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

JetBlue is the most popular carrier operating from Islip Long Island to Philadelphia

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.

$171 Cheap Flights from Islip, New York to Philadelphia in 2026

1 adult

0 bags

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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.

6:02 pm - 8:59 am

ISP

PHL

14h 57m

1 stop

9:16 pm - 8:57 pm

PHL

ISP

23h 41m

1 stop

$237Frontier

Tue, Jun 2 - Tue, Jun 9

6:02 pm - 8:59 am

ISP

PHL

14h 57m

1 stop

9:16 pm - 11:17 am

PHL

ISP

14h 01m

2 stops

$270Multiple Airlines

Tue, Jun 2 - Tue, Jun 9

6:02 pm - 8:59 am

ISP

PHL

14h 57m

1 stop

9:16 pm - 10:05 am

PHL

ISP

12h 49m

1 stop

$276Frontier

Tue, Jun 2 - Sat, Jun 6

6:02 pm - 2:49 pm

ISP

PHL

20h 47m

2 stops

12:59 pm - 10:05 am

PHL

ISP

21h 06m

1 stop

$310Frontier

Tue, Jun 2 - Sat, Jun 6

11:00 am - 11:29 pm

ISP

PHL

12h 29m

1 stop

5:34 pm - 10:05 am

PHL

ISP

16h 31m

1 stop

$320Frontier

Fri, May 29 - Sat, May 30

11:00 am - 12:44 am

ISP

PHL

13h 44m

2 stops

5:34 pm - 10:05 am

PHL

ISP

16h 31m

1 stop

$321Multiple Airlines

Fri, May 29 - Sat, May 30

7:18 pm - 11:11 am

ISP

PHL

15h 53m

1 stop

9:16 pm - 9:58 am

PHL

ISP

12h 42m

1 stop

$325Multiple Airlines

Tue, Jun 16 - Tue, Jul 7

5:27 pm - 8:54 am

ISP

PHL

39h 27m

2 stops

10:01 am - 5:29 pm

PHL

ISP

7h 28m

1 stop

$432Multiple Airlines

Tue, May 19 - Sat, May 23

5:27 pm - 11:16 am

ISP

PHL

17h 49m

1 stop

10:01 am - 5:29 pm

PHL

ISP

7h 28m

1 stop

$447Multiple Airlines

Tue, May 19 - Sat, May 23

3:07 pm - 11:51 pm

ISP

PHL

8h 44m

1 stop

7:00 am - 2:12 pm

PHL

ISP

7h 12m

1 stop

$638JetBlue

Mon, Jun 22 - Thu, Jun 25

Frontier flights from Islip, New York to Philadelphia

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

Frontier

Jun 2

ISP6:02 pmIslip Long Island

14h 57m

1 stop

PHL8:59 amPhiladelphia

Jun 9

PHL9:16 pmPhiladelphia

23h 41m

1 stop

ISP8:57 pmIslip Long Island

$237

Frontier

Jun 2

ISP6:02 pmIslip Long Island

14h 57m

1 stop

PHL8:59 amPhiladelphia

Jun 6

PHL9:16 pmPhiladelphia

12h 49m

1 stop

ISP10:05 amIslip Long Island

$276

Frontier

Jun 2

ISP6:02 pmIslip Long Island

20h 47m

2 stops

PHL2:49 pmPhiladelphia

Jun 6

PHL12:59 pmPhiladelphia

21h 06m

1 stop

ISP10:05 amIslip Long Island

$310

JetBlue flights from Islip, New York to Philadelphia

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

JetBlue

Jun 22

ISP3:07 pmIslip Long Island

8h 44m

1 stop

PHL11:51 pmPhiladelphia

Jun 25

PHL7:00 amPhiladelphia

7h 12m

1 stop

ISP2:12 pmIslip Long Island

$638

JetBlue

Oct 10

ISP6:00 amIslip Long Island

7h 02m

1 stop

PHL1:02 pmPhiladelphia

Oct 11

PHL1:58 pmPhiladelphia

7h 37m

1 stop

ISP9:35 pmIslip Long Island

$673

JetBlue

May 7

ISP8:59 pmIslip Long Island

19h 24m

1 stop

PHL4:23 pmPhiladelphia

May 11

PHL5:18 pmPhiladelphia

26h 46m

1 stop

ISP8:04 pmIslip Long Island

$948

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

Tue 6/2

6:02 pm-8:59 am

1 stop14h 57m

Philadelphia

Tue 6/9

9:16 pm-8:57 pm

1 stop23h 41m

$237

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 6/2

6:02 pm-8:59 am

1 stop14h 57m

Philadelphia

Tue 6/9

9:16 pm-11:17 am

2 stops14h 01m

$270

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 6/2

6:02 pm-8:59 am

1 stop14h 57m

Philadelphia

Sat 6/6

9:16 pm-10:05 am

1 stop12h 49m

$276

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 6/2

6:02 pm-2:49 pm

2 stops20h 47m

Philadelphia

Sat 6/6

12:59 pm-10:05 am

1 stop21h 06m

$310

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 5/29

11:00 am-11:29 pm

1 stop12h 29m

Philadelphia

Sat 5/30

5:34 pm-10:05 am

1 stop16h 31m

$320

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 5/29

11:00 am-12:44 am

2 stops13h 44m

Philadelphia

Sat 5/30

5:34 pm-10:05 am

1 stop16h 31m

$321

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 6/16

7:18 pm-11:11 am

1 stop15h 53m

Philadelphia

Tue 7/7

9:16 pm-9:58 am

1 stop12h 42m

$325

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 5/19

5:27 pm-8:54 am

2 stops39h 27m

Philadelphia

Sat 5/23

10:01 am-5:29 pm

1 stop7h 28m

$432

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 5/19

5:27 pm-11:16 am

1 stop17h 49m

Philadelphia

Sat 5/23

10:01 am-5:29 pm

1 stop7h 28m

$447

Quickest round-trip

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Mon 6/22

3:07 pm-11:51 pm

1 stop8h 44m

Philadelphia

Thu 6/25

7:00 am-2:12 pm

1 stop7h 12m

$638

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

Prices

Airlines

What is the cheapest day to depart on your flight to Philadelphia?

The cheapest day to depart from Islip, New York to Philadelphia is on a Thursday. Travelers who choose to depart for Philadelphia on a Thursday will often find tickets for as low as $256. On the other hand, Friday is the most expensive day to depart from Islip, New York because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $499.

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	7h 40m
Direct flights	None

The fastest flight from Islip, New York to Philadelphia takes 7h 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. 7h 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.

Wildwood

Rehoboth Beach

Cape May

Wildwood Crest

Ocean City

Cherry Hill

King of Prussia

Newark

Dewey Beach

Reading

Avalon

Dover

North Wildwood

Lewes

Stone Harbor

New Castle

Essington

Vineland

Pottstown

Somers Point

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.