HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$282+ Cheap flights from Philadelphia to Islip, NY (PHL - ISP)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/21. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ISP
Feb 27 — Mar 61
Thu 2/27
Thu 3/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia 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 Philadelphia to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) 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 February 22, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$282
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$418
Provider with most accurate pricing for Philadelphia-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Islip Long Island flights.
Search Deals
From Philadelphia to Islip Long Island
Search Deals
Highest demand for flights based on searches. 23% potential increase in price ($98 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2025
Search Deals

Find flight deals from Philadelphia to Islip

Cheapest flights from Philadelphia to Islip
Explore the most affordable flight options available from Philadelphia to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 22, 2025.

This Trip.com deal was found by Cheapflights users on 2/21. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/219:15 amPHL - ISP
1 stop16h 03mFrontier
Fri 3/286:00 amISP - PHL
1 stop17h 42mFrontier
Deal found 2/21$282
This Mytrip deal was found by Cheapflights users on 2/21. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2110:57 amPHL - ISP
3 stops26h 58mMultiple Airlines
Fri 3/288:25 pmISP - PHL
2 stops26h 31mMultiple Airlines
Deal found 2/21$288

Find flights from Philadelphia to Islip within your budget

Customize your flight search to find flights from Philadelphia 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 February 22, 2025.

Fly from

Philadelphia

Fly to

Islip

Route

Depart

Return

Price

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 3/21

9:15 am-1:18 am

1 stop16h 03m

Islip Long Island

Fri 3/28

6:00 am-11:42 pm

1 stop17h 42m

$282

PhiladelphiaIslip

PHL - ISP

PHLISP

Philadelphia

Fri 3/21

10:57 am-1:55 pm

3 stops26h 58m

Islip Long Island

Fri 3/28

8:25 pm-10:56 pm

2 stops26h 31m

$288

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/21

Compare providers for flights from Philadelphia 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 Philadelphia to Islip in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*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 Philadelphia-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Philadelphia-Islip, New York flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Philadelphia-Islip, New York flights, Cheapflights users trust FlightHub the most. FlightHub 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 Philadelphia-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 Philadelphia to Islip

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

Travel insights for flights from Philadelphia to Islip

Get recent, data-driven insights about flights from Philadelphia to Islip including ideal travel times, pricing trends, and more.

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

Currently, January is the cheapest month in which you can book a flight from Philadelphia to Islip, New York (average of $108). Flying from Philadelphia 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 PHL to ISP?

Find hourly flight availability from Philadelphia 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 February 22, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Philadelphia to Islip, New York as you normally would.

Rainfall in Islip by month

Plan your trip to Islip by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

Temperature in Islip by month

Plan your trip to Islip by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Islip, New York, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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 February 22, 2025.
Frontier
6.0
Okay
3,352 reviews

Entertainment

4.6

Boarding

6.3

Comfort

5.7

Crew

6.9

Overall

6.0

Food

4.8

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

SAN - DEN

This was the worst flight ever. Stuck on the TARMAC for over 2 hrs. Then returned to airport and reboard. Missed our connecting flight but the flight crew that was with the delayed flight didn't miss the boarding and continued on. They didn't even tell us where to go and we could have made our original flight. The later flight they booked us on was delayed an extra 2 hrs. So our flight from San Diego to DC started a 6a and we landed around midnight. Roughly 18 hrs stuck in the most uncomfortable seats, look and feel like military plane KC-10 seats (bare basic metal frame with foam to cover it). No entertainment or charging plugs. Food and soda was priced ridiculous ($3.99 for a can of coke). The only thing free was water. I would never recommend flying this airline unless it was a last minute 1 way hop with only a personal item (i.e. small back pack). I will never book this airline again... Very similar to Spirit (which they are now partners with) which is awful. Again never fly this airline... not even in an emergency. Spend the extra seriously.

Frontier
6.0
Okay
3,352 reviews
Frontier
6.0
Okay
3,352 reviews

Entertainment

4.6

Boarding

6.3

Comfort

5.7

Crew

6.9

Overall

6.0

Food

4.8

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

SAN - DEN

This was the worst flight ever. Stuck on the TARMAC for over 2 hrs. Then returned to airport and reboard. Missed our connecting flight but the flight crew that was with the delayed flight didn't miss the boarding and continued on. They didn't even tell us where to go and we could have made our original flight. The later flight they booked us on was delayed an extra 2 hrs. So our flight from San Diego to DC started a 6a and we landed around midnight. Roughly 18 hrs stuck in the most uncomfortable seats, look and feel like military plane KC-10 seats (bare basic metal frame with foam to cover it). No entertainment or charging plugs. Food and soda was priced ridiculous ($3.99 for a can of coke). The only thing free was water. I would never recommend flying this airline unless it was a last minute 1 way hop with only a personal item (i.e. small back pack). I will never book this airline again... Very similar to Spirit (which they are now partners with) which is awful. Again never fly this airline... not even in an emergency. Spend the extra seriously.

Related info for your journey

Find useful and relevant information for your journey from Philadelphia to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

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

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

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

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

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

Book flights to Philadelphia if you plan to visit one of these locations
Southampton
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 Philadelphia to Islip

See prices for flight routes from nearby airports that may be better suited for you.
Newark to Buffalo flights
LaGuardia to Buffalo flights
Dulles Intl to Newark flights
Dulles Intl to John F Kennedy Intl flights
John F Kennedy Intl to Buffalo flights
Reagan-National to Newark flights
Reagan-National to LaGuardia flights
Pittsburgh to LaGuardia flights
LaGuardia to Rochester flights
Pittsburgh to John F Kennedy Intl flights
Reagan-National to John F Kennedy Intl flights
Newark to Rochester flights
Dulles Intl to LaGuardia flights
Pittsburgh to Newark flights
John F Kennedy Intl to Rochester flights
Dulles Intl to Albany flights
Dulles Intl to Buffalo flights
Reagan-National to Albany flights
Newark to Syracuse flights
Dulles Intl to Syracuse flights
John F Kennedy Intl to Syracuse flights
Reagan-National to Buffalo flights
Dulles Intl to Rochester flights
Reagan-National to Syracuse flights
Reagan-National to Rochester flights
LaGuardia to Syracuse flights
Philadelphia to Buffalo flights
Philadelphia to Rochester flights
Reagan-National to White Plains flights
Philadelphia to Newark flights
Dulles Intl to White Plains flights
Philadelphia to John F Kennedy Intl flights
John F Kennedy Intl to Albany flights
John F Kennedy Intl to Ithaca flights
Dulles Intl to Islip flights
Newark to Ithaca flights
Latrobe to Newark flights
Dulles Intl to Ithaca flights
Philadelphia to Syracuse flights
Newark to Albany flights
Philadelphia to LaGuardia flights
Reagan-National to Islip flights
Allentown to Buffalo flights
LaGuardia to Albany flights
Reagan-National to Ithaca flights
Pittsburgh to Stewart flights
John F Kennedy Intl to Saranac Lake flights
Philadelphia to Albany flights
Newark to Niagara Falls flights
Philadelphia to Plattsburgh flights
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.