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

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

What airlines fly to Philadelphia?

United Airlines, JetBlue and American Airlines are the top three most popular airlines that fly to Philadelphia from Islip, New York according to our data. United Airlines is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Philadelphia. Keep in mind that there are 3 different airlines that fly to Philadelphia on a routine basis, so you have a few additional options to choose from.

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.

$68 Cheap Flights from Islip to Philadelphia in 2025/26

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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.

10:02 am - 11:03 pmISP-PHL

13h 01m1 stop

8:42 pm - 8:02 amPHL-ISP

11h 20m1 stop

$165Multiple Airlines

Find Deal

Thu, Nov 20 - Sun, Nov 23

8:29 pm - 12:49 pmISP-PHL

16h 20m1 stop

10:00 pm - 10:44 pmPHL-ISP

24h 44m1 stop

$176Frontier

Find Deal

Tue, Dec 2 - Tue, Dec 9

9:54 am - 10:31 pmISP-PHL

12h 37m1 stop

7:02 pm - 5:42 pmPHL-ISP

22h 40m1 stop

$199Frontier

Find Deal

Thu, Nov 13 - Mon, Nov 17

11:40 am - 10:31 pmISP-PHL

10h 51m2 stops

10:32 pm - 5:42 pmPHL-ISP

19h 10m1 stop

$201Multiple Airlines

Find Deal

Thu, Nov 13 - Mon, Nov 17

1:15 pm - 10:55 pmISP-PHL

9h 40m1 stop

11:30 am - 5:56 pmPHL-ISP

6h 26m1 stop

$337JetBlue

Find Deal

Tue, Nov 18 - Sat, Nov 22

1:50 pm - 10:55 pmISP-PHL

9h 05m1 stop

11:30 am - 5:56 pmPHL-ISP

6h 26m1 stop

$441JetBlue

Find Deal

Sat, Nov 15 - Sat, Nov 22

8:35 pm - 10:31 amISP-PHL

13h 56m1 stop

10:00 pm - 11:25 amPHL-ISP

13h 25m1 stop

$503Frontier

Find Deal

Fri, Dec 26 - Mon, Dec 29

8:35 pm - 12:40 amISP-PHL

28h 05m1 stop

6:00 am - 11:25 amPHL-ISP

29h 25m2 stops

$556Frontier

Find Deal

Fri, Dec 26 - Mon, Dec 29

12:40 pm - 2:08 pmISP-PHL

25h 28m2 stops

10:33 am - 7:45 pmPHL-ISP

9h 12m2 stops

$695Multiple Airlines

Find Deal

Tue, Dec 2 - Tue, Dec 9

12:40 pm - 9:46 amISP-PHL

21h 06m2 stops

8:00 pm - 4:15 pmPHL-ISP

20h 15m2 stops

$895Multiple Airlines

Find Deal

Thu, Nov 13 - Mon, Nov 17

JetBlue flights from Islip, New York to Philadelphia

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

JetBlue

Nov 18

ISP1:15 pmIslip Long Island

9h 40m

1 stop

PHL10:55 pmPhiladelphia

Nov 22

PHL11:30 amPhiladelphia

6h 26m

1 stop

ISP5:56 pmIslip Long Island

$337

Find similar

JetBlue

Nov 15

ISP1:50 pmIslip Long Island

9h 05m

1 stop

PHL10:55 pmPhiladelphia

Nov 22

PHL11:30 amPhiladelphia

6h 26m

1 stop

ISP5:56 pmIslip Long Island

$441

Find similar

Frontier flights from Islip, New York to Philadelphia

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

Frontier

Dec 2

ISP8:29 pmIslip Long Island

16h 20m

1 stop

PHL12:49 pmPhiladelphia

Dec 9

PHL10:00 pmPhiladelphia

24h 44m

1 stop

ISP10:44 pmIslip Long Island

$176

Find similar

Frontier

Nov 13

ISP9:54 amIslip Long Island

12h 37m

1 stop

PHL10:31 pmPhiladelphia

Nov 17

PHL7:02 pmPhiladelphia

22h 40m

1 stop

ISP5:42 pmIslip Long Island

$199

Find similar

Frontier

Dec 26

ISP8:35 pmIslip Long Island

13h 56m

1 stop

PHL10:31 amPhiladelphia

Dec 29

PHL10:00 pmPhiladelphia

13h 25m

1 stop

ISP11:25 amIslip Long Island

$503

Find similar

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

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 11/20

10:02 am-11:03 pm

1 stop13h 01m

Philadelphia

Sun 11/23

8:42 pm-8:02 am

1 stop11h 20m

$165

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 12/2

8:29 pm-12:49 pm

1 stop16h 20m

Philadelphia

Tue 12/9

10:00 pm-10:44 pm

1 stop24h 44m

$176

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 11/13

9:54 am-10:31 pm

1 stop12h 37m

Philadelphia

Mon 11/17

7:02 pm-5:42 pm

1 stop22h 40m

$199

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 11/13

11:40 am-10:31 pm

2 stops10h 51m

Philadelphia

Mon 11/17

10:32 pm-5:42 pm

1 stop19h 10m

$201

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 11/18

1:15 pm-10:55 pm

1 stop9h 40m

Philadelphia

Sat 11/22

11:30 am-5:56 pm

1 stop6h 26m

$337

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Sat 11/15

1:50 pm-10:55 pm

1 stop9h 05m

Philadelphia

Sat 11/22

11:30 am-5:56 pm

1 stop6h 26m

$441

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 12/26

8:35 pm-10:31 am

1 stop13h 56m

Philadelphia

Mon 12/29

10:00 pm-11:25 am

1 stop13h 25m

$503

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Fri 12/26

8:35 pm-12:40 am

1 stop28h 05m

Philadelphia

Mon 12/29

6:00 am-11:25 am

2 stops29h 25m

$556

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Tue 12/2

12:40 pm-2:08 pm

2 stops25h 28m

Philadelphia

Tue 12/9

10:33 am-7:45 pm

2 stops9h 12m

$695

IslipPhiladelphia

ISP - PHL

ISPPHL

Islip Long Island

Thu 11/13

12:40 pm-9:46 am

2 stops21h 06m

Philadelphia

Mon 11/17

8:00 pm-4:15 pm

2 stops20h 15m

$895

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 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 Friday. Travelers who choose to depart for Philadelphia on a Friday will often find tickets for as low as $445. On the other hand, Sunday 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 $815.

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

According to our data, the cheapest time of day to fly to Philadelphia is at noon. momondo users have found flights departing from Islip, New York to Philadelphia at noon for as low as $401. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Philadelphia is in the afternoon when prices are around $702.

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

Direct flights	None

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

How far is Islip Long Island to Philadelphia by plane?
There are 115.4 mi between Islip Long Island and Philadelphia. 9h 05m 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

Cape May

Rehoboth Beach

Ocean City

Wildwood Crest

King of Prussia

Dewey Beach

Cherry Hill

Reading

Newark

North Wildwood

Dover

Avalon

Lewes

Stone Harbor

Vineland

Essington

Pottstown

New Castle

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.