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Islip

$83+ Cheap flights from District of Columbia to Islip (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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ISP
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
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Cheap 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 September 16, 2025.

Round-trip from

$232
(Trip.com)

One-way from

$83
(Priceline)

Popular in

December

Cheapest in

April

Average price

$189
From District of Columbia to Islip Long Island
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One-way flight from District of Columbia to Islip Long Island
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Highest demand for flights based on searches. 21% potential increase in price ($57 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 16, 2025.

This Frontier deal was found by Cheapflights users on 9/14. 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 9/188:59 pmIAD - ISP
1 stop12h 05mFrontier
Fri 9/269:49 amISP - IAD
1 stop10h 20mFrontier
Deal found 9/14$203
This Trip.com deal was found by Cheapflights users on 9/14. 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.
Fri 9/267:14 pmIAD - ISP
1 stop15h 41mFrontier
Sun 9/289:49 amISP - IAD
1 stop11h 30mFrontier
Deal found 9/14$232
This Frontier deal was found by Cheapflights users on 9/14. 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.
Mon 9/221:55 pmIAD - ISP
2 stops20h 45mFrontier
Thu 9/2511:40 amISP - IAD
1 stop6h 44mFrontier
Deal found 9/14$240
This Frontier deal was found by Cheapflights users on 9/14. 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 10/91:07 pmIAD - ISP
1 stop19h 57mFrontier
Mon 10/139:49 amISP - IAD
1 stop8h 56mFrontier
Deal found 9/14$245
This Frontier deal was found by Cheapflights users on 9/15. 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 9/188:59 pmIAD - ISP
1 stop12h 05mFrontier
Sun 9/219:49 amISP - IAD
1 stop11h 30mFrontier
Deal found 9/15$252
This Trip.com deal was found by Cheapflights users on 9/14. 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.
Fri 9/199:09 pmIAD - ISP
1 stop19h 14mFrontier
Sun 9/215:12 pmISP - IAD
1 stop26h 57mFrontier
Deal found 9/14$259
This Frontier deal was found by Cheapflights users on 9/14. 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 9/181:55 pmIAD - ISP
2 stops19h 09mFrontier
Sun 9/289:49 amISP - IAD
1 stop11h 30mFrontier
Deal found 9/14$263
This Trip.com deal was found by Cheapflights users on 9/14. 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.
Sun 9/217:09 pmIAD - ISP
1 stop15h 31mFrontier
Fri 9/265:05 pmISP - IAD
1 stop25h 19mFrontier
Deal found 9/14$265
This Frontier deal was found by Cheapflights users on 9/15. 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 10/94:40 pmIAD - ISP
2 stops16h 24mFrontier
Tue 10/1410:39 amISP - IAD
2 stops9h 07mFrontier
Deal found 9/15$270
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Sun 10/127:27 pmIAD - ISP
1 stop15h 10mFrontier
Sun 10/199:47 pmISP - IAD
2 stops17h 52mFrontier
Deal found 9/14$286
This Frontier deal was found by Cheapflights users on 9/14. 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.
Mon 9/151:55 pmIAD - ISP
2 stops20h 45mFrontier
Thu 9/2511:40 amISP - IAD
1 stop6h 44mFrontier
Deal found 9/14$288
This Southwest deal was found by Cheapflights users on 9/15. 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 10/156:55 amDCA - ISP
1 stop9h 25mSouthwest
Wed 10/221:10 pmISP - DCA
1 stop9h 45mSouthwest
Deal found 9/15$338

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 September 16, 2025.
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

Fri 9/26

7:14 pm-10:55 am

1 stop15h 41m

Islip Long Island

Sun 9/28

9:49 am-9:19 pm

1 stop11h 30m

$232

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Thu 10/9

1:07 pm-9:04 am

1 stop19h 57m

Islip Long Island

Mon 10/13

9:49 am-6:45 pm

1 stop8h 56m

$245

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sat 10/11

4:22 pm-8:59 am

2 stops16h 37m

Islip Long Island

Tue 10/14

10:39 am-7:46 pm

2 stops9h 07m

$270

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Tue 10/21

9:00 am-8:42 pm

2 stops11h 42m

Islip Long Island

Fri 10/24

4:58 pm-8:53 pm

1 stop27h 55m

$302

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Thu 10/9

8:02 pm-10:37 am

1 stop14h 35m

Islip Long Island

Tue 10/14

9:37 pm-7:46 pm

2 stops22h 09m

$306

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Thu 1/8

2:10 pm-11:15 am

1 stop21h 05m

Islip Long Island

Sun 1/11

12:00 pm-8:06 pm

1 stop8h 06m

$314

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Fri 11/7

5:34 pm-10:37 am

2 stops17h 03m

Islip Long Island

Mon 11/10

9:54 am-12:11 am

2 stops14h 17m

$317

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 1/8

7:55 am-2:35 pm

1 stop6h 40m

Islip Long Island

Mon 1/12

9:15 am-3:45 pm

1 stop6h 30m

$327

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Thu 1/8

7:55 am-2:35 pm

1 stop6h 40m

Islip Long Island

Sun 1/11

5:00 pm-10:55 pm

1 stop5h 55m

$327

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Wed 10/29

7:25 am-4:20 pm

2 stops8h 55m

Islip Long Island

Fri 10/31

6:40 am-4:00 pm

1 stop9h 20m

$348

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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?

Currently, January is the cheapest month in which you can book a flight from District of Columbia to Islip (average of $108). Flying from District of Columbia to Islip 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 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 September 16, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from District of Columbia to Islip as you normally would.

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?

    Airlines like Frontier and Southwest fly from District of Columbia to Islip in about 6h 40m. The time it takes to get you to your destination can typically vary by up to 9h 01m. The distance between District of Columbia and Islip is about 248 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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?

    Currently, January is the cheapest month in which you can book a flight from District of Columbia to Islip (average of $108). Flying from District of Columbia to Islip 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

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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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$233Average$358FlexibilityNo cancel feeOn-time63%

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