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Puerto Rico

$127+ Cheap flights from Islip (ISP) to Puerto Rico

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Islip to Puerto Rico

Keep the following information in mind while searching for Islip to Puerto Rico flight deals. Data was last updated September 11, 2025.

Round-trip from

$253
(Cheapflightsfares)

One-way from

$127
(CheapOair)

Popular in

December

Cheapest in

March

Average price

$235
From Islip Long Island to Puerto Rico
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One-way flight from Islip Long Island to Puerto Rico
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Highest demand for flights based on searches. 8% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Islip to Puerto Rico

Cheapest flights from Islip to Puerto Rico
Explore the most affordable flight options available from Islip to Puerto Rico. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/205:05 pmISP - SJU
1 stop6h 54mFrontier
Sat 9/203:39 amSJU - ISP
1 stop7h 01mFrontier
Deal found 9/11$248
This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/205:05 pmISP - SJU
1 stop6h 54mFrontier
Fri 9/263:39 amSJU - ISP
1 stop7h 16mFrontier
Deal found 9/11$253
This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/294:58 pmISP - SJU
1 stop8h 56mFrontier
Sat 11/17:30 amSJU - ISP
1 stop25h 32mFrontier
Deal found 9/10$254
This Cheapflightsfares deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/275:05 pmISP - SJU
1 stop6h 54mFrontier
Mon 9/293:39 amSJU - ISP
1 stop7h 01mFrontier
Deal found 9/9$258
This Frontier deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/314:58 pmISP - SJU
1 stop8h 56mFrontier
Sun 11/210:39 pmSJU - ISP
1 stop12h 58mFrontier
Deal found 9/11$264
This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1711:35 amISP - SJU
1 stop14h 59mFrontier
Sun 9/219:07 amSJU - ISP
1 stop25h 33mFrontier
Deal found 9/10$269
This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/69:09 pmISP - SJU
1 stop22h 18mFrontier
Tue 12/911:05 amSJU - ISP
1 stop9h 09mFrontier
Deal found 9/10$284
This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/265:05 pmISP - SJU
1 stop6h 54mFrontier
Sat 9/273:39 amSJU - ISP
1 stop7h 01mFrontier
Deal found 9/11$290
This Frontier deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/29:27 pmISP - SJU
2 stops19h 27mFrontier
Thu 11/610:39 pmSJU - ISP
1 stop12h 58mFrontier
Deal found 9/10$292
This Frontier deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/114:58 pmISP - SJU
1 stop9h 32mFrontier
Sat 10/187:58 pmSJU - ISP
1 stop13h 01mFrontier
Deal found 9/11$294

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Islip to Puerto Rico that are best for you.

Fly from

Islip

Fly to

Puerto Rico

Route

Depart

Return

Price

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 10/30

6:37 pm-1:54 am

1 stop7h 17m

San Juan Luis Munoz Marin Intl

Sun 11/2

3:59 am-10:37 am

1 stop7h 38m

$254

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

Sat 11/1

7:30 am-9:02 am

1 stop25h 32m

$254

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 10/9

9:37 pm-2:30 am

1 stop28h 53m

San Juan Luis Munoz Marin Intl

Sun 10/12

3:40 am-10:37 am

1 stop6h 57m

$254

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 9/25

5:12 pm-3:22 pm

1 stop22h 10m

San Juan Luis Munoz Marin Intl

Thu 10/2

8:00 am-9:04 am

1 stop25h 04m

$254

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 10/31

4:58 pm-1:54 am

1 stop8h 56m

San Juan Luis Munoz Marin Intl

Sun 11/2

10:39 pm-10:37 am

1 stop12h 58m

$264

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 9/22

5:05 pm-2:34 am

1 stop9h 29m

San Juan Luis Munoz Marin Intl

Sat 9/27

3:39 am-10:40 am

1 stop7h 01m

$269

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 10/22

4:58 pm-2:30 am

1 stop9h 32m

San Juan Luis Munoz Marin Intl

Sat 10/25

7:58 pm-9:07 am

1 stop13h 09m

$269

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 10/31

4:58 pm-1:54 am

1 stop8h 56m

San Juan Luis Munoz Marin Intl

Sat 2/28

7:00 am-9:47 am

1 stop27h 47m

$269

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 10/24

9:49 am-11:29 pm

1 stop13h 40m

San Juan Luis Munoz Marin Intl

Tue 10/28

12:29 pm-10:37 am

1 stop22h 08m

$269

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 9/26

9:49 am-3:22 pm

1 stop29h 33m

San Juan Luis Munoz Marin Intl

Sat 9/27

3:39 am-10:40 am

1 stop7h 01m

$269

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 22 results
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Best time to book a flight from Islip to Puerto Rico

Have a flexible travel schedule? Discover the best time to fly to Puerto Rico from Islip with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Islip to Puerto Rico

What is the cheapest month to book a flight from Islip to Puerto Rico?

Currently, September is the cheapest month in which you can book a flight from Islip to Puerto Rico (average of $254). Flying from Islip to Puerto Rico in June is currently the most expensive (average of $339). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ISP to PR?

Find hourly flight availability from Islip to Puerto Rico. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Islip to Puerto Rico as you normally would.

Reviews of airlines servicing Puerto Rico

Get insights into the airlines that provide service to Puerto Rico. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Puerto Rico. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with Southwest, JetBlue, and Frontier from Islip to Puerto Rico by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
JetBlue
7.2
Good
2,913 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Food

7.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Islip to Puerto Rico. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to Puerto Rico?

    Islip Long Island (ISP), located 7.2 mi from the city center, is the airport you fly out of when you book flights from Islip to Puerto Rico.

  • How long is the flight from Islip to Puerto Rico?

    Departing from Islip to Puerto Rico will take you 7h 17m. Airlines will cover a distance of 1599 mi.

  • Can I find deals for flights from Islip to Puerto Rico that include hotel bookings?

    Yes. In addition to deals on Islip to Puerto Rico flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Puerto Rico?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Puerto Rico.

  • Can I find deals for business class flights from Islip to Puerto Rico?

    Yes. Cheapflights offers flight deals from Islip to Puerto Rico by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Islip to Puerto Rico?

    Currently, September is the cheapest month in which you can book a flight from Islip to Puerto Rico (average of $254). Flying from Islip to Puerto Rico in June is currently the most expensive (average of $339). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Islip to Puerto Rico

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Islip to Puerto Rico

Discover the top 3 airlines that operate flights from Islip to Puerto Rico. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$218FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$216Average$390FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$477Average$563FlexibilityNo cancel feeOn-time63%

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