tue 6/94:40 pm
DCA
-
ISP
1 stop5h 55m
Southwest
Deal found 4/23$320
This Southwest deal was found by Cheapflights users on 4/27. 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.
Tue 6/96:25 am
ISP
-
DCA
1 stop5h 35m
Southwest
Wed 6/104:40 pm
DCA
-
ISP
1 stop5h 55m
Southwest
Deal found 4/27$347
This Southwest deal was found by Cheapflights users on 4/26. 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.
Tue 5/266:55 am
ISP
-
DCA
1 stop8h 50m
Southwest
Tue 6/21:00 pm
DCA
-
ISP
1 stop9h 40m
Southwest
Deal found 4/26$352
This Southwest deal was found by Cheapflights users on 4/23. 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 7/175:20 am
ISP
-
DCA
1 stop6h 40m
Southwest
Tue 7/214:40 pm
DCA
-
ISP
1 stop5h 55m
Southwest
Deal found 4/23$357
This Southwest deal was found by Cheapflights users on 4/27. 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.
Fri 10/166:50 am
ISP
-
DCA
1 stop9h 05m
Southwest
Sun 10/181:00 pm
DCA
-
ISP
1 stop10h 35m
Southwest
Deal found 4/27$372
This Southwest deal was found by Cheapflights users on 4/23. 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 5/86:50 am
ISP
-
DCA
1 stop8h 50m
Southwest
Tue 5/121:00 pm
DCA
-
ISP
1 stop9h 40m
Southwest
Deal found 4/23$375
This Southwest deal was found by Cheapflights users on 4/24. 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 5/165:30 am
ISP
-
DCA
1 stop5h 50m
Southwest
Mon 5/184:25 pm
DCA
-
ISP
1 stop6h 05m
Southwest
Deal found 4/24$387
This Southwest deal was found by Cheapflights users on 4/23. 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 5/165:30 am
ISP
-
DCA
1 stop5h 50m
Southwest
Wed 5/206:05 am
DCA
-
ISP
1 stop10h 30m
Southwest
Deal found 4/23$392
This Southwest deal was found by Cheapflights users on 4/24. 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.
Sun 6/146:45 am
ISP
-
DCA
1 stop9h 05m
Southwest
Mon 6/155:25 pm
DCA
-
ISP
1 stop6h 15m
Southwest
Deal found 4/24$403
This Southwest deal was found by Cheapflights users on 4/23. 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 5/235:30 am
ISP
-
DCA
1 stop5h 50m
Southwest
Mon 5/256:00 am
DCA
-
ISP
1 stop6h 05m
Southwest
Deal found 4/23$417
This Southwest deal was found by Cheapflights users on 4/23. 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.
Sun 5/105:15 am
ISP
-
DCA
1 stop6h 45m
Southwest
Fri 5/156:00 am
DCA
-
ISP
1 stop6h 05m
Southwest
Deal found 4/23$418

Find flight deals from Islip to Reagan-National

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) 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 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$320
(Southwest)

One-way from

$174
(Southwest)

Popular in

March

Cheapest in

February

Average price

$315
Provider with most accurate pricing for Islip Long Island-Washington, D.C. Reagan-National flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-Washington, D.C. Reagan-National flights.
Search Deals
From Islip Long Island to Washington, D.C. Reagan-National
Search Deals
One-way flight from Islip Long Island to Washington, D.C. Reagan-National
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($58 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($11 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 Islip 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 27, 2026.
Use the filters below to find and compare flights from Islip to Washington, D.C. Reagan-National Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 6/9

6:25 am-12:00 pm

1 stop5h 35m

Washington, D.C. Reagan-National

Wed 6/10

4:40 pm-10:35 pm

1 stop5h 55m

$347

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 9/18

6:45 am-3:30 pm

1 stop8h 45m

Washington, D.C. Reagan-National

Mon 9/21

6:00 am-11:55 am

1 stop5h 55m

$347

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 5/26

6:55 am-3:45 pm

1 stop8h 50m

Washington, D.C. Reagan-National

Tue 6/2

1:00 pm-10:40 pm

1 stop9h 40m

$352

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 7/17

5:20 am-12:00 pm

1 stop6h 40m

Washington, D.C. Reagan-National

Tue 7/21

4:40 pm-10:35 pm

1 stop5h 55m

$357

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 5/8

6:50 am-3:40 pm

1 stop8h 50m

Washington, D.C. Reagan-National

Tue 5/12

1:00 pm-10:40 pm

1 stop9h 40m

$375

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sun 6/14

6:45 am-3:50 pm

1 stop9h 05m

Washington, D.C. Reagan-National

Mon 6/15

5:25 pm-11:40 pm

1 stop6h 15m

$403

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sun 5/10

5:15 am-12:00 pm

1 stop6h 45m

Washington, D.C. Reagan-National

Fri 5/15

6:00 am-12:05 pm

1 stop6h 05m

$418

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Sat 5/23

12:00 pm-6:59 pm

1 stop6h 59m

Washington, D.C. Reagan-National

Tue 6/2

7:10 am-1:39 pm

1 stop6h 29m

$458

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Wed 5/20

6:55 am-3:45 pm

1 stop8h 50m

Washington, D.C. Reagan-National

Fri 5/22

6:00 am-12:05 pm

1 stop6h 05m

$458

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 5/22

5:10 pm-10:50 pm

1 stop5h 40m

Washington, D.C. Reagan-National

Mon 5/25

6:00 am-12:05 pm

1 stop6h 05m

$467

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/23

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

Compare providers for flights from Islip 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 Islip 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 Islip, New York-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 Islip, New York-Washington, D.C. Reagan-National Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-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 Islip, New York-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 Islip, New York-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 Islip to Reagan-National

Have a flexible travel schedule? Discover the best time to fly to Reagan-National from Islip 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.

Related info for your journey

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

    Islip Long Island (ISP) is the airport you will fly out of if you book a flight from Islip to Washington, D.C. Reagan-National. You should not have trouble finding flights to Washington, D.C. Reagan-National from Long Island; 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 0 airlines have flights from the Islip airport to Washington, D.C. Reagan-National. It is only a 7.2 mi journey to Long Island (ISP) from Islip’s city center.

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

    Departing from Islip, New York to Washington, D.C. Reagan-National Airport will take you 5h 35m. The distance between Islip, New York and Washington, D.C. Reagan-National Airport is about 248 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip 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.

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
Silver Spring
Herndon
Rockville
Hyattsville
Manassas
Fredericksburg
Woodbridge
Hanover
Laurel
Largo
Upper Marlboro
Waldorf
Clinton
Hunt Valley
Cordova

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