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Cheap flights from Islip to Puerto Rico from $109

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Islip to Puerto Rico departing on 8/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Islip to Puerto Rico

Cheap round-trip flights

Frontier Logo
5:05 pm - 2:34 amISP-SJU
9h 29m1 stop
Frontier Logo
8:00 am - 4:23 pmSJU-ISP
8h 23m1 stop
$218Frontier
Find Deal
Sat, Sep 20 - Sat, Sep 27
Frontier Logo
5:05 pm - 8:31 pmISP-SJU
27h 26m1 stop
Frontier Logo
4:42 pm - 10:40 amSJU-ISP
17h 58m1 stop
$228Frontier
Find Deal
Mon, Sep 22 - Sat, Sep 27
Frontier Logo
5:05 pm - 11:59 pmISP-SJU
6h 54m1 stop
Frontier Logo
3:39 am - 10:40 amSJU-ISP
7h 01m1 stop
$238Frontier
Find Deal
Fri, Sep 19 - Sat, Sep 20
JetBlue Logo
1:57 pm - 9:04 pmISP-SJU
7h 07m1 stop
JetBlue Logo
7:00 am - 1:02 pmSJU-ISP
7h 02m1 stop
$267JetBlue
Find Deal
Wed, Oct 29 - Tue, Nov 4
Frontier Logo
4:58 pm - 9:24 pmISP-SJU
27h 26m1 stop
Frontier Logo
3:59 am - 8:42 pmSJU-ISP
17h 43m1 stop
$268Frontier
Find Deal
Wed, Nov 5 - Sat, Nov 8
Frontier Logo
5:05 pm - 11:59 pmISP-SJU
6h 54m1 stop
Frontier Logo
3:39 am - 10:40 amSJU-ISP
7h 01m1 stop
$278Frontier
Find Deal
Fri, Sep 19 - Sun, Sep 28
Frontier Logo
11:25 am - 2:34 amISP-SJU
15h 09m1 stop
Frontier Logo
8:00 am - 4:27 pmSJU-ISP
8h 27m1 stop
$284Frontier
Find Deal
Tue, Sep 16 - Fri, Sep 26
JetBlue Logo
1:57 pm - 10:04 pmISP-SJU
7h 07m1 stop
JetBlue Logo
5:05 am - 1:02 pmSJU-ISP
8h 57m1 stop
$306JetBlue
Find Deal
Mon, Nov 3 - Wed, Nov 12
JetBlue Logo
1:57 pm - 10:04 pmISP-SJU
7h 07m1 stop
JetBlue Logo
5:05 am - 1:02 pmSJU-ISP
8h 57m1 stop
$307JetBlue
Find Deal
Tue, Nov 4 - Wed, Nov 12
Logo
6:05 am - 3:10 pmISP-SJU
9h 05m1 stop
Logo
12:28 am - 10:50 amSJU-ISP
34h 22m2 stops
$352
Find Deal
Tue, Sep 2 - Fri, Sep 5

Frontier flights from Islip to Puerto Rico

Our best Frontier deals on Islip to Puerto Rico flight tickets
Frontier
Sep 20
ISP5:05 pmIslip Long Island
9h 29m
1 stop
SJU2:34 amSan Juan Luis Munoz Marin Intl
Sep 27
SJU8:00 amSan Juan Luis Munoz Marin Intl
8h 23m
1 stop
ISP4:23 pmIslip Long Island
$218
Find similar
Frontier
Aug 26
ISP6:05 amIslip Long Island
13h 03m
1 stop
SJU7:08 pmSan Juan Luis Munoz Marin Intl
Aug 30
SJU8:23 pmSan Juan Luis Munoz Marin Intl
27h 36m
1 stop
ISP11:59 pmIslip Long Island
$228
Find similar
Frontier
Sep 19
ISP5:05 pmIslip Long Island
6h 54m
1 stop
SJU11:59 pmSan Juan Luis Munoz Marin Intl
Sep 20
SJU3:39 amSan Juan Luis Munoz Marin Intl
7h 01m
1 stop
ISP10:40 amIslip Long Island
$238
Find similar

JetBlue flights from Islip to Puerto Rico

Our best JetBlue deals on Islip to Puerto Rico flight tickets
JetBlue
Oct 29
ISP1:57 pmIslip Long Island
7h 07m
1 stop
SJU9:04 pmSan Juan Luis Munoz Marin Intl
Nov 4
SJU7:00 amSan Juan Luis Munoz Marin Intl
7h 02m
1 stop
ISP1:02 pmIslip Long Island
$267
Find similar
JetBlue
Nov 3
ISP1:57 pmIslip Long Island
7h 07m
1 stop
SJU10:04 pmSan Juan Luis Munoz Marin Intl
Nov 12
SJU5:05 amSan Juan Luis Munoz Marin Intl
8h 57m
1 stop
ISP1:02 pmIslip Long Island
$306
Find similar
JetBlue
Nov 4
ISP1:57 pmIslip Long Island
7h 07m
1 stop
SJU10:04 pmSan Juan Luis Munoz Marin Intl
Nov 12
SJU5:05 amSan Juan Luis Munoz Marin Intl
8h 57m
1 stop
ISP1:02 pmIslip Long Island
$307
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Islip to Puerto Rico 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, momondo users made 832,500 searches. Data last updated August 20, 2025.
Use the filters below to find and compare flights from Islip to Puerto Rico that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 9/20

5:05 pm-2:34 am

1 stop9h 29m

San Juan Luis Munoz Marin Intl

Sat 9/27

8:00 am-4:23 pm

1 stop8h 23m

$218

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 9/22

5:05 pm-8:31 pm

1 stop27h 26m

San Juan Luis Munoz Marin Intl

Sat 9/27

4:42 pm-10:40 am

1 stop17h 58m

$228

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 9/19

5:05 pm-11:59 pm

1 stop6h 54m

San Juan Luis Munoz Marin Intl

Sat 9/20

3:39 am-10:40 am

1 stop7h 01m

$238

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 10/29

1:57 pm-9:04 pm

1 stop7h 07m

San Juan Luis Munoz Marin Intl

Tue 11/4

7:00 am-1:02 pm

1 stop7h 02m

$267

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 11/5

4:58 pm-9:24 pm

1 stop27h 26m

San Juan Luis Munoz Marin Intl

Sat 11/8

3:59 am-8:42 pm

1 stop17h 43m

$268

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 9/19

5:05 pm-11:59 pm

1 stop6h 54m

San Juan Luis Munoz Marin Intl

Sun 9/28

3:39 am-10:40 am

1 stop7h 01m

$278

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Tue 9/16

11:25 am-2:34 am

1 stop15h 09m

San Juan Luis Munoz Marin Intl

Fri 9/26

8:00 am-4:27 pm

1 stop8h 27m

$284

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 11/3

1:57 pm-10:04 pm

1 stop7h 07m

San Juan Luis Munoz Marin Intl

Wed 11/12

5:05 am-1:02 pm

1 stop8h 57m

$306

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Tue 11/4

1:57 pm-10:04 pm

1 stop7h 07m

San Juan Luis Munoz Marin Intl

Wed 11/12

5:05 am-1:02 pm

1 stop8h 57m

$307

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Tue 9/2

6:05 am-3:10 pm

1 stop9h 05m

San Juan Luis Munoz Marin Intl

Fri 9/5

12:28 am-10:50 am

2 stops34h 22m

$352

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Puerto Rico from

How to get the cheapest flight ticket from Islip to Puerto Rico

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 month to fly to Puerto Rico?

If you don’t want to visit Puerto Rico in November, then you should wait until February to fly from Islip, when ticket prices are also cheap, with an average price of $210.

What is the cheapest day to depart on your flight to Puerto Rico?

On average, the least expensive day to fly to Puerto Rico from Islip is on a Friday. momondo users have found tickets for Friday departures for as low as $260. However, this price may fluctuate depending on the airline, the season, and holidays. The most expensive day to fly to Puerto Rico is Sunday, with ticket prices averaging around $734.

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

Our most recent data shows that the best time of day to fly to Puerto Rico is in the evening. Flights from Islip to Puerto Rico during this time can be as low as $208. In contrast, the most expensive time of day to depart to Puerto Rico is in the afternoon when prices are around $390.

Can stopping save me money on Islip to Puerto Rico flights?

You could potentially save up to 14% on your flight if you consider stops on a Islip to Puerto Rico flight.

Cheap Islip to Puerto Rico flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Islip to Puerto Rico

Direct flights

None
There are no direct flights from Islip to Puerto Rico. There are no popular flight routes from Islip to Puerto Rico.
Search flight deals

  • When did momondo last update prices for flights from Islip Long Island Airport to Puerto Rico?

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

  • How many operators does momondo search for flights from Islip Long Island Airport to Puerto Rico?

  • How old do you have to be to fly from Islip Long Island Airport to Puerto Rico?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Islip Long Island Airport to Puerto Rico.

  • What documentation or ID do you need to fly to Puerto Rico?

    The travel and health documents you'll need for your trip to Puerto Rico may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Puerto Rico. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Islip to Puerto Rico

Compare and see reviews for airlines that fly from Islip to Puerto Rico with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $59Free CancellationRating
5.8
3,207 reviews
Search Frontier flights
JetBluePriceFrom $231Free CancellationRating
7.2
2,916 reviews
Search JetBlue flights
SouthwestPriceFrom $477Free CancellationRating
8.0
4,246 reviews
Search Southwest flights

Why use momondo?

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

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 Puerto Rico for you.

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

Flights from Islip to Puerto Rico with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Islip to Puerto Rico?

Once all potential Islip to Puerto Rico flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are simply researching potential flights to Puerto Rico, momondo offers a useful price alert feature which will track prices for flights to Puerto Rico from Islip and alert you when they change.

An easier way to manage your Puerto Rico trip

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Find better results for your trip to Puerto Rico

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