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$69+ Cheap flights from Islip, NY (ISP) to San Juan

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
Dec 18 — Dec 251
Thu 12/18
Thu 12/25
1 adult, Economy
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Cheap flight deals from Islip to San Juan

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to San Juan (PR1). 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 November 18, 2025.

Round-trip from

$138
(CheapOair)

One-way from

$69
(CheapOair)

Popular in

October

Cheapest in

February

Average price

$323
From Islip Long Island to San Juan
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One-way flight from Islip Long Island to San Juan
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Highest demand for flights based on searches. 20% potential increase in price ($119 potential increase over avg. RT price).
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Cheapest flight prices on average. 10% potential price decrease ($45 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find flight deals from Islip to San Juan

Cheapest flights from Islip to San Juan
Explore the most affordable flight options available from Islip to San Juan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 18, 2025.

This CheapOair deal was found by Cheapflights users on 11/17. 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 12/410:19 amISP - SJU
1 stop15h 31mFrontier
Sat 12/63:55 amSJU - ISP
1 stop7h 25mFrontier
Deal found 11/17$168
This CheapOair deal was found by Cheapflights users on 11/17. 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 stop22h 36mFrontier
Thu 12/1810:08 amSJU - ISP
1 stop14h 23mFrontier
Deal found 11/17$227
This CheapOair deal was found by Cheapflights users on 11/17. 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 12/36:00 amISP - SJU
1 stop19h 50mFrontier
Sat 12/63:55 amSJU - ISP
1 stop7h 25mFrontier
Deal found 11/17$231
This CheapOair deal was found by Cheapflights users on 11/18. 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 12/711:15 amISP - SJU
1 stop21h 40mFrontier
Mon 12/83:55 amSJU - ISP
1 stop16h 39mFrontier
Deal found 11/18$251
This CheapOair deal was found by Cheapflights users on 11/17. 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
Tue 12/93:55 amSJU - ISP
1 stop19h 49mFrontier
Deal found 11/17$266
This Kiwi.com deal was found by Cheapflights users on 11/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/28:29 pmISP - SJU
2 stops22h 58mMultiple Airlines
Sat 12/68:00 amSJU - ISP
1 stop8h 10mMultiple Airlines
Deal found 11/16$275
This Kiwi.com deal was found by Cheapflights users on 11/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/28:29 pmISP - SJU
1 stop29h 21mFrontier
Sat 12/68:00 amSJU - ISP
1 stop8h 10mFrontier
Deal found 11/16$293
This CheapOair deal was found by Cheapflights users on 11/17. 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 12/106:00 amISP - SJU
1 stop19h 50mFrontier
Tue 12/163:55 amSJU - ISP
1 stop19h 49mFrontier
Deal found 11/17$294
This CheapOair deal was found by Cheapflights users on 11/18. 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 1/2611:15 amSJU - ISP
1 stop8h 33mFrontier
Deal found 11/18$316
This CheapOair deal was found by Cheapflights users on 11/18. 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 12/106:00 amISP - SJU
1 stop26h 55mFrontier
Sun 12/216:48 pmSJU - ISP
1 stop25h 52mFrontier
Deal found 11/18$326

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to San Juan 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 November 18, 2025.
Use the filters below to find and compare flights from Islip to San Juan that are best for you.

Fly from

Islip

Fly to

San Juan

Route

Depart

Return

Price

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 2/23

1:10 pm-11:37 pm

1 stop9h 27m

San Juan Luis Munoz Marin Intl

Thu 2/26

3:55 am-4:06 pm

1 stop13h 11m

$153

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 2/25

7:41 pm-9:55 am

1 stop13h 14m

San Juan Luis Munoz Marin Intl

Sat 2/28

3:55 am-9:47 am

1 stop6h 52m

$168

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 1/19

8:54 pm-3:26 pm

1 stop17h 32m

San Juan Luis Munoz Marin Intl

Wed 1/28

4:36 pm-6:48 pm

1 stop27h 12m

$212

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 2/20

5:03 pm-2:50 am

1 stop8h 47m

San Juan Luis Munoz Marin Intl

Fri 2/27

3:55 am-10:40 am

1 stop7h 45m

$216

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 12/11

10:19 am-9:55 am

1 stop22h 36m

San Juan Luis Munoz Marin Intl

Thu 12/18

10:08 am-11:31 pm

1 stop14h 23m

$227

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 12/3

6:00 am-2:50 am

1 stop19h 50m

San Juan Luis Munoz Marin Intl

Sat 12/6

3:55 am-10:20 am

1 stop7h 25m

$231

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sun 12/7

12:07 pm-2:54 pm

1 stop25h 47m

San Juan Luis Munoz Marin Intl

Mon 1/26

11:15 am-6:48 pm

1 stop8h 33m

$251

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 12/4

10:19 am-2:50 am

1 stop15h 31m

San Juan Luis Munoz Marin Intl

Sun 12/7

11:05 am-9:13 am

1 stop23h 08m

$296

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sun 2/8

7:53 pm-11:51 pm

1 stop26h 58m

San Juan Luis Munoz Marin Intl

Sat 2/14

3:55 am-4:06 pm

1 stop13h 11m

$316

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sun 1/25

11:50 am-12:40 am

2 stops11h 50m

San Juan Luis Munoz Marin Intl

Thu 1/29

5:40 am-4:15 pm

2 stops11h 35m

$320

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/17

Showing 1-10 of 21 results
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Best time to book a flight from Islip to San Juan

Have a flexible travel schedule? Discover the best time to fly to San Juan 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

What is the cheapest month to book a flight from Islip, New York to San Juan?

Currently, February is the cheapest month in which you can book a flight from Islip, New York to San Juan (average of $59). Flying from Islip, New York to San Juan 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 San Juan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 18, 2025.

A simple way to save on the total cost of your ticket is to fly from Islip, New York to San Juan in the evening. If you’re flexible enough to do this you can expect to save up to 52% on your trip compared to booking a flight in the morning.

Reviews of airlines servicing San Juan

Get insights into the airlines that provide service to San Juan. 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 San Juan. Reviews last updated November 18, 2025.
Peruse reviews from past customers who have flown with Southwest, JetBlue, and Frontier from Islip to San Juan to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

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
2,903 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

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
3,105 reviews
Southwest
8.0
Very good
4,248 reviews

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

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 San Juan. 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?

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

  • How long is the flight from Islip, New York to San Juan?

    Departing from Islip, New York to San Juan will take you 9h 27m. Airlines will cover a distance of 1599 mi.

  • What are the cheapest airlines flying from Islip, New York to San Juan round-trip?

    Currently priced at $111, Frontier will fly you from Islip, New York to San Juan and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from JetBlue and Southwest - these airlines can fly you to your destination from $216 and $367, respectively. Frontier is currently priced 75% below the average price you’ll pay for this route.

  • Can I find deals for flights from Islip to San Juan that include hotel bookings?

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

  • How can I find direct flights from Islip to San Juan?

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

  • Can I find deals for business class flights from Islip to San Juan?

    Yes. Cheapflights offers flight deals from Islip to San Juan 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?

    Currently, February is the cheapest month in which you can book a flight from Islip, New York to San Juan (average of $59). Flying from Islip, New York to San Juan 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

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Alternative routes for Islip to San Juan

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Top 3 airlines flying from Islip to San Juan

Discover the top 3 airlines that operate flights from Islip to San Juan. 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 November 18, 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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