HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Luis Munoz Marin Intl

$143+ Cheap flights from Islip, NY (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 2/21. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Nov 26 — Dec 31
Wed 11/26
Wed 12/3
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to Luis Munoz Marin Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 October 27, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$263
(Booking.com)

One-way from

$143
(CheapOair)

Popular in

October

Cheapest in

February

Average price

$943
Provider with most accurate pricing for Islip Long Island-San Juan Luis Munoz Marin Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-San Juan Luis Munoz Marin Intl flights.
Search Deals
From Islip Long Island to San Juan Luis Munoz Marin Intl
Search Deals
One-way flight from Islip Long Island to San Juan Luis Munoz Marin Intl
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($99 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 11% potential price decrease ($45 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 27, 2025.

This Frontier deal was found by Cheapflights users on 10/26. 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.
Thu 11/2010:02 amISP - SJU
1 stop6h 55mFrontier
Sun 11/2310:22 pmSJU - ISP
1 stop10h 40mFrontier
Deal found 10/26$276
This Frontier deal was found by Cheapflights users on 10/26. 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 11/84:58 pmISP - SJU
1 stop8h 56mFrontier
Sat 11/154:14 pmSJU - ISP
2 stops16h 48mFrontier
Deal found 10/26$289
This CheapOair deal was found by Cheapflights users on 10/26. 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.
Fri 12/126:00 amISP - SJU
1 stop16h 56mFrontier
Fri 12/193:55 amSJU - ISP
1 stop15h 00mFrontier
Deal found 10/26$295
This CheapOair deal was found by Cheapflights users on 10/26. 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.
Thu 11/2010:02 amISP - SJU
1 stop6h 55mFrontier
Mon 11/2410:22 pmSJU - ISP
1 stop12h 56mFrontier
Deal found 10/26$296
This Frontier deal was found by Cheapflights users on 10/26. 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.
Wed 10/294:58 pmISP - SJU
1 stop8h 56mFrontier
Sun 11/210:39 pmSJU - ISP
1 stop12h 58mFrontier
Deal found 10/26$298
This Frontier deal was found by Cheapflights users on 10/26. 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.
Mon 11/104:58 pmISP - SJU
1 stop8h 56mFrontier
Sat 11/154:14 pmSJU - ISP
2 stops16h 48mFrontier
Deal found 10/26$307
This CheapOair deal was found by Cheapflights users on 10/27. 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.
Fri 12/56:00 amISP - SJU
1 stop16h 56mFrontier
Sat 12/68:00 amSJU - ISP
1 stop8h 10mFrontier
Deal found 10/27$311
This CheapOair deal was found by Cheapflights users on 10/25. 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 12/1310:19 amISP - SJU
1 stop15h 31mFrontier
Fri 12/193:55 amSJU - ISP
1 stop15h 00mFrontier
Deal found 10/25$315
This CheapOair deal was found by Cheapflights users on 10/26. 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.
Mon 11/34:58 pmISP - SJU
1 stop8h 56mFrontier
Sat 11/157:30 amSJU - ISP
1 stop25h 32mFrontier
Deal found 10/26$316
This Mytrip deal was found by Cheapflights users on 10/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/104:58 pmISP - SJU
1 stop8h 56mFrontier
Fri 11/144:31 pmSJU - ISP
2 stops40h 31mFrontier
Deal found 10/25$318

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 October 27, 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

Sat 1/10

3:34 pm-2:50 am

1 stop10h 16m

San Juan Luis Munoz Marin Intl

Wed 1/14

9:37 pm-11:12 am

1 stop14h 35m

$286

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 1/17

8:15 pm-2:25 pm

1 stop17h 10m

San Juan Luis Munoz Marin Intl

Thu 1/22

4:11 pm-10:40 am

2 stops19h 29m

$298

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 11/14

9:39 am-2:42 pm

1 stop28h 03m

San Juan Luis Munoz Marin Intl

Tue 11/18

12:29 pm-10:37 am

1 stop23h 08m

$316

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 1/17

12:15 pm-12:10 am

2 stops10h 55m

San Juan Luis Munoz Marin Intl

Thu 1/22

5:40 am-4:15 pm

2 stops11h 35m

$320

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 1/22

9:40 am-5:35 pm

1 stop6h 55m

San Juan Luis Munoz Marin Intl

Thu 1/29

6:00 am-11:35 am

1 stop6h 35m

$321

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 11/20

10:02 am-5:57 pm

1 stop6h 55m

San Juan Luis Munoz Marin Intl

Sat 11/22

3:59 am-10:09 am

1 stop7h 10m

$327

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 11/17

4:58 pm-2:54 am

1 stop8h 56m

San Juan Luis Munoz Marin Intl

Fri 11/21

6:10 am-11:59 pm

1 stop18h 49m

$336

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 11/8

4:58 pm-2:54 am

1 stop8h 56m

San Juan Luis Munoz Marin Intl

Fri 11/14

3:59 am-10:37 am

1 stop7h 38m

$342

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 1/15

3:34 pm-2:48 am

1 stop10h 14m

San Juan Luis Munoz Marin Intl

Sat 1/24

3:55 am-10:40 am

1 stop7h 45m

$346

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 2/21

7:41 pm-9:55 am

1 stop13h 14m

$143

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/24

Showing 1-10 of 17 results
1
2

Compare providers for flights from Islip to Luis Munoz Marin Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to Luis Munoz Marin Intl in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Islip, New York-San Juan Luis Munoz Marin Intl Airport flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Islip, New York-San Juan Luis Munoz Marin Intl Airport flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from Islip, New York-San Juan Luis Munoz Marin Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-San Juan Luis Munoz Marin Intl Airport flights, Cheapflights users trust Mytrip the most. Mytrip has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-San Juan Luis Munoz Marin Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, New York to San Juan Luis Munoz Marin Intl Airport?

Currently, February is the cheapest month in which you can book a flight from Islip, New York to San Juan Luis Munoz Marin Intl Airport (average of $59). Flying from Islip, New York to San Juan Luis Munoz Marin Intl Airport in August is currently the most expensive (average of $138). 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 October 27, 2025.

A simple way to save on the total cost of your ticket is to fly from Islip, New York 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 46% on your trip compared to booking a flight in the afternoon.

How much does it cost to fly round-trip from Islip, New York to San Juan Luis Munoz Marin Intl Airport?

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 October 27, 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
4,235 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

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
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

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
2,907 reviews
Southwest
8.0
Very good
4,235 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

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
3,122 reviews
Southwest
8.0
Very good
4,235 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

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, New York to San Juan Luis Munoz Marin Intl Airport?

    There are many flights that can get you from Islip, New York to San Juan Luis Munoz Marin Intl Airport in 6h 55m. Fly via Frontier, Southwest, or JetBlue to get the fastest option. There are 1599 mi between Islip, New York and San Juan Luis Munoz Marin Intl Airport. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    According to our current data, Frontier ($111), JetBlue ($216), and Southwest ($367) offers the cheapest pricing from Islip, New York to San Juan Luis Munoz Marin Intl Airport. Users have found that Frontier is 75% cheaper than the other options available to this destination.

  • 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, New York to San Juan Luis Munoz Marin Intl Airport?

    Currently, February is the cheapest month in which you can book a flight from Islip, New York to San Juan Luis Munoz Marin Intl Airport (average of $59). Flying from Islip, New York to San Juan Luis Munoz Marin Intl Airport in August is currently the most expensive (average of $138). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 October 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$218FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$216Average$344FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$382Average$535FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.