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Luis Munoz Marin Intl

$127+ Cheap flights from Islip (ISP) to Luis Munoz Marin Intl (SJU)

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 9/16. 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 Luis Munoz Marin Intl

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Luis Munoz Marin Intl (SJU). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$253
(Cheapflightsfares)

One-way from

$127
(CheapOair)

Popular in

October

Cheapest in

November

Average price

$463
From Islip Long Island to San Juan Luis Munoz Marin Intl
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One-way flight from Islip Long Island to San Juan Luis Munoz Marin Intl
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Highest demand for flights based on searches. 4% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($25 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 Luis Munoz Marin Intl

Cheapest flights from Islip to Luis Munoz Marin Intl
Explore the most affordable flight options available from Islip to Luis Munoz Marin Intl. 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 Luis Munoz Marin Intl 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 San Juan Luis Munoz Marin Intl Airport that are best for you.

Fly from

Islip

Fly to

Luis Munoz Marin Intl

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 Luis Munoz Marin Intl

Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl 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 San Juan Luis Munoz Marin Intl Airport

What is the cheapest month to book a flight from Islip to San Juan Luis Munoz Marin Intl Airport?

Currently, September is the cheapest month in which you can book a flight from Islip to San Juan Luis Munoz Marin Intl Airport (average of $254). Flying from Islip to San Juan Luis Munoz Marin Intl Airport 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 SJU?

Find hourly flight availability from Islip to Luis Munoz Marin Intl. 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.

A simple way to save on the total cost of your ticket is to fly from Islip to San Juan Luis Munoz Marin Intl Airport in the evening. If you’re flexible enough to do this you can expect to save up to 47% on your trip compared to booking a flight in the afternoon.

Reviews of airlines servicing Luis Munoz Marin Intl

Get insights into the airlines that provide service to Luis Munoz Marin Intl. 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 Luis Munoz Marin Intl. Reviews last updated September 11, 2025.
Read through reviews of airlines operating flights from Islip to San Juan Luis Munoz Marin Intl Airport, such as Southwest, JetBlue, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

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

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

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

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

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

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

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 Luis Munoz Marin Intl. 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 San Juan Luis Munoz Marin Intl?

    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 San Juan Luis Munoz Marin Intl. 3 airlines have flights from Long Island to San Juan Luis Munoz Marin Intl on a regular basis. Booking flights from Islip Long Island to San Juan Luis Munoz Marin Intl should not be difficult; the airport handles an average of 0 outbound flights to San Juan Luis Munoz Marin Intl per day.

  • How long is the flight from Islip to San Juan Luis Munoz Marin Intl Airport?

    A quick flight from Islip to San Juan Luis Munoz Marin Intl Airport can take about 7h 17m. Frontier provides one of the quickest options available for as low as $254. There are 1599 mi between Islip and San Juan Luis Munoz Marin Intl Airport.

  • What are the cheapest airlines flying from Islip to San Juan Luis Munoz Marin Intl Airport round-trip?

    Cheapflights users have booked flights from Islip to San Juan Luis Munoz Marin Intl Airport round-trip from $59. Other airlines that can offer you cheap pricing are JetBlue, from $216, and Southwest, from $477. These flights start at 86% lower than the current average price 3 months from now.

  • Can I find deals for flights from Islip to Luis Munoz Marin Intl that include hotel bookings?

    Yes. In addition to deals on Islip to Luis Munoz Marin Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Luis Munoz Marin Intl?

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

  • Can I find deals for business class flights from Islip to Luis Munoz Marin Intl?

    Yes. Cheapflights offers flight deals from Islip to Luis Munoz Marin Intl 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 San Juan Luis Munoz Marin Intl Airport?

    Currently, September is the cheapest month in which you can book a flight from Islip to San Juan Luis Munoz Marin Intl Airport (average of $254). Flying from Islip to San Juan Luis Munoz Marin Intl Airport 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

Traveling to a place near San Juan Luis Munoz Marin Intl Airport?

Book flights to San Juan Luis Munoz Marin Intl Airport if you plan to visit one of these locations
Dorado
Fajardo
Rio Grande
Luquillo
Humacao

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Islip to Luis Munoz Marin Intl

Discover the top 3 airlines that operate flights from Islip to Luis Munoz Marin Intl. 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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