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Cheap flights from Islip to Puerto Rico from $143

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 11/20. 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

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:58 pm - 2:42 pmISP-SJU
20h 44m1 stop
Multiple Airlines Logo
9:00 am - 10:37 amSJU-ISP
50h 37m2 stops
$265Multiple Airlines
Find Deal
Wed, Nov 12 - Wed, Nov 19
JetBlue Logo
1:15 pm - 10:04 pmISP-SJU
7h 49m1 stop
JetBlue Logo
6:45 am - 12:18 pmSJU-ISP
6h 33m1 stop
$274JetBlue
Find Deal
Wed, Nov 12 - Wed, Nov 19
Frontier Logo
6:37 pm - 2:54 amISP-SJU
7h 17m1 stop
Frontier Logo
10:39 pm - 10:37 amSJU-ISP
12h 58m1 stop
$279Frontier
Find Deal
Thu, Nov 6 - Thu, Nov 13
Frontier Logo
6:37 pm - 2:54 amISP-SJU
7h 17m1 stop
Frontier Logo
10:39 pm - 10:37 amSJU-ISP
12h 58m1 stop
$289Frontier
Find Deal
Thu, Nov 6 - Fri, Nov 14
Frontier Logo
6:37 pm - 11:19 amISP-SJU
15h 42m1 stop
Frontier Logo
10:39 pm - 5:42 pmSJU-ISP
20h 03m1 stop
$294Frontier
Find Deal
Thu, Nov 6 - Mon, Nov 10
Multiple Airlines Logo
8:47 pm - 3:33 amISP-SJU
29h 46m2 stops
Multiple Airlines Logo
10:22 pm - 8:02 amSJU-ISP
10h 40m1 stop
$301Multiple Airlines
Find Deal
Fri, Nov 14 - Fri, Nov 21
Multiple Airlines Logo
11:40 am - 1:19 pmISP-SJU
25h 39m2 stops
Multiple Airlines Logo
3:59 am - 10:37 amSJU-ISP
7h 38m1 stop
$313Multiple Airlines
Find Deal
Thu, Oct 30 - Sun, Nov 2
Frontier Logo
4:58 pm - 2:54 amISP-SJU
8h 56m1 stop
Frontier Logo
1:57 pm - 10:37 amSJU-ISP
21h 40m1 stop
$316Frontier
Find Deal
Sat, Nov 15 - Thu, Nov 20
Frontier Logo
4:58 pm - 1:54 amISP-SJU
8h 56m1 stop
Frontier Logo
3:31 pm - 10:37 amSJU-ISP
19h 06m2 stops
$321Frontier
Find Deal
Wed, Oct 29 - Fri, Oct 31
Southwest Logo
12:55 pm - 12:35 amISP-SJU
10h 40m2 stops
Southwest Logo
5:45 am - 3:20 pmSJU-ISP
10h 35m2 stops
$443Southwest
Find Deal
Wed, Nov 12 - Wed, Nov 19

Frontier flights from Islip to Puerto Rico

Our best Frontier deals on Islip to Puerto Rico flight tickets
Frontier
Nov 6
ISP6:37 pmIslip Long Island
7h 17m
1 stop
SJU2:54 amSan Juan Luis Munoz Marin Intl
Nov 13
SJU10:39 pmSan Juan Luis Munoz Marin Intl
12h 58m
1 stop
ISP10:37 amIslip Long Island
$279
Find similar
Frontier
Nov 6
ISP6:37 pmIslip Long Island
7h 17m
1 stop
SJU2:54 amSan Juan Luis Munoz Marin Intl
Nov 14
SJU10:39 pmSan Juan Luis Munoz Marin Intl
12h 58m
1 stop
ISP10:37 amIslip Long Island
$289
Find similar
Frontier
Nov 6
ISP6:37 pmIslip Long Island
15h 42m
1 stop
SJU11:19 amSan Juan Luis Munoz Marin Intl
Nov 10
SJU10:39 pmSan Juan Luis Munoz Marin Intl
20h 03m
1 stop
ISP5:42 pmIslip Long Island
$294
Find similar

JetBlue flights from Islip to Puerto Rico

Our best JetBlue deals on Islip to Puerto Rico flight tickets
JetBlue
Nov 12
ISP1:15 pmIslip Long Island
7h 49m
1 stop
SJU10:04 pmSan Juan Luis Munoz Marin Intl
Nov 19
SJU6:45 amSan Juan Luis Munoz Marin Intl
6h 33m
1 stop
ISP12:18 pmIslip Long Island
$274
Find similar
JetBlue
Oct 28
ISP12:35 pmIslip Long Island
10h 27m
1 stop
SJU11:02 pmSan Juan Luis Munoz Marin Intl
Oct 29
SJU4:05 amSan Juan Luis Munoz Marin Intl
8h 57m
1 stop
ISP1:02 pmIslip Long Island
$442
Find similar
JetBlue
Oct 30
ISP10:44 amIslip Long Island
9h 10m
1 stop
SJU7:54 pmSan Juan Luis Munoz Marin Intl
Nov 6
SJU6:45 amSan Juan Luis Munoz Marin Intl
9h 55m
1 stop
ISP3:40 pmIslip Long Island
$506
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 October 16, 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

Wed 11/12

4:58 pm-2:42 pm

1 stop20h 44m

San Juan Luis Munoz Marin Intl

Wed 11/19

9:00 am-10:37 am

2 stops50h 37m

$265

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 11/12

1:15 pm-10:04 pm

1 stop7h 49m

San Juan Luis Munoz Marin Intl

Wed 11/19

6:45 am-12:18 pm

1 stop6h 33m

$274

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 11/6

6:37 pm-2:54 am

1 stop7h 17m

San Juan Luis Munoz Marin Intl

Thu 11/13

10:39 pm-10:37 am

1 stop12h 58m

$279

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 11/6

6:37 pm-2:54 am

1 stop7h 17m

San Juan Luis Munoz Marin Intl

Fri 11/14

10:39 pm-10:37 am

1 stop12h 58m

$289

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 11/6

6:37 pm-11:19 am

1 stop15h 42m

San Juan Luis Munoz Marin Intl

Mon 11/10

10:39 pm-5:42 pm

1 stop20h 03m

$294

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 11/14

8:47 pm-3:33 am

2 stops29h 46m

San Juan Luis Munoz Marin Intl

Fri 11/21

10:22 pm-8:02 am

1 stop10h 40m

$301

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 10/30

11:40 am-1:19 pm

2 stops25h 39m

San Juan Luis Munoz Marin Intl

Sun 11/2

3:59 am-10:37 am

1 stop7h 38m

$313

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 11/15

4:58 pm-2:54 am

1 stop8h 56m

San Juan Luis Munoz Marin Intl

Thu 11/20

1:57 pm-10:37 am

1 stop21h 40m

$316

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 10/29

4:58 pm-1:54 am

1 stop8h 56m

San Juan Luis Munoz Marin Intl

Fri 10/31

3:31 pm-10:37 am

2 stops19h 06m

$321

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 11/12

12:55 pm-12:35 am

2 stops10h 40m

San Juan Luis Munoz Marin Intl

Wed 11/19

5:45 am-3:20 pm

2 stops10h 35m

$443

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 February, then you should wait until November to fly from Islip, when ticket prices are also cheap, with an average price of $240.

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
3,137 reviews
Search Frontier flights
JetBluePriceFrom $216Free CancellationRating
7.2
2,908 reviews
Search JetBlue flights
SouthwestPriceFrom $382Free CancellationRating
8.0
4,241 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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Sat 11/15
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Find better results for your trip to Puerto Rico

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