When did momondo last update prices for flights from Islip Long Island Airport to Philadelphia Airport?

Prices for flights from Islip Long Island Airport to Philadelphia Airport are updated daily.

How old do you have to be to fly from Islip Long Island Airport to Philadelphia Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Philadelphia Airport.

What documentation or ID do you need to fly to Philadelphia Airport?

The required travel and health documents for your Philadelphia Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Philadelphia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$133 Cheap Flights from Islip, New York to Philadelphia in 2026

Find the cheapest flights from Islip, New York to Philadelphia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:43 pm - 9:30 am

ISP

PHL

15h 47m

1 stop

5:45 pm - 4:58 pm

PHL

ISP

23h 13m

1 stop

$240Frontier

Mon, Sep 28 - Thu, Oct 1

5:27 pm - 7:15 am

ISP

PHL

13h 48m

2 stops

7:25 am - 4:47 pm

PHL

ISP

9h 22m

1 stop

$272Multiple Airlines

Tue, Sep 1 - Tue, Sep 8

5:43 pm - 9:30 am

ISP

PHL

15h 47m

1 stop

5:45 pm - 2:22 pm

PHL

ISP

20h 37m

2 stops

$276Multiple Airlines

Mon, Sep 28 - Thu, Oct 1

5:43 pm - 9:05 am

ISP

PHL

15h 22m

1 stop

3:30 pm - 4:58 pm

PHL

ISP

25h 28m

1 stop

$285Frontier

Thu, Sep 10 - Thu, Sep 17

5:43 pm - 9:05 am

ISP

PHL

15h 22m

1 stop

8:02 pm - 4:58 pm

PHL

ISP

20h 56m

2 stops

$292Frontier

Thu, Sep 10 - Thu, Sep 17

5:43 pm - 9:05 am

ISP

PHL

15h 22m

1 stop

3:30 pm - 4:58 pm

PHL

ISP

25h 28m

1 stop

$295Frontier

Thu, Sep 10 - Thu, Sep 17

5:28 pm - 12:36 pm

ISP

PHL

19h 08m

2 stops

3:30 pm - 4:58 pm

PHL

ISP

25h 28m

1 stop

$295Multiple Airlines

Thu, Sep 10 - Thu, Sep 17

10:57 am - 11:59 pm

ISP

PHL

13h 02m

1 stop

5:16 pm - 6:14 pm

PHL

ISP

24h 58m

1 stop

$298Frontier

Wed, Aug 26 - Wed, Sep 2

11:57 am - 7:15 am

ISP

PHL

43h 18m

2 stops

5:16 pm - 6:14 pm

PHL

ISP

24h 58m

1 stop

$300Multiple Airlines

Wed, Aug 26 - Wed, Sep 2

10:57 am - 7:15 am

ISP

PHL

20h 18m

2 stops

5:05 am - 6:14 pm

PHL

ISP

13h 09m

1 stop

$305Frontier

Thu, Aug 27 - Thu, Sep 3

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JetBlue flights from Islip, New York to Philadelphia

Our best JetBlue deals on Islip, New York to Philadelphia flight tickets

JetBlue

Sep 19

ISP7:00 amIslip Long Island

16h 07m

1 stop

PHL11:07 pmPhiladelphia

Sep 26

PHL7:00 amPhiladelphia

16h 22m

1 stop

ISP11:22 pmIslip Long Island

$653

JetBlue

Sep 6

ISP6:00 amIslip Long Island

10h 06m

1 stop

PHL4:06 pmPhiladelphia

Sep 12

PHL7:00 amPhiladelphia

16h 22m

1 stop

ISP11:22 pmIslip Long Island

$674

JetBlue

Aug 10

ISP6:00 amIslip Long Island

16h 29m

1 stop

PHL10:29 pmPhiladelphia

Aug 12

PHL4:59 pmPhiladelphia

28h 50m

1 stop

ISP9:49 pmIslip Long Island

$954

Frontier flights from Islip, New York to Philadelphia

Our best Frontier deals on Islip, New York to Philadelphia flight tickets

Frontier

Sep 28

ISP5:43 pmIslip Long Island

15h 47m

1 stop

PHL9:30 amPhiladelphia

Oct 1

PHL5:45 pmPhiladelphia

23h 13m

1 stop

ISP4:58 pmIslip Long Island

$240

Frontier

Sep 10

ISP5:43 pmIslip Long Island

15h 22m

1 stop

PHL9:05 amPhiladelphia

Sep 17

PHL3:30 pmPhiladelphia

25h 28m

1 stop

ISP4:58 pmIslip Long Island

$285

Frontier

Sep 10

ISP5:43 pmIslip Long Island

15h 22m

1 stop

PHL9:05 amPhiladelphia

Sep 17

PHL8:02 pmPhiladelphia

20h 56m

2 stops

ISP4:58 pmIslip Long Island

$292

momondo Fare Finder

Use the filters below to find and compare flights from Islip, New York to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 9/28

5:43 pm-9:30 am

1 stop15h 47m

Philadelphia

Thu 10/1

5:45 pm-4:58 pm

1 stop23h 13m

$240

Quickest round-trip

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 9/1

5:27 pm-7:15 am

2 stops13h 48m

Philadelphia

Tue 9/8

7:25 am-4:47 pm

1 stop9h 22m

$272

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 9/28

5:43 pm-9:30 am

1 stop15h 47m

Philadelphia

Thu 10/1

5:45 pm-2:22 pm

2 stops20h 37m

$276

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 9/10

5:43 pm-9:05 am

1 stop15h 22m

Philadelphia

Thu 9/17

3:30 pm-4:58 pm

1 stop25h 28m

$285

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 9/10

5:43 pm-9:05 am

1 stop15h 22m

Philadelphia

Thu 9/17

8:02 pm-4:58 pm

2 stops20h 56m

$292

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 9/10

5:43 pm-9:05 am

1 stop15h 22m

Philadelphia

Thu 9/17

3:30 pm-4:58 pm

1 stop25h 28m

$295

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 9/10

5:28 pm-12:36 pm

2 stops19h 08m

Philadelphia

Thu 9/17

3:30 pm-4:58 pm

1 stop25h 28m

$295

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 8/26

10:57 am-11:59 pm

1 stop13h 02m

Philadelphia

Wed 9/2

5:16 pm-6:14 pm

1 stop24h 58m

$298

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Wed 8/26

11:57 am-7:15 am

2 stops43h 18m

Philadelphia

Wed 9/2

5:16 pm-6:14 pm

1 stop24h 58m

$300

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 8/27

10:57 am-7:15 am

2 stops20h 18m

Philadelphia

Thu 9/3

5:05 am-6:14 pm

1 stop13h 09m

$305

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Islip, New York to Philadelphia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Islip Long Island to Philadelphia?

Frontier and Southwest are the most popular carriers operating from Islip Long Island to Philadelphia

When to book flights from Islip, New York to Philadelphia

Are you open to changing your travel dates? Check out the ideal times to fly from Islip, New York to Philadelphia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Islip, New York to Philadelphia (ISP to PHL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip, New York to Philadelphia

Fastest flight time	8h 40m
Direct flights	None

The fastest flight from Islip, New York to Philadelphia takes 8h 40m

There are no direct flights from Islip, New York to Philadelphia. There are no popular flight routes from Islip, New York to Philadelphia.

Search flight deals

Frequently asked questions about flying from Islip, New York to Philadelphia

How far is Islip Long Island to Philadelphia by plane?
There are 115.4 mi between Islip Long Island and Philadelphia. 8h 40m is a normal flight duration for this route.
When did momondo last update prices for flights from Islip Long Island Airport to Philadelphia Airport?
Prices for flights from Islip Long Island Airport to Philadelphia Airport are updated daily.
How old do you have to be to fly from Islip Long Island Airport to Philadelphia Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Islip Long Island Airport to Philadelphia Airport.
What documentation or ID do you need to fly to Philadelphia Airport?
The required travel and health documents for your Philadelphia Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Philadelphia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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Cherry Hill

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Newark

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Essington

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Chester

Avalon

Lewes

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Why use momondo?

Why should I use momondo to find a flight deal from Islip to Philadelphia?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Islip to Philadelphia for you.

Can I find flights from Islip to Philadelphia with flexible booking policies on momondo?

All flight searches from Islip to Philadelphia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Islip to Philadelphia?

Once you have performed a search for Islip to Philadelphia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Islip to Philadelphia right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Philadelphia from Islip. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.