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Islip

$81+ Cheap flights from Washington, D.C. (WAS) 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ISP
Mar 10 — Mar 171
Tue 3/10
Tue 3/17
1 adult, Economy
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Cheap flight deals from Washington, D.C. to Islip

Cheapest flights from Washington, D.C. to Islip
Explore the most affordable flight options available from Washington, D.C. to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 8, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/155:45 am
BWI
-
ISP
1 stop10h 27m
Frontier
Thu 2/195:07 pm
ISP
-
BWI
1 stop7h 13m
Frontier
Deal found 2/7$244
This Southwest deal was found by Cheapflights users on 2/8. 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 3/109:40 pm
BWI
-
ISP
Nonstop1h 10m
Southwest
Tue 3/1712:20 pm
ISP
-
BWI
Nonstop1h 15m
Southwest
Deal found 2/8$263
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/146:55 pm
BWI
-
ISP
2 stops12h 53m
Frontier
Thu 2/195:07 pm
ISP
-
BWI
1 stop7h 13m
Frontier
Deal found 2/8$279
This Southwest deal was found by Cheapflights users on 2/7. 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 4/1710:40 am
BWI
-
ISP
Nonstop1h 10m
Southwest
Tue 4/219:00 am
ISP
-
BWI
Nonstop1h 20m
Southwest
Deal found 2/7$281
This Kiwi.com deal was found by Cheapflights users on 2/5. 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.
Mon 2/166:10 am
BWI
-
ISP
1 stop12h 54m
Frontier
Fri 3/66:00 am
ISP
-
BWI
1 stop9h 36m
Frontier
Deal found 2/5$283
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/155:45 am
BWI
-
ISP
1 stop10h 27m
Multiple Airlines
Thu 2/1911:55 am
ISP
-
BWI
2 stops12h 25m
Multiple Airlines
Deal found 2/7$284
This Kiwi.com deal was found by Cheapflights users on 2/5. 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.
Mon 2/166:10 am
BWI
-
ISP
1 stop12h 54m
Multiple Airlines
Fri 3/62:31 pm
ISP
-
BWI
2 stops25h 27m
Multiple Airlines
Deal found 2/5$297
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 2/135:45 am
BWI
-
ISP
1 stop13h 29m
Frontier
Mon 3/910:58 am
ISP
-
BWI
1 stop21h 55m
Frontier
Deal found 2/5$302
This Southwest deal was found by Cheapflights users on 2/7. 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.
Thu 3/1210:30 am
BWI
-
ISP
Nonstop1h 10m
Southwest
Sun 3/155:55 pm
ISP
-
BWI
Nonstop1h 20m
Southwest
Deal found 2/7$310
This Kiwi.com deal was found by Cheapflights users on 2/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/55:45 am
BWI
-
ISP
1 stop10h 37m
Multiple Airlines
Sun 3/87:26 pm
ISP
-
BWI
2 stops29h 17m
Multiple Airlines
Deal found 2/8$323
This Southwest deal was found by Cheapflights users on 2/6. 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.
Fri 5/296:00 am
DCA
-
ISP
1 stop6h 05m
Southwest
Mon 6/15:10 pm
ISP
-
DCA
1 stop5h 40m
Southwest
Deal found 2/6$327
This Southwest deal was found by Cheapflights users on 2/8. 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 3/106:00 am
DCA
-
ISP
1 stop7h 40m
Southwest
Tue 3/176:10 am
ISP
-
DCA
1 stop5h 50m
Southwest
Deal found 2/8$337

Find flight deals from Washington, D.C. to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) 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 February 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$263
(Southwest)

One-way from

$81
(Trip.com)

Popular in

February

Cheapest in

April

Average price

$655

Good round-trip deal

$339 or less

Good one-way deal

$180 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Islip Long Island flights.
Search Deals
From Washington, D.C. (WAS) to Islip Long Island
Search Deals
One-way flight from Washington, D.C. (WAS) to Islip Long Island
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($1 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. (WAS) to Islip Long Island.
Search Deals
Price to beat on a one-way flight from Washington, D.C. (WAS) to Islip Long Island.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. 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 8, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Islip that are best for you.

Fly from

Washington, D.C.

Fly to

Islip

Route

Depart

Return

Price

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Tue 3/10

9:40 pm-10:50 pm

Nonstop1h 10m

Islip Long Island

Tue 3/17

12:20 pm-1:35 pm

Nonstop1h 15m

$263

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Mon 2/23

6:08 pm-8:40 am

2 stops38h 32m

Islip Long Island

Fri 2/27

8:33 am-5:04 pm

1 stop8h 31m

$279

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Fri 4/17

10:40 am-11:50 am

Nonstop1h 10m

Islip Long Island

Tue 4/21

9:00 am-10:20 am

Nonstop1h 20m

$281

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Thu 3/12

10:30 am-11:40 am

Nonstop1h 10m

Islip Long Island

Sun 3/15

5:55 pm-7:15 pm

Nonstop1h 20m

$310

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Thu 3/19

10:45 pm-11:55 pm

Nonstop1h 10m

Islip Long Island

Sun 3/22

11:45 am-1:05 pm

Nonstop1h 20m

$310

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Fri 3/13

10:45 pm-11:55 pm

Nonstop1h 10m

Islip Long Island

Sun 3/15

5:40 am-7:00 am

Nonstop1h 20m

$310

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Thu 3/5

4:10 pm-5:20 pm

Nonstop1h 10m

Islip Long Island

Sun 3/8

5:15 am-6:35 am

Nonstop1h 20m

$321

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Tue 3/10

6:00 am-1:40 pm

1 stop7h 40m

Islip Long Island

Tue 3/17

6:10 am-12:00 pm

1 stop5h 50m

$337

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Fri 5/29

7:10 pm-8:25 pm

Nonstop1h 15m

Islip Long Island

Mon 6/1

8:35 am-9:55 am

Nonstop1h 20m

$339

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Sat 5/23

10:25 am-11:35 am

Nonstop1h 10m

Islip Long Island

Sat 5/23

4:40 pm-6:00 pm

Nonstop1h 20m

$339

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/8

Showing 1-10 of 43 results
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Compare providers for flights from Washington, D.C. to Islip

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 Washington, D.C. to Islip in February.
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 Washington, D.C.-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Islip, New York flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C.-Islip, New York 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 Washington, D.C.-Islip, New York 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 Washington, D.C. to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Washington, D.C. 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. to Islip

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

Currently, April is the cheapest month in which you can book a flight from Washington, D.C. to Islip, New York (average of $54). Flying from Washington, D.C. 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 WAS to ISP?

Find hourly flight availability from Washington, D.C. 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 8, 2026.

When flying from Washington, D.C. 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.

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 February 8, 2026.
Read through reviews of airlines operating flights from Washington, D.C. to Islip, such as Southwest. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,282 reviews

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,282 reviews
Southwest
8.0
Very good
4,282 reviews

Overall

8.0

Crew

8.6

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. 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.?

    Located just 7.2 mi from the city center, Islip Long Island is the airport most travelers will use when flying to Islip from Washington, D.C.. Booking flights from Washington, D.C. to Long Island (ISP) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. from 1 airline.

  • How long is the flight from Washington, D.C. to Islip, New York?

    For as low as $263, Southwest can have you in Islip, New York from Washington, D.C. in 1h 10m. There are 219 mi between Washington, D.C. and Islip, New York. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Washington, D.C. to Islip, New York?

    When deciding which route to take from Washington, D.C. to Islip, New York consider Baltimore/Washington - Islip Long Island, Washington, D.C. Reagan-National - Islip Long Island or Washington, D.C. Dulles Intl - Islip Long Island as they are the most popular.

  • Can I find deals for flights from Washington, D.C. to Islip that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Islip flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Islip?

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

  • Can I find deals for business class flights from Washington, D.C. to Islip?

    Yes. Cheapflights offers flight deals from Washington, D.C. 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. to Islip, New York?

    Currently, April is the cheapest month in which you can book a flight from Washington, D.C. to Islip, New York (average of $54). Flying from Washington, D.C. 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?

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Top airline flying from Washington, D.C. to Islip

Discover the top airline that operate flights from Washington, D.C. 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 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$231Average$363FlexibilityNo cancel feeOn-time63%

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