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Islip

$60+ 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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ISP
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
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 December 23, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/20. 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.
Tue 12/309:09 pmBWI - ISP
1 stop19h 28mMultiple Airlines
Thu 1/111:40 amISP - BWI
2 stops12h 09mMultiple Airlines
Deal found 12/20$412
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/269:09 pmBWI - ISP
1 stop20h 46mMultiple Airlines
Tue 12/3012:20 pmISP - BWI
1 stop19h 02mMultiple Airlines
Deal found 12/20$502
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 12/2710:00 pmBWI - ISP
1 stop15h 09mMultiple Airlines
Wed 12/318:21 pmISP - BWI
2 stops27h 28mMultiple Airlines
Deal found 12/22$506
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 12/2710:00 pmBWI - ISP
1 stop15h 09mFrontier
Sat 1/37:30 pmISP - BWI
1 stop11h 48mFrontier
Deal found 12/22$527
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 12/269:58 pmIAD - ISP
1 stop19h 57mFrontier
Fri 1/28:35 pmISP - IAD
2 stops21h 41mFrontier
Deal found 12/21$529
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 12/2710:00 pmBWI - ISP
1 stop15h 09mFrontier
Wed 12/315:27 pmISP - BWI
1 stop13h 55mFrontier
Deal found 12/22$540
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 12/2210:00 pmBWI - ISP
1 stop13h 25mMultiple Airlines
Mon 12/294:40 pmISP - BWI
1 stop16h 55mMultiple Airlines
Deal found 12/21$572
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/269:58 pmIAD - ISP
1 stop19h 57mFrontier
Tue 12/3012:20 pmISP - IAD
1 stop8h 43mFrontier
Deal found 12/20$575
This Southwest deal was found by Cheapflights users on 12/20. 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 12/3010:45 amBWI - ISP
Nonstop1h 10mSouthwest
Thu 1/13:55 pmISP - BWI
Nonstop1h 15mSouthwest
Deal found 12/20$593
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 12/2710:15 pmIAD - ISP
1 stop14h 54mFrontier
Wed 12/315:27 pmISP - IAD
2 stops18h 11mFrontier
Deal found 12/22$601
This Southwest deal was found by Cheapflights users on 12/22. 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.
Sat 12/277:40 pmBWI - ISP
Nonstop1h 10mSouthwest
Wed 12/313:55 pmISP - BWI
Nonstop1h 15mSouthwest
Deal found 12/22$649
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 12/222:32 pmIAD - ISP
2 stops48h 38mMultiple Airlines
Mon 12/292:04 pmISP - IAD
1 stop6h 59mMultiple Airlines
Deal found 12/21$672

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 December 23, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$142
(Kiwi.com)

One-way from

$60
(Trip.com)

Popular in

December

Cheapest in

April

Average price

$626

Good round-trip deal

$561 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. 24% potential increase in price ($138 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip 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 December 23, 2025.
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

Mon 1/12

6:00 am-7:51 pm

1 stop13h 51m

Islip Long Island

Wed 1/14

8:00 am-10:36 pm

1 stop14h 36m

$142

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Mon 1/12

6:00 am-7:51 pm

1 stop13h 51m

Islip Long Island

Wed 1/14

11:50 am-7:23 am

2 stops19h 33m

$173

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Tue 1/6

11:45 am-11:10 am

2 stops23h 25m

Islip Long Island

Sat 1/10

7:56 pm-12:07 pm

1 stop16h 11m

$190

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Fri 1/30

11:30 am-8:47 pm

1 stop9h 17m

Islip Long Island

Sun 2/1

9:25 am-10:27 am

2 stops25h 02m

$195

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Fri 1/16

11:15 am-8:09 pm

1 stop8h 54m

Islip Long Island

Sun 1/18

8:45 pm-7:23 am

1 stop10h 38m

$212

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sun 1/4

9:58 pm-1:09 pm

1 stop15h 11m

Islip Long Island

Thu 1/8

8:40 pm-7:55 am

1 stop11h 15m

$217

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Fri 1/16

9:58 pm-11:10 am

2 stops13h 12m

Islip Long Island

Sun 1/18

9:52 am-9:03 pm

1 stop11h 11m

$228

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Sun 1/18

10:05 am-11:59 pm

2 stops13h 54m

Islip Long Island

Sun 1/25

7:53 pm-6:01 pm

1 stop22h 08m

$253

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Mon 1/12

10:45 am-11:55 am

Nonstop1h 10m

Islip Long Island

Wed 1/14

3:45 pm-5:05 pm

Nonstop1h 20m

$272

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Thu 1/29

3:10 pm-4:15 pm

Nonstop1h 05m

Islip Long Island

Tue 2/3

3:45 pm-5:05 pm

Nonstop1h 20m

$272

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 44 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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Washington, D.C.-Islip, New York flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 January is currently the most expensive (average of $123). 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 December 23, 2025.

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 36% 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 December 23, 2025.
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
4,253 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

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
4,253 reviews
Southwest
8.0
Very good
4,253 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

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 $327, Frontier can have you in Islip, New York from Washington, D.C. in 6h 40m. There are 248 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 January is currently the most expensive (average of $123). 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 Washington, D.C. to Islip

See prices for flight routes from nearby airports that may be better suited for you.
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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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$231Average$381FlexibilityNo cancel feeOn-time63%

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