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$91+ Cheap flights from Islip, NY (ISP) to Pennsylvania

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 12/17. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — PHL
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Cheap flight deals from Islip to Pennsylvania

Keep the following information in mind while searching for Islip to Pennsylvania flight deals. Data was last updated October 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$157
(Trip.com)

One-way from

$91
(Kiwi.com)

Popular in

July

Cheapest in

December

Average price

$484
Provider with most accurate pricing for New York (NYC)-Philadelphia flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Philadelphia flights.
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From Islip Long Island to Pennsylvania
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One-way flight from Islip Long Island to Pennsylvania
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Highest demand for flights based on searches. 12% potential increase in price ($58 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($27 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Islip to Pennsylvania

Cheapest flights from Islip to Pennsylvania
Explore the most affordable flight options available from Islip to Pennsylvania. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 28, 2025.

This Trip.com deal was found by Cheapflights users on 10/28. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/116:27 pmISP - LGA
1 stop21h 32mFrontier
Fri 11/144:30 pmLGA - ISP
1 stop18h 07mFrontier
Deal found 10/28$157
This Trip.com deal was found by Cheapflights users on 10/27. 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 11/139:54 amISP - JFK
2 stops14h 39mFrontier
Thu 11/204:00 pmJFK - ISP
1 stop7h 59mFrontier
Deal found 10/27$170
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/136:37 pmISP - LGA
1 stop19h 23mMultiple Airlines
Thu 11/206:00 pmLGA - ISP
2 stops16h 37mMultiple Airlines
Deal found 10/28$210
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Wed 11/2611:03 amISP - JFK
1 stop22h 59mFrontier
Wed 12/36:59 amJFK - ISP
1 stop15h 45mFrontier
Deal found 10/27$222
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 11/108:02 pmISP - LGA
2 stops19h 28mFrontier
Fri 11/144:30 pmLGA - ISP
1 stop18h 07mFrontier
Deal found 10/26$253
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/124:58 pmISP - PIT
2 stops18h 11mMultiple Airlines
Sun 11/166:45 pmPIT - ISP
1 stop15h 52mMultiple Airlines
Deal found 10/28$255
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 11/98:57 pmISP - LGA
2 stops23h 33mMultiple Airlines
Wed 11/125:30 pmLGA - ISP
1 stop24h 12mMultiple Airlines
Deal found 10/27$263
This Kiwi.com deal was found by Cheapflights users on 10/26. 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.
Wed 10/294:58 pmISP - PHL
1 stop19h 55mMultiple Airlines
Fri 10/318:43 pmPHL - ISP
2 stops13h 54mMultiple Airlines
Deal found 10/26$263
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 11/154:58 pmISP - PHL
1 stop6h 55mMultiple Airlines
Sun 11/1610:32 pmPHL - ISP
1 stop12h 05mMultiple Airlines
Deal found 10/27$273
This Trip.com deal was found by Cheapflights users on 10/26. 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.
Sat 11/154:58 pmISP - PIT
1 stop24h 52mFrontier
Mon 11/172:38 pmPIT - ISP
2 stops27h 04mFrontier
Deal found 10/26$274
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 11/98:57 pmISP - LGA
2 stops19h 32mFrontier
Wed 11/125:30 pmLGA - ISP
1 stop24h 12mFrontier
Deal found 10/26$278
This Southwest deal was found by Cheapflights users on 10/26. 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 11/145:30 pmISP - PIT
1 stop6h 15mSouthwest
Sun 11/165:30 amPIT - ISP
1 stop7h 20mSouthwest
Deal found 10/26$278

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Pennsylvania 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 October 28, 2025.
Use the filters below to find and compare flights from Islip to Pennsylvania that are best for you.

Fly from

Islip

Fly to

Pennsylvania

Route

Depart

Return

Price

IslipNew York

ISP - LGA

ISPLGA

Islip Long Island

Tue 11/11

6:27 pm-3:59 pm

1 stop21h 32m

New York LaGuardia

Fri 11/14

4:30 pm-10:37 am

1 stop18h 07m

$157

IslipNew York

ISP - JFK

ISPJFK

Islip Long Island

Thu 11/13

9:54 am-12:33 am

2 stops14h 39m

New York John F Kennedy Intl

Thu 11/20

4:00 pm-11:59 pm

1 stop7h 59m

$170

IslipNew York

ISP - LGA

ISPLGA

Islip Long Island

Thu 11/13

6:37 pm-2:00 pm

1 stop19h 23m

New York LaGuardia

Thu 11/20

6:00 pm-10:37 am

2 stops16h 37m

$210

IslipPittsburgh

ISP - PIT

ISPPIT

Islip Long Island

Fri 1/23

11:35 am-10:37 pm

2 stops11h 02m

Pittsburgh

Sun 1/25

2:18 pm-10:40 am

1 stop20h 22m

$213

IslipNew York

ISP - JFK

ISPJFK

Islip Long Island

Wed 11/26

11:03 am-10:02 am

1 stop22h 59m

New York John F Kennedy Intl

Wed 12/3

6:59 am-10:44 pm

1 stop15h 45m

$222

IslipNew York

ISP - LGA

ISPLGA

Islip Long Island

Thu 1/29

11:35 am-11:29 am

1 stop23h 54m

New York LaGuardia

Sun 2/8

3:00 pm-1:31 pm

2 stops22h 31m

$246

IslipNew York

ISP - LGA

ISPLGA

Islip Long Island

Fri 1/30

11:35 am-11:29 am

1 stop23h 54m

New York LaGuardia

Sun 2/8

3:00 pm-1:31 pm

2 stops22h 31m

$246

IslipNew York

ISP - LGA

ISPLGA

Islip Long Island

Mon 11/10

8:02 pm-3:30 pm

2 stops19h 28m

New York LaGuardia

Fri 11/14

4:30 pm-10:37 am

1 stop18h 07m

$253

IslipNew York

ISP - LGA

ISPLGA

Islip Long Island

Sun 11/9

8:57 pm-8:30 pm

2 stops23h 33m

New York LaGuardia

Wed 11/12

5:30 pm-5:42 pm

1 stop24h 12m

$263

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 11/15

4:58 pm-11:53 pm

1 stop6h 55m

Philadelphia

Sun 11/16

10:32 pm-10:37 am

1 stop12h 05m

$273

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

Showing 1-10 of 60 results
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Best time to book a flight from Islip to Pennsylvania

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

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

Currently, May is the cheapest month in which you can book a flight from Islip, New York to Pennsylvania (average of $31). Flying from Islip, New York to Pennsylvania in December is currently the most expensive (average of $66). 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 ISP to PA?

Find hourly flight availability from Islip to Pennsylvania. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 28, 2025.

It’s optimal to fly from Islip, New York to Pennsylvania in the morning. By choosing this option you can save up to 33% on the cost of your flight, compared to a flight at noon.

Reviews of airlines servicing Pennsylvania

Get insights into the airlines that provide service to Pennsylvania. 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 Pennsylvania. Reviews last updated October 28, 2025.
Get a feel of what it's like to fly with Southwest from Islip to Pennsylvania by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Comfort

8.0

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Islip to Pennsylvania. 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 from for flights from Islip to Pennsylvania?

    Located just 7.2 mi from the city center, Islip Long Island (ISP) is the airport most travelers will use when flying to Pennsylvania from Islip.

  • How long is the flight from Islip, New York to Pennsylvania?

    For as low as $327, Frontier can have you in Pennsylvania from Islip, New York in 6h 30m. There are 248 mi between Islip, New York and Pennsylvania. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Islip, New York to Pennsylvania one-way?

    One-way options have recently been found by users for as low as $91 on Frontier. Other airlines that offer cheap prices include JetBlue from $113 and Southwest from $189 one-way.

  • What are the most popular routes from Islip, New York to Pennsylvania?

    When deciding which route to take from Islip, New York to Pennsylvania consider Islip Long Island - Washington, D.C. Reagan-National, Islip Long Island - Philadelphia or Islip Long Island - New York John F Kennedy Intl as they are the most popular.

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

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

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

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

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

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

    Currently, May is the cheapest month in which you can book a flight from Islip, New York to Pennsylvania (average of $31). Flying from Islip, New York to Pennsylvania in December is currently the most expensive (average of $66). 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

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Alternative routes for Islip to Pennsylvania

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Islip to Pennsylvania

Discover the top airline that operate flights from Islip to Pennsylvania. 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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$183Average$453FlexibilityNo cancel feeOn-time63%

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