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Reagan-National

$164+ 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 4/14. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — DCA
Apr 9 — Apr 161
Thu 4/9
Thu 4/16
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 March 10, 2026.

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.
Thu 4/235:10 pm
ISP
-
DCA
1 stop5h 40m
Southwest
Thu 4/304:25 pm
DCA
-
ISP
1 stop6h 05m
Southwest
Deal found 3/9$327
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 4/176:50 am
ISP
-
DCA
1 stop8h 50m
Southwest
Sat 4/181:05 pm
DCA
-
ISP
1 stop9h 35m
Southwest
Deal found 3/7$332
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.
Thu 4/306:50 am
ISP
-
DCA
1 stop8h 50m
Southwest
Mon 5/116:00 am
DCA
-
ISP
1 stop6h 05m
Southwest
Deal found 3/6$337
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.
Tue 4/212:30 pm
ISP
-
DCA
2 stops7h 55m
Southwest
Wed 4/221:00 pm
DCA
-
ISP
1 stop9h 40m
Southwest
Deal found 3/8$338
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.
Mon 4/205:10 pm
ISP
-
DCA
1 stop5h 40m
Southwest
Tue 4/211:00 pm
DCA
-
ISP
1 stop9h 40m
Southwest
Deal found 3/8$342
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 6/512:25 pm
ISP
-
DCA
1 stop10h 07m
JetBlue
Mon 6/87:10 am
DCA
-
ISP
1 stop6h 29m
JetBlue
Deal found 3/8$344
This Southwest deal was found by Cheapflights users on 3/10. 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.
Wed 4/226:55 am
ISP
-
DCA
1 stop8h 50m
Southwest
Mon 4/276:00 am
DCA
-
ISP
1 stop6h 05m
Southwest
Deal found 3/10$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.
Wed 4/82:30 pm
ISP
-
DCA
2 stops7h 55m
Southwest
Wed 4/156:05 am
DCA
-
ISP
1 stop10h 30m
Southwest
Deal found 3/9$348
This Southwest deal was found by Cheapflights users on 3/10. 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.
Tue 5/126:55 am
ISP
-
DCA
1 stop8h 50m
Southwest
Thu 5/146:00 am
DCA
-
ISP
1 stop6h 05m
Southwest
Deal found 3/10$362
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.
Sun 4/195:15 am
ISP
-
DCA
1 stop6h 45m
Southwest
Tue 4/211:00 pm
DCA
-
ISP
1 stop9h 40m
Southwest
Deal found 3/8$367
This Southwest deal was found by Cheapflights users on 3/10. 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.
Wed 7/86:25 am
ISP
-
DCA
1 stop5h 35m
Southwest
Fri 7/105:25 pm
DCA
-
ISP
1 stop6h 15m
Southwest
Deal found 3/10$378

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 March 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$327
(Southwest)

One-way from

$164
(Southwest)

Popular in

March

Cheapest in

April

Average price

$234
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
High demand for flights, 4% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($4 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 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 March 10, 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

Thu 4/23

5:10 pm-10:50 pm

1 stop5h 40m

Washington, D.C. Reagan-National

Thu 4/30

4:25 pm-10:30 pm

1 stop6h 05m

$327

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Thu 4/30

6:50 am-3:40 pm

1 stop8h 50m

Washington, D.C. Reagan-National

Mon 5/11

6:00 am-12:05 pm

1 stop6h 05m

$337

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 4/24

5:10 pm-10:50 pm

1 stop5h 40m

Washington, D.C. Reagan-National

Mon 4/27

6:00 am-12:05 pm

1 stop6h 05m

$347

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 6/12

12:25 pm-7:30 pm

1 stop7h 05m

Washington, D.C. Reagan-National

Sun 6/14

6:00 am-11:35 am

1 stop5h 35m

$433

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 3/20

12:15 pm-10:55 pm

2 stops10h 40m

Washington, D.C. Reagan-National

Tue 3/24

6:00 am-1:40 pm

1 stop7h 40m

$483

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 6/26

3:07 pm-10:36 pm

1 stop7h 29m

Washington, D.C. Reagan-National

Sun 6/28

6:00 am-11:35 am

1 stop5h 35m

$513

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 8/21

1:15 pm-11:55 pm

2 stops10h 40m

Washington, D.C. Reagan-National

Sun 8/23

1:00 pm-11:15 pm

1 stop10h 15m

$517

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Fri 3/20

12:15 pm-10:45 pm

1 stop10h 30m

Washington, D.C. Reagan-National

Sun 3/22

7:25 am-5:15 pm

2 stops9h 50m

$629

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Mon 3/23

12:15 pm-10:55 pm

2 stops10h 40m

Washington, D.C. Reagan-National

Fri 3/27

1:00 pm-10:40 pm

1 stop9h 40m

$639
Cheapest one-way

IslipWashington, D.C.

ISP - DCA

ISPDCA

Islip Long Island

Tue 4/14

6:55 am-3:45 pm

1 stop8h 50m

$164

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

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 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 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.

Cheapflights Insights

Everything you need to know about your flight from Islip to Washington, D.C. Reagan-National Airport

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

Currently, July is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. Reagan-National Airport (average of $64). Flying from Islip, New York to Washington, D.C. Reagan-National Airport in September is currently the most expensive (average of $127). 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 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 40m. 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.

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

    Currently, July is the cheapest month in which you can book a flight from Islip, New York to Washington, D.C. Reagan-National Airport (average of $64). Flying from Islip, New York to Washington, D.C. Reagan-National Airport in September is currently the most expensive (average of $127). 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 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
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
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Fredericksburg
Largo
Bowie
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Towson
College Park

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