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Islip

$86+ Cheap flights from District of Columbia 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 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ISP
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
1 adult, Economy
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Cheap flight deals from District of Columbia to Islip

Cheapest flights from District of Columbia to Islip
Explore the most affordable flight options available from District of Columbia to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 4, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:20 am
IAD
-
ISP
2 stops33h 53m
Frontier
Sun 3/224:34 pm
ISP
-
IAD
1 stop14h 50m
Frontier
Deal found 2/4$268
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/22:39 pm
IAD
-
ISP
1 stop9h 16m
Frontier
Mon 4/66:40 pm
ISP
-
IAD
1 stop22h 51m
Frontier
Deal found 2/3$322
This Southwest deal was found by Cheapflights users on 2/2. 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 3/47:55 am
DCA
-
ISP
1 stop6h 40m
Southwest
Wed 3/116:10 am
ISP
-
DCA
1 stop5h 50m
Southwest
Deal found 2/2$327
This Expedia deal was found by Cheapflights users on 2/4. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/62:39 pm
IAD
-
ISP
1 stop19h 09m
Frontier
Fri 3/131:42 pm
ISP
-
IAD
1 stop17h 42m
Frontier
Deal found 2/4$328
This Southwest deal was found by Cheapflights users on 2/1. 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 3/37:55 am
DCA
-
ISP
1 stop6h 40m
Southwest
Sun 3/812:20 pm
ISP
-
DCA
1 stop8h 30m
Southwest
Deal found 2/1$337
This Southwest deal was found by Cheapflights users on 2/2. 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 3/51:00 pm
DCA
-
ISP
1 stop9h 40m
Southwest
Sun 3/812:20 pm
ISP
-
DCA
1 stop8h 30m
Southwest
Deal found 2/2$342
This Kiwi.com deal was found by Cheapflights users on 2/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/62:39 pm
IAD
-
ISP
2 stops20h 31m
Multiple Airlines
Fri 3/131:42 pm
ISP
-
IAD
1 stop17h 42m
Multiple Airlines
Deal found 2/4$342
This Southwest deal was found by Cheapflights users on 2/2. 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 3/37:55 am
DCA
-
ISP
1 stop6h 40m
Southwest
Fri 3/612:15 pm
ISP
-
DCA
1 stop10h 30m
Southwest
Deal found 2/2$372
This Southwest deal was found by Cheapflights users on 2/3. 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 3/51:00 pm
DCA
-
ISP
1 stop9h 40m
Southwest
Thu 3/1212:15 pm
ISP
-
DCA
1 stop10h 30m
Southwest
Deal found 2/3$373
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/26:00 am
IAD
-
ISP
2 stops13h 51m
Multiple Airlines
Mon 4/66:40 pm
ISP
-
IAD
1 stop22h 51m
Multiple Airlines
Deal found 2/3$390
This Frontier deal was found by Cheapflights users on 2/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/510:10 am
IAD
-
ISP
1 stop26h 37m
Frontier
Sun 3/85:08 pm
ISP
-
IAD
1 stop14h 16m
Frontier
Deal found 2/2$405
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/52:10 pm
IAD
-
ISP
1 stop21h 05m
Multiple Airlines
Sun 3/85:08 pm
ISP
-
IAD
2 stops21h 10m
Multiple Airlines
Deal found 2/2$407

Find flight deals from District of Columbia to Islip

Keep the following information in mind while searching for District of Columbia to Islip flight deals. Data was last updated February 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$268
(Kiwi.com)

One-way from

$86
(Trip.com)

Popular in

October

Cheapest in

April

Average price

$186
Provider with most accurate pricing for Washington, D.C. (WAS)-New York (NYC) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-New York (NYC) flights.
Search Deals
From District of Columbia to Islip Long Island
Search Deals
One-way flight from District of Columbia to Islip Long Island
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($6 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from District of Columbia 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 February 4, 2026.
Use the filters below to find and compare flights from District of Columbia to Islip that are best for you.

Fly from

District of Columbia

Fly to

Islip

Route

Depart

Return

Price

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Wed 3/11

6:20 am-4:13 pm

2 stops33h 53m

Islip Long Island

Sun 3/22

4:34 pm-7:24 am

1 stop14h 50m

$268

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Thu 4/2

2:39 pm-11:55 pm

1 stop9h 16m

Islip Long Island

Mon 4/6

6:40 pm-5:31 pm

1 stop22h 51m

$322

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 3/7

6:05 am-1:45 pm

1 stop7h 40m

Islip Long Island

Tue 3/10

6:10 am-12:00 pm

1 stop5h 50m

$327

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Wed 3/4

7:55 am-2:35 pm

1 stop6h 40m

Islip Long Island

Wed 3/11

6:10 am-12:00 pm

1 stop5h 50m

$327

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Fri 3/6

2:39 pm-9:48 am

1 stop19h 09m

Islip Long Island

Fri 3/13

1:42 pm-7:24 am

1 stop17h 42m

$328

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Tue 3/3

7:55 am-2:35 pm

1 stop6h 40m

Islip Long Island

Sun 3/8

12:20 pm-8:50 pm

1 stop8h 30m

$337

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 3/5

1:00 pm-10:40 pm

1 stop9h 40m

Islip Long Island

Sun 3/8

12:20 pm-8:50 pm

1 stop8h 30m

$342

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Tue 3/3

7:55 am-2:35 pm

1 stop6h 40m

Islip Long Island

Fri 3/6

12:15 pm-10:55 pm

2 stops10h 40m

$372

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 3/5

1:00 pm-10:40 pm

1 stop9h 40m

Islip Long Island

Thu 3/12

12:15 pm-10:45 pm

1 stop10h 30m

$373

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Thu 4/2

6:00 am-7:51 pm

2 stops13h 51m

Islip Long Island

Mon 4/6

6:40 pm-5:31 pm

1 stop22h 51m

$390

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/2

Showing 1-10 of 35 results
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Best time to book a flight from District of Columbia to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from District of Columbia 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 District of Columbia to Islip

What is the cheapest month to book a flight from District of Columbia to Islip, New York?

Currently, April is the cheapest month in which you can book a flight from District of Columbia to Islip, New York (average of $54). Flying from District of Columbia to Islip, New York in August is currently the most expensive (average of $117). 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 DC to ISP?

Find hourly flight availability from District of Columbia 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 February 4, 2026.

When flying from District of Columbia to Islip, New York, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 5% versus a flight at noon.

Related info for your journey

Find useful and relevant information for your journey from District of Columbia 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 District of Columbia?

    If you book a flight to Islip from District of Columbia, you will be flying to Long Island, which is the city’s only airport. Islip Long Island (ISP) is located 7.2 mi from the center of Islip.

  • How long is the flight from District of Columbia to Islip, New York?

    A quick flight from District of Columbia to Islip, New York can take about 7h 40m. Frontier provides one of the quickest options available for as low as $327. The distance from District of Columbia to Islip, New York is about 248 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • Can I find deals for flights from District of Columbia to Islip that include hotel bookings?

    Yes. In addition to deals on District of Columbia to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from District of Columbia to Islip?

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

  • Can I find deals for business class flights from District of Columbia to Islip?

    Yes. Cheapflights offers flight deals from District of Columbia 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 District of Columbia to Islip, New York?

    Currently, April is the cheapest month in which you can book a flight from District of Columbia to Islip, New York (average of $54). Flying from District of Columbia to Islip, New York in August is currently the most expensive (average of $117). 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

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Alternative routes for District of Columbia to Islip

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Top airline flying from District of Columbia to Islip

Discover the top airline that operate flights from District of Columbia to Islip. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$231Average$363FlexibilityNo cancel feeOn-time63%

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