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Islip

$100+ 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 4/18. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Apr 16 — Apr 231
Thu 4/16
Thu 4/23
1 adult, Economy
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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 17, 2026.

This Gotogate deal was found by Cheapflights users on 3/14. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/28:12 am
IAD
-
ISP
1 stop25h 01m
Frontier
Tue 5/55:38 pm
ISP
-
IAD
1 stop22h 44m
Frontier
Deal found 3/14$189
This Mytrip deal was found by Cheapflights users on 3/12. 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.
Mon 5/118:15 pm
PIT
-
ISP
1 stop14h 45m
Frontier
Tue 5/125:38 pm
ISP
-
PIT
1 stop25h 42m
Frontier
Deal found 3/12$210
This Southwest deal was found by Cheapflights users on 3/16. 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.
Mon 4/135:00 pm
PIT
-
ISP
1 stop6h 30m
Southwest
Mon 4/204:30 pm
ISP
-
PIT
1 stop3h 30m
Southwest
Deal found 3/16$228
This Expedia deal was found by Cheapflights users on 3/13. 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 6/17:27 pm
IAD
-
ISP
1 stop21h 50m
Frontier
Thu 6/411:00 am
ISP
-
IAD
1 stop7h 42m
Frontier
Deal found 3/13$256
This Southwest deal was found by Cheapflights users on 3/12. 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.
Sun 5/106:10 am
PIT
-
ISP
1 stop5h 40m
Southwest
Tue 5/1212:30 pm
ISP
-
PIT
1 stop4h 50m
Southwest
Deal found 3/12$264
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 5/151:17 pm
EWR
-
ISP
1 stop22h 00m
Multiple Airlines
Mon 5/188:43 pm
ISP
-
EWR
1 stop17h 16m
Multiple Airlines
Deal found 3/16$270
This Southwest deal was found by Cheapflights users on 3/12. 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.
Sun 5/106:10 am
PIT
-
ISP
1 stop5h 40m
Southwest
Mon 5/114:30 pm
ISP
-
PIT
1 stop3h 30m
Southwest
Deal found 3/12$274
This Southwest deal was found by Cheapflights users on 3/12. 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.
Mon 5/111:35 pm
PIT
-
ISP
2 stops9h 55m
Southwest
Tue 5/126:30 am
ISP
-
PIT
1 stop5h 20m
Southwest
Deal found 3/12$277
This Booking.com deal was found by Cheapflights users on 3/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/24:01 pm
IAD
-
ISP
1 stop18h 04m
Frontier
Fri 6/511:00 am
ISP
-
IAD
1 stop7h 42m
Frontier
Deal found 3/13$288
This Kiwi.com deal was found by Cheapflights users on 3/12. 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 6/75:58 pm
EWR
-
ISP
1 stop16h 07m
Multiple Airlines
Sun 6/1410:03 am
ISP
-
EWR
1 stop24h 28m
Multiple Airlines
Deal found 3/12$307
This Gotogate deal was found by Cheapflights users on 3/12. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/47:27 pm
IAD
-
ISP
1 stop14h 38m
Frontier
Sun 6/711:00 am
ISP
-
IAD
1 stop7h 42m
Frontier
Deal found 3/12$319
This Kiwi.com deal was found by Cheapflights users on 3/16. 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 5/153:29 pm
LGA
-
ISP
2 stops19h 48m
Multiple Airlines
Mon 5/1811:00 am
ISP
-
LGA
1 stop11h 15m
Multiple Airlines
Deal found 3/16$327

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 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$189
(Gotogate)

One-way from

$100
(Mytrip)

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 17, 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

7:27 pm-5:17 pm

1 stop21h 50m

Islip Long Island

Thu 6/4

11:00 am-6:42 pm

1 stop7h 42m

$256

NewarkIslip

EWR - ISP

EWRISP

Newark

Fri 5/15

1:17 pm-11:17 am

1 stop22h 00m

Islip Long Island

Mon 5/18

8:43 pm-1:59 pm

1 stop17h 16m

$270
Quickest round-trip

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Sun 5/10

6:10 am-11:50 am

1 stop5h 40m

Islip Long Island

Mon 5/11

4:30 pm-8:00 pm

1 stop3h 30m

$274

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Mon 5/11

1:35 pm-11:30 pm

2 stops9h 55m

Islip Long Island

Tue 5/12

12:30 pm-8:45 pm

2 stops8h 15m

$282

Washington, D.C.Islip

IAD - ISP

IADISP

Washington, D.C. Dulles Intl

Tue 6/2

4:01 pm-10:05 am

1 stop18h 04m

Islip Long Island

Fri 6/5

11:00 am-6:42 pm

1 stop7h 42m

$288

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Mon 4/13

5:00 pm-11:30 pm

1 stop6h 30m

Islip Long Island

Mon 4/20

6:00 am-3:15 pm

2 stops9h 15m

$293

NewarkIslip

EWR - ISP

EWRISP

Newark

Sun 6/7

5:58 pm-10:05 am

1 stop16h 07m

Islip Long Island

Sun 6/14

10:03 am-10:31 am

1 stop24h 28m

$307

New YorkIslip

LGA - ISP

LGAISP

New York LaGuardia

Fri 5/15

3:29 pm-11:17 am

2 stops19h 48m

Islip Long Island

Mon 5/18

11:00 am-10:15 pm

1 stop11h 15m

$327

PittsburghIslip

PIT - ISP

PITISP

Pittsburgh

Mon 8/24

5:35 am-9:40 am

1 stop4h 05m

Islip Long Island

Thu 8/27

4:05 pm-9:50 pm

1 stop5h 45m

$341

NewarkIslip

EWR - ISP

EWRISP

Newark

Sun 6/7

5:58 pm-10:05 am

1 stop16h 07m

Islip Long Island

Wed 6/17

10:03 am-9:26 pm

1 stop11h 23m

$347

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/16

Showing 1-10 of 60 resultsSorted by cheapest first
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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 6h 30m. Your travel time can differ by up to 18h 31m. 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. Reagan-National - Islip Long Island. You may also consider Washington, D.C. Dulles Intl - 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

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Alternative routes for Pennsylvania 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 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 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$203Average$304FlexibilityNo cancel feeOn-time63%

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