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$88+ 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 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ISP
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap 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 July 30, 2025.

Round-trip from

$177
(Southwest)

One-way from

$88
(Cheapflightsfares)

Popular in

January

Cheapest in

April

Average price

$368

Good round-trip deal

$309 or less

Good one-way deal

$248 or less
From Washington, D.C. (WAS) to Islip Long Island
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One-way flight from Washington, D.C. (WAS) to Islip Long Island
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Highest demand for flights based on searches. 13% potential increase in price ($63 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Washington, D.C. (WAS) to Islip Long Island.
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Price to beat on a one-way flight from Washington, D.C. (WAS) to Islip Long Island.
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Find 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 July 30, 2025.

This Southwest deal was found by Cheapflights users on 7/29. 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 10/1811:00 amBWI - ISP
Nonstop1h 10mSouthwest
Tue 10/2111:40 amISP - BWI
Nonstop1h 15mSouthwest
Deal found 7/29$177
This FlightHub deal was found by Cheapflights users on 7/28. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:14 pmIAD - ISP
1 stop15h 26mFrontier
Sun 9/145:12 pmISP - IAD
1 stop26h 57mFrontier
Deal found 7/28$195
This Expedia deal was found by Cheapflights users on 7/29. 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.
Mon 9/86:19 amDCA - ISP
2 stops9h 04mJetBlue
Wed 9/1011:35 amISP - DCA
1 stop9h 19mJetBlue
Deal found 7/29$299
This Southwest deal was found by Cheapflights users on 7/28. 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 9/136:55 amDCA - ISP
2 stops8h 10mSouthwest
Sun 9/141:55 pmISP - DCA
2 stops8h 50mSouthwest
Deal found 7/28$303
This Mytrip deal was found by Cheapflights users on 7/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/25:45 amBWI - ISP
3 stops32h 00mMultiple Airlines
Sun 10/511:40 amISP - BWI
3 stops22h 18mMultiple Airlines
Deal found 7/28$513
This United deal was found by Cheapflights users on 7/29. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/185:16 pmIAD - ISP
1 stop17h 42mMultiple Airlines
Tue 10/2111:53 amISP - IAD
1 stop23h 21mMultiple Airlines
Deal found 7/29$714
This United deal was found by Cheapflights users on 7/29. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/89:00 amDCA - ISP
2 stops11h 01mMultiple Airlines
Wed 9/104:33 pmISP - DCA
2 stops17h 03mMultiple Airlines
Deal found 7/29$785

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 July 30, 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

Sat 10/18

11:00 am-12:10 pm

Nonstop1h 10m

Islip Long Island

Tue 10/21

11:40 am-12:55 pm

Nonstop1h 15m

$177

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sat 9/13

7:14 pm-10:40 am

1 stop15h 26m

Islip Long Island

Sun 9/14

5:12 pm-8:09 pm

1 stop26h 57m

$195

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Mon 9/8

6:19 am-3:23 pm

2 stops9h 04m

Islip Long Island

Wed 9/10

11:35 am-8:54 pm

1 stop9h 19m

$299

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 9/13

6:55 am-3:05 pm

2 stops8h 10m

Islip Long Island

Sun 9/14

1:55 pm-10:45 pm

2 stops8h 50m

$303

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Thu 10/2

5:45 am-1:45 pm

3 stops32h 00m

Islip Long Island

Sun 10/5

11:40 am-9:58 am

3 stops22h 18m

$513

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sat 10/18

5:16 pm-10:58 am

1 stop17h 42m

Islip Long Island

Tue 10/21

11:53 am-11:14 am

1 stop23h 21m

$714

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Mon 9/8

9:00 am-8:01 pm

2 stops11h 01m

Islip Long Island

Wed 9/10

4:33 pm-9:36 am

2 stops17h 03m

$785

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Sat 8/16

1:37 pm-7:42 pm

1 stop6h 05m

$88

BaltimoreIslip

BWI - ISP

BWIISP

Baltimore/Washington

Sat 10/18

8:25 pm-9:35 pm

Nonstop1h 10m

$89

Washington, D.C.Islip

DCA - ISP

DCAISP

Washington, D.C. Reagan-National

Sat 9/27

8:00 am-4:10 pm

1 stop8h 10m

$99

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 13 results
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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, January is the cheapest month in which you can book a flight from Washington, D.C. to Islip, New York (average of $108). Flying from Washington, D.C. to Islip, New York 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 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 July 30, 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 at noon, which can drop the price by up to 11% versus a flight in the morning.

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 July 30, 2025.
Read through reviews of airlines operating flights from Washington, D.C. to Islip, such as Southwest, JetBlue, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,241 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
JetBlue
7.3
Good
2,913 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Frontier
5.9
Fair
3,237 reviews
Southwest
8.0
Very good
4,241 reviews

Crew

8.6

Boarding

8.1

Comfort

8.0

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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 popular is this Washington, D.C. to Islip, New York flight route?

    Flights from Washington, D.C. to Islip Long Island have been viewed 3 times in the past calendar month.

  • What are the cheapest airlines flying from Washington, D.C. to Islip, New York round-trip?

    Currently priced at $177, Southwest will fly you from Washington, D.C. to Islip, New York and back. In addition to Southwest, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and JetBlue - these airlines can fly you to your destination from $195 and $299, respectively. These flights start at 54% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Washington, D.C. to Islip, New York one-way?

    $88 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Southwest and JetBlue, with prices starting from $89 and $158, respectively.

  • 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 Washington, D.C. Dulles Intl - Islip Long Island, Baltimore/Washington - Islip Long Island or Washington, D.C. Reagan-National - Islip Long Island as they are the most popular.

  • What are the cheapest flights from Washington, D.C. to Islip, New York?

    Looking at all options, your cheapest flight can be booked for $108. While the most popular route (Washington, D.C. Dulles Intl - Islip Long Island) can be booked for $205 on average our data indicates $362 when flying from Washington, D.C. to Islip, New York.

  • 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, January is the cheapest month in which you can book a flight from Washington, D.C. to Islip, New York (average of $108). Flying from Washington, D.C. to Islip, New York 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?

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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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$244Average$366FlexibilityNo cancel feeOn-time63%

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