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Luis Munoz Marin Intl

$90+ 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 2/9. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap 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 December 12, 2025.

This CheapOair deal was found by Cheapflights users on 12/10. 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 12/1712:37 pmISP - SJU
1 stop19h 21mFrontier
Wed 12/245:09 pmSJU - ISP
1 stop19h 16mFrontier
Deal found 12/10$205
This CheapOair deal was found by Cheapflights users on 12/10. 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.
Mon 12/1510:19 amISP - SJU
1 stop15h 31mFrontier
Sat 12/209:58 pmSJU - ISP
1 stop22h 42mFrontier
Deal found 12/10$244
This Priceline deal was found by Cheapflights users on 12/11. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1712:37 pmISP - SJU
1 stop19h 21mFrontier
Tue 12/233:00 pmSJU - ISP
1 stop9h 59mFrontier
Deal found 12/11$245
This CheapOair deal was found by Cheapflights users on 12/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/191:27 pmISP - SJU
1 stop18h 27mFrontier
Tue 12/233:00 pmSJU - ISP
1 stop9h 59mFrontier
Deal found 12/11$260
This CheapOair deal was found by Cheapflights users on 12/10. 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.
Thu 12/1110:19 amISP - SJU
1 stop15h 31mFrontier
Thu 12/189:37 pmSJU - ISP
1 stop23h 03mFrontier
Deal found 12/10$264
This CheapOair deal was found by Cheapflights users on 12/10. 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 12/315:27 pmISP - SJU
1 stop14h 56mFrontier
Sat 1/314:36 pmSJU - ISP
1 stop17h 04mFrontier
Deal found 12/10$268
This CheapOair deal was found by Cheapflights users on 12/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1510:19 amISP - SJU
1 stop15h 31mFrontier
Thu 12/183:55 amSJU - ISP
1 stop9h 47mFrontier
Deal found 12/11$269
This CheapOair deal was found by Cheapflights users on 12/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1712:37 pmISP - SJU
1 stop19h 21mFrontier
Thu 12/183:55 amSJU - ISP
1 stop9h 47mFrontier
Deal found 12/11$271
This CheapOair deal was found by Cheapflights users on 12/10. 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 12/1310:19 amISP - SJU
1 stop22h 36mFrontier
Mon 12/155:09 pmSJU - ISP
1 stop27h 25mFrontier
Deal found 12/10$283
This CheapOair deal was found by Cheapflights users on 12/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/212:04 pmISP - SJU
1 stop18h 19mFrontier
Wed 12/249:37 pmSJU - ISP
1 stop14h 48mFrontier
Deal found 12/11$285
This CheapOair deal was found by Cheapflights users on 12/10. 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.
Sun 12/1411:15 amISP - SJU
1 stop14h 35mFrontier
Mon 12/153:55 amSJU - ISP
1 stop16h 39mFrontier
Deal found 12/10$299

Find 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 December 12, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$180
(Frontier)

One-way from

$90
(Frontier)

Popular in

October

Cheapest in

February

Average price

$673
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. 21% potential increase in price ($121 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($44 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 12, 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

7:56 pm-8:54 am

1 stop11h 58m

San Juan Luis Munoz Marin Intl

Wed 1/14

7:34 pm-8:55 am

1 stop14h 21m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 1/10

7:56 pm-8:54 am

1 stop11h 58m

San Juan Luis Munoz Marin Intl

Tue 1/13

7:21 pm-10:46 pm

1 stop28h 25m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 1/5

6:25 am-12:54 am

1 stop17h 29m

San Juan Luis Munoz Marin Intl

Mon 1/12

9:23 pm-10:46 pm

1 stop26h 23m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 2/21

8:23 pm-12:54 am

1 stop27h 31m

San Juan Luis Munoz Marin Intl

Tue 2/24

5:25 pm-1:13 pm

1 stop20h 48m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 1/8

8:40 pm-8:54 am

1 stop11h 14m

San Juan Luis Munoz Marin Intl

Mon 1/12

9:23 pm-10:46 pm

1 stop26h 23m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 2/21

8:23 pm-12:54 am

1 stop27h 31m

San Juan Luis Munoz Marin Intl

Wed 2/25

2:07 pm-2:39 pm

1 stop25h 32m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 1/1

6:00 am-8:58 am

1 stop25h 58m

San Juan Luis Munoz Marin Intl

Sat 1/31

8:00 am-8:40 am

1 stop25h 40m

$193

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 1/17

6:47 pm-2:23 pm

1 stop18h 36m

San Juan Luis Munoz Marin Intl

Sat 1/31

4:36 pm-8:40 am

1 stop17h 04m

$200

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 1/10

7:56 pm-8:54 am

1 stop11h 58m

San Juan Luis Munoz Marin Intl

Fri 1/16

3:58 am-10:46 pm

1 stop19h 48m

$200

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sun 2/22

5:03 pm-9:55 am

1 stop15h 52m

San Juan Luis Munoz Marin Intl

Tue 3/3

7:00 am-10:40 am

1 stop28h 40m

$216

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Showing 1-10 of 22 results
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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 December.
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 December 12, 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.

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 December 12, 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
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
JetBlue
7.2
Good
2,899 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,084 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Crew

8.6

Overall

7.9

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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 11h 58m. Fly via Frontier to get the fastest option. There are 1599 mi between Islip, New York and San Juan Luis Munoz Marin Intl Airport.

  • 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 ($59), 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 87% 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
Humacao
Luquillo
Bayamón

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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$111Average$220FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$216Average$344FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$367Average$535FlexibilityNo cancel feeOn-time63%

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