$89 Cheap Flights from Washington (DCA) to Islip (ISP)

View $89 flight on Wed, Sep 3, 2025Opens in a new window

Popular airlines from Ronald Reagan Washington National Airport (DCA) to MacArthur Airport (ISP)

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Cheap Flights from Washington to Islip (DCA-ISP)

Prices were available within the past 7 days and start at $89 for one-way flights and $177 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Wed, Sep 17 - Mon, Sep 22
DCA
Washington
ISP
Islip
$177 Roundtrip, found 2 days ago
$177
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Wed, Sep 17 from Washington to Islip, returning Mon, Sep 22, priced at $177 found 2 days ago
Southwest Airlines
Thu, Aug 14 - Mon, Aug 18
DCA
Washington
ISP
Islip
$182 Roundtrip, found 4 days ago
$182
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Thu, Aug 14 from Washington to Islip, returning Mon, Aug 18, priced at $182 found 4 days ago
Southwest Airlines
Tue, Sep 9 - Wed, Sep 10
DCA
Washington
ISP
Islip
$187 Roundtrip, found 6 days ago
$187
Roundtrip
found 6 days ago
Select Southwest Airlines flight, departing Tue, Sep 9 from Washington to Islip, returning Wed, Sep 10, priced at $187 found 6 days ago
Southwest Airlines
Tue, Sep 9 - Wed, Sep 10
DCA
Washington
ISP
Islip
$219 Roundtrip, found 6 days ago
$219
Roundtrip
found 6 days ago
Select Southwest Airlines flight, departing Tue, Sep 9 from Washington to Islip, returning Wed, Sep 10, priced at $219 found 6 days ago
Southwest Airlines
Tue, Sep 9 - Wed, Sep 10
DCA
Washington
ISP
Islip
$224 Roundtrip, found 6 days ago
$224
Roundtrip
found 6 days ago
Select Southwest Airlines flight, departing Tue, Sep 9 from Washington to Islip, returning Wed, Sep 10, priced at $224 found 6 days ago
Southwest Airlines
Wed, Sep 17 - Mon, Sep 22
DCA
Washington
ISP
Islip
$237 Roundtrip, found 2 days ago
$237
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Wed, Sep 17 from Washington to Islip, returning Mon, Sep 22, priced at $237 found 2 days ago
Southwest Airlines
Sun, Aug 24 - Wed, Aug 27
DCA
Washington
ISP
Islip
$242 Roundtrip, found 4 days ago
$242
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Sun, Aug 24 from Washington to Islip, returning Wed, Aug 27, priced at $242 found 4 days ago
Southwest Airlines
Thu, Aug 14 - Mon, Aug 18
DCA
Washington
ISP
Islip
$242 Roundtrip, found 4 days ago
$242
Roundtrip
found 4 days ago
Select Southwest Airlines flight, departing Thu, Aug 14 from Washington to Islip, returning Mon, Aug 18, priced at $242 found 4 days ago
Southwest Airlines
Tue, Aug 5 - Fri, Aug 8
DCA
Washington
ISP
Islip
$247 Roundtrip, found 1 day ago
$247
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Tue, Aug 5 from Washington to Islip, returning Fri, Aug 8, priced at $247 found 1 day ago
JetBlue Airways
Tue, Sep 30 - Mon, Oct 13
DCA
Washington
ISP
Islip
$273 Roundtrip, found 4 hours ago
$273
Roundtrip
found 4 hours ago
Select JetBlue Airways flight, departing Tue, Sep 30 from Washington to Islip, returning Mon, Oct 13, priced at $273 found 4 hours ago
Flights from Washington (DCA) to Islip (ISP)
Origin airport
Ronald Reagan Washington National
Destination airport
MacArthur
Airlines serving
JetBlue Airways, Southwest Airlines
Roundtrip price
$176
Distance
248 mi

Washington to Islip Flights

The cheapest times to fly from Washington to Islip

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Islip are during the month of September. You can find some of the cheapest flights from Washington to Islip with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Islip

Sunday is one of the best days to book for cheap flights from Washington to Islip: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Islip

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Islip in 2025. You can also book with separate airlines for your outbound and return journeys, from $89 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Islip flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Islip airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Ronald Reagan Washington National Airport (DCA) to MacArthur Airport (ISP) cost?
Discover the latest flight deals from DCA to ISP by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from DCA to ISP?
The cheapest flights from DCA to ISP are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from DCA to ISP?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from DCA to ISP. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Ronald Reagan Washington National Airport (DCA) to MacArthur Airport (ISP)?
You'll have to take a flight with a layover if you're traveling from Ronald Reagan Washington National Airport (DCA) to MacArthur Airport (ISP). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from DCA to ISP?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary based on a number of factors, such as the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Ronald Reagan Washington National Airport (DCA) to MacArthur Airport (ISP)?
To avoid possible delays on the Ronald Reagan Washington National Airport (DCA) to MacArthur Airport (ISP) route, fly before 3 PM. Later flights have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Islip from Ronald Reagan Washington National Airport (DCA)?
You can arrive at any one of these Islip airports after your direct flight from Ronald Reagan Washington National Airport (DCA):

  • LaGuardia Airport (LGA)
  • John F. Kennedy Intl. Airport (JFK)
  • Westchester County Airport (HPN)

Is it cheaper to buy a plane ticket from Ronald Reagan Washington National Airport (DCA) to MacArthur Airport (ISP) last-minute?
Booking your ticket from DCA to ISP just before your getaway is generally more expensive. However, if there's some wiggle room with your departure times and dates, you could land a cheap last-minute fare.
Is it cheaper to book a DCA to ISP flight and hotel package?
Compared with arranging hotels and flights separately, booking a DCA to ISP flight and hotel package with Expedia could result in significant savings. Better still, having everything in one place takes the hassle out of planning your trip. Simply secure your flights and select from our wide range of stays, then customize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Ronald Reagan Washington National Airport (DCA) to MacArthur Airport (ISP)?
In most cases, you can cancel or modify your DCA to ISP flight. However, additional charges may apply, especially if you booked over 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you want further information, head to our Customer Service portal.

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*Available to One Key members.