HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$63+ Cheap flights from Pennsylvania 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Apr 25 — May 21
Sat 4/25
Sat 5/2
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Pennsylvania to Islip with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Pennsylvania to Islip

Cheapest flights from Pennsylvania to Islip
Explore the most affordable flight options available from Pennsylvania to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/25. 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 6/17:27 pm
IAD
-
ISP
1 stop21h 50m
Frontier
Thu 6/411:00 am
ISP
-
IAD
1 stop7h 42m
Frontier
Deal found 3/25$148
This Expedia deal was found by Cheapflights users on 3/24. 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 5/297:27 pm
IAD
-
ISP
1 stop14h 38m
Frontier
Sun 5/3111:00 am
ISP
-
IAD
1 stop7h 42m
Frontier
Deal found 3/24$225
This Southwest deal was found by Cheapflights users on 3/22. 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.
Fri 4/175:00 pm
PIT
-
ISP
1 stop3h 25m
Southwest
Mon 4/204:30 pm
ISP
-
PIT
1 stop3h 30m
Southwest
Deal found 3/22$227
This Southwest deal was found by Cheapflights users on 3/25. 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 4/244:20 pm
PIT
-
ISP
1 stop6h 10m
Southwest
Sat 4/256:00 am
ISP
-
PIT
1 stop5h 30m
Southwest
Deal found 3/25$246
This Southwest deal was found by Cheapflights users on 3/22. 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.
Wed 5/275:55 am
PIT
-
ISP
2 stops7h 55m
Southwest
Sat 5/306:00 am
ISP
-
PIT
1 stop5h 30m
Southwest
Deal found 3/22$248
This Southwest deal was found by Cheapflights users on 3/24. 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 4/235:45 am
PIT
-
ISP
1 stop6h 05m
Southwest
Thu 4/304:30 pm
ISP
-
PIT
1 stop3h 30m
Southwest
Deal found 3/24$253
This Trip.com deal was found by Cheapflights users on 3/24. 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.
Thu 6/187:59 pm
PIT
-
ISP
1 stop14h 04m
Frontier
Mon 6/2210:48 am
ISP
-
PIT
1 stop8h 16m
Frontier
Deal found 3/24$261
This Travelocity deal was found by Cheapflights users on 3/23. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/101:38 pm
IAD
-
ISP
1 stop20h 25m
Frontier
Sun 7/1210:48 am
ISP
-
IAD
1 stop26h 05m
Frontier
Deal found 3/23$270
This Southwest deal was found by Cheapflights users on 3/25. 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 4/244:20 pm
PIT
-
ISP
1 stop6h 10m
Southwest
Sun 4/265:25 pm
ISP
-
PIT
1 stop6h 20m
Southwest
Deal found 3/25$270
This Trip.com deal was found by Cheapflights users on 3/25. 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 5/83:29 pm
LGA
-
ISP
1 stop18h 36m
Multiple Airlines
Mon 5/1111:00 am
ISP
-
LGA
1 stop11h 15m
Multiple Airlines
Deal found 3/25$286
This Expedia deal was found by Cheapflights users on 3/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/301:38 pm
IAD
-
ISP
1 stop20h 25m
Frontier
Mon 8/310:48 am
ISP
-
IAD
1 stop26h 05m
Frontier
Deal found 3/21$315
This Expedia deal was found by Cheapflights users on 3/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:34 am
IAD
-
ISP
1 stop15h 49m
Frontier
Mon 4/66:40 pm
ISP
-
IAD
1 stop22h 51m
Frontier
Deal found 3/21$325

Find flight deals from Pennsylvania to Islip

Keep the following information in mind while searching for Pennsylvania to Islip flight deals. Data was last updated March 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$148
(Kiwi.com)

One-way from

$63
(Kiwi.com)

Popular in

February

Cheapest in

August

Average price

$159
Provider with most accurate pricing for Philadelphia-New York (NYC) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-New York (NYC) flights.
Search Deals
From Pennsylvania to Islip Long Island
Search Deals
One-way flight from Pennsylvania to Islip Long Island
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($55 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 16% potential price decrease ($49 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Pennsylvania 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 March 26, 2026.
Use the filters below to find and compare flights from Pennsylvania to Islip that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Mon 6/1

8:47 pm-5:17 pm

2 stops20h 30m

Islip Long Island

Thu 6/4

11:00 am-6:42 pm

1 stop7h 42m

$173

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Fri 5/29

7:27 pm-10:05 am

1 stop14h 38m

Islip Long Island

Sun 5/31

11:00 am-6:42 pm

1 stop7h 42m

$225
Quickest round-trip

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Fri 4/17

5:00 pm-8:25 pm

1 stop3h 25m

Islip Long Island

Mon 4/20

4:30 pm-8:00 pm

1 stop3h 30m

$227

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Wed 5/27

10:50 am-1:50 pm

1 stop3h 00m

Islip Long Island

Sat 5/30

12:15 pm-8:15 pm

1 stop8h 00m

$243

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Fri 4/24

5:45 am-11:50 am

1 stop6h 05m

Islip Long Island

Sat 4/25

6:00 am-2:10 pm

2 stops8h 10m

$251

New YorkIslip

LGA - ISP

LGAISP

New York LaGuardia

Fri 5/8

3:29 pm-10:05 am

1 stop18h 36m

Islip Long Island

Mon 5/11

11:00 am-10:15 pm

1 stop11h 15m

$286

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Fri 4/24

2:45 pm-11:30 pm

2 stops8h 45m

Islip Long Island

Sun 4/26

5:25 pm-11:45 pm

1 stop6h 20m

$305

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Thu 7/30

1:38 pm-10:03 am

1 stop20h 25m

Islip Long Island

Mon 8/3

10:48 am-12:53 pm

1 stop26h 05m

$315

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Fri 5/8

7:27 pm-10:05 am

1 stop14h 38m

Islip Long Island

Sun 5/10

11:00 am-11:09 pm

2 stops12h 09m

$326

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Thu 4/9

4:01 pm-1:26 am

1 stop9h 25m

Islip Long Island

Sun 4/12

7:59 pm-10:11 am

1 stop14h 12m

$335

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

Best time to book a flight from Pennsylvania to Islip

Have a flexible travel schedule? Discover the best time to fly to Islip from Pennsylvania 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 Pennsylvania to Islip

What is the cheapest month to book a flight from Pennsylvania to Islip, New York?

Currently, April is the cheapest month in which you can book a flight from Pennsylvania to Islip, New York (average of $43). Flying from Pennsylvania to Islip, New York in February is currently the most expensive (average of $93). 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.

Related info for your journey

Find useful and relevant information for your journey from Pennsylvania 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 Pennsylvania?

    If you book a flight to Islip from Pennsylvania, 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 Pennsylvania to Islip, New York?

    Frontier, Southwest, and JetBlue can get you from Pennsylvania to Islip, New York in just under 3h 25m. Your travel time can differ by up to 17h 05m. The distance from Pennsylvania to Islip, New York is about 375 mi. 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 Pennsylvania to Islip, New York?

    The most popular route from Pennsylvania to Islip, New York is Washington, D.C. Dulles Intl - Islip Long Island. You may also consider Washington, D.C. Reagan-National - Islip Long Island or Pittsburgh - Islip Long Island.

  • Can I find deals for flights from Pennsylvania to Islip that include hotel bookings?

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

  • How can I find direct flights from Pennsylvania to Islip?

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

  • Can I find deals for business class flights from Pennsylvania to Islip?

    Yes. Cheapflights offers flight deals from Pennsylvania 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 Pennsylvania to Islip, New York?

    Currently, April is the cheapest month in which you can book a flight from Pennsylvania to Islip, New York (average of $43). Flying from Pennsylvania to Islip, New York in February is currently the most expensive (average of $93). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Pennsylvania to Islip

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Newark flights
San Francisco to John F Kennedy Intl flights
Dallas/Fort Worth to LaGuardia flights
San Francisco to LaGuardia flights
Los Angeles to John F Kennedy Intl flights
Dallas/Fort Worth to Newark flights
Dallas/Fort Worth to John F Kennedy Intl flights
Los Angeles to Newark flights
O'Hare Intl to John F Kennedy Intl flights
Los Angeles to LaGuardia flights
Miami to John F Kennedy Intl flights
Fort Lauderdale to LaGuardia flights
Atlanta to LaGuardia flights
Atlanta to John F Kennedy Intl flights
Orlando to John F Kennedy Intl flights
Fort Lauderdale to John F Kennedy Intl flights
Fort Lauderdale to Newark flights
Seattle to Newark flights
O'Hare Intl to Newark flights
Hobby to John F Kennedy Intl flights
Miami to LaGuardia flights
Miami to Newark flights
Seattle to John F Kennedy Intl flights
Denver to John F Kennedy Intl flights
Atlanta to Newark flights
O'Hare Intl to LaGuardia flights
Hobby to LaGuardia flights
Orlando to Newark flights
West Palm Beach to Newark flights
Tampa to LaGuardia flights
Denver to LaGuardia flights
Tampa to John F Kennedy Intl flights
Denver to Newark flights
Orlando to LaGuardia flights
George Bush Intcntl to John F Kennedy Intl flights
Raleigh to LaGuardia flights
Tampa to Newark flights
Raleigh to John F Kennedy Intl flights
West Palm Beach to John F Kennedy Intl flights
Minneapolis to LaGuardia flights
Minneapolis to John F Kennedy Intl flights
Austin to John F Kennedy Intl flights
Seattle to LaGuardia flights
Austin to Newark flights
West Palm Beach to LaGuardia flights
Santa Ana to Newark flights
Minneapolis to Newark flights
Sky Harbor Intl to John F Kennedy Intl flights
Sky Harbor Intl to Newark flights

Top airline flying from Pennsylvania to Islip

Discover the top airline that operate flights from Pennsylvania 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 March 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$203Average$310FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.