HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$142+ 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 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
DCA — ISP
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Reagan-National to Islip with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 July 28, 2025.

Round-trip from

$322
(Southwest)

One-way from

$142
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$217
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. 19% potential increase in price ($50 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

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 July 28, 2025.

This Southwest deal was found by Cheapflights users on 7/27. 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 8/266:55 amDCA - ISP
2 stops8h 20mSouthwest
Tue 9/24:00 pmISP - DCA
1 stop6h 00mSouthwest
Deal found 7/27$322
This Trip.com deal was found by Cheapflights users on 7/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2310:10 amDCA - ISP
1 stop25h 31mJetBlue
Sat 8/3011:40 amISP - DCA
1 stop9h 19mJetBlue
Deal found 7/26$583
This United deal was found by Cheapflights users on 7/27. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/2410:13 amDCA - ISP
2 stops9h 48mMultiple Airlines
Mon 8/254:33 pmISP - DCA
2 stops19h 49mMultiple Airlines
Deal found 7/27$785

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 July 28, 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 8/26

6:55 am-3:15 pm

2 stops8h 20m

Islip Long Island

Tue 9/2

4:00 pm-10:00 pm

1 stop6h 00m

$322

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 8/23

10:10 am-11:41 am

1 stop25h 31m

Islip Long Island

Sat 8/30

11:40 am-8:59 pm

1 stop9h 19m

$583

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sun 8/24

10:13 am-8:01 pm

2 stops9h 48m

Islip Long Island

Mon 8/25

4:33 pm-12:22 pm

2 stops19h 49m

$785

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Wed 9/10

4:00 pm-3:23 pm

1 stop23h 23m

$142

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Tue 8/26

6:55 am-3:15 pm

2 stops8h 20m

$169

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

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, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Islip, New York (average of $108). Flying from Washington, D.C. Reagan-National Airport to Islip, New York 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 July 28, 2025.

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

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Islip. Reviews last updated July 28, 2025.
See what other customers who have flown with Southwest and JetBlue from Washington, D.C. Reagan-National Airport to Islip have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,237 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,237 reviews
Southwest
8.0
Very good
4,237 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
JetBlue
7.3
Good
2,914 reviews
Southwest
8.0
Very good
4,237 reviews

Comfort

8.0

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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.

  • What are the cheapest airlines flying from Washington, D.C. Reagan-National Airport to Islip, New York round-trip?

    Cheapflights users have booked flights from Washington, D.C. Reagan-National Airport to Islip, New York round-trip from $322. Another airline that can offer you cheap pricing is JetBlue.

  • 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, January is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Islip, New York (average of $108). Flying from Washington, D.C. Reagan-National Airport to Islip, New York 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?

Book flights to Islip if you plan to visit one of these locations
Riverhead
Southampton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Reagan-National to Islip

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to John F Kennedy Intl flights
Dulles Intl to LaGuardia flights
Reagan-National to John F Kennedy Intl flights
Baltimore to LaGuardia flights
Dulles Intl to Newark flights
Baltimore to Newark flights
Reagan-National to LaGuardia flights
Reagan-National to Newark flights
Dulles Intl to Albany flights
Dulles Intl to Buffalo flights
Reagan-National to Albany flights
Reagan-National to Buffalo flights
Baltimore to Albany flights
Baltimore to John F Kennedy Intl flights
Baltimore to Buffalo flights
Reagan-National to Rochester flights
Dulles Intl to Rochester flights
Dulles Intl to Syracuse flights
Baltimore to Rochester flights
Reagan-National to Syracuse flights
Dulles Intl to White Plains flights
Baltimore to Syracuse flights
Baltimore to White Plains flights
Reagan-National to White Plains flights
Dulles Intl to Ithaca flights
Baltimore to Islip flights
Reagan-National to Ithaca flights
Dulles Intl to Islip flights
Dulles Intl to Plattsburgh flights
Baltimore to Stewart flights
Baltimore to Ithaca flights
Reagan-National to Saranac Lake flights
Dulles Intl to Stewart flights
Dulles Intl to Saranac Lake flights
Reagan-National to Rutland flights
Baltimore to Plattsburgh flights
Dulles Intl to Rutland flights
Reagan-National to Binghamton flights
Reagan-National to Elmira flights
Dulles Intl to Elmira flights
Dulles Intl to Watertown flights
Baltimore to Binghamton flights
Dulles Intl to Binghamton flights
Baltimore to Elmira flights
Reagan-National to Watertown flights
Baltimore to Rutland flights
Baltimore to Watertown flights
Baltimore to Saranac Lake flights
Reagan-National to Stewart flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.