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San Juan

$109+ Cheap flights from Islip (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 8/30. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
ago. 25 — sep. 11
lun. 8/25
lun. 9/1
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 agosto 20, 2025.

Round-trip from

$218
(CheapOair)

One-way from

$109
(CheapOair)

Popular in

October

Cheapest in

November

Average price

$310
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. 7% potential increase in price ($34 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 August 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 agosto 20, 2025.

This CheapOair deal was found by Cheapflights users on 8/19. 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.
mar. 10/149:37 pmISP - SJU
1 stop14h 23mFrontier
mar. 10/211:17 pmSJU - ISP
1 stop7h 25mFrontier
Deal found 8/19$218
This CheapOair deal was found by Cheapflights users on 8/20. 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.
lun. 9/225:05 pmISP - SJU
1 stop27h 26mFrontier
sáb. 9/274:42 pmSJU - ISP
1 stop17h 58mFrontier
Deal found 8/20$228
This CheapOair deal was found by Cheapflights users on 8/19. 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.
vie. 9/195:05 pmISP - SJU
1 stop6h 54mFrontier
sáb. 9/203:39 amSJU - ISP
1 stop7h 01mFrontier
Deal found 8/19$238
This CheapOair deal was found by Cheapflights users on 8/19. 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.
sáb. 8/237:33 pmISP - SJU
1 stop13h 26mFrontier
sáb. 8/308:23 pmSJU - ISP
1 stop27h 36mFrontier
Deal found 8/19$258
This JetBlue deal was found by Cheapflights users on 8/18. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/291:57 pmISP - SJU
1 stop7h 07mJetBlue
mar. 11/47:00 amSJU - ISP
1 stop7h 02mJetBlue
Deal found 8/18$267
This CheapOair deal was found by Cheapflights users on 8/19. 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.
mar. 8/266:05 amISP - SJU
1 stop13h 03mFrontier
jue. 9/44:42 pmSJU - ISP
1 stop17h 58mFrontier
Deal found 8/19$268
This CheapOair deal was found by Cheapflights users on 8/19. 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.
vie. 8/299:58 amISP - SJU
1 stop16h 52mFrontier
mar. 9/28:13 pmSJU - ISP
1 stop27h 28mFrontier
Deal found 8/19$278
This CheapOair deal was found by Cheapflights users on 8/18. 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.
mar. 9/1611:25 amISP - SJU
1 stop15h 09mFrontier
vie. 9/193:39 amSJU - ISP
1 stop7h 16mFrontier
Deal found 8/18$284
This Priceline deal was found by Cheapflights users on 8/17. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/195:05 pmISP - SJU
1 stop9h 29mFrontier
lun. 9/224:42 pmSJU - ISP
1 stop17h 58mFrontier
Deal found 8/17$285
This Cheapflightsfares deal was found by Cheapflights users on 8/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/205:05 pmISP - SJU
1 stop6h 54mFrontier
mié. 9/243:39 amSJU - ISP
1 stop7h 16mFrontier
Deal found 8/17$288
This Cheapflightsfares deal was found by Cheapflights users on 8/18. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 8/307:33 pmISP - SJU
1 stop7h 17mFrontier
jue. 9/43:39 amSJU - ISP
1 stop7h 01mFrontier
Deal found 8/18$290
This Cheapflightsfares deal was found by Cheapflights users on 8/19. 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.
sáb. 9/65:05 pmISP - SJU
1 stop6h 54mFrontier
mar. 9/93:39 amSJU - ISP
1 stop7h 01mFrontier
Deal found 8/19$291

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 agosto 20, 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

mié. 10/15

4:58 pm-2:30 am

1 stop9h 32m

San Juan Luis Munoz Marin Intl

lun. 10/27

3:04 am-5:42 pm

1 stop14h 38m

$218

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

mar. 10/14

9:37 pm-12:00 pm

1 stop14h 23m

San Juan Luis Munoz Marin Intl

mar. 10/21

1:17 pm-8:42 pm

1 stop7h 25m

$218

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

mié. 9/17

11:35 am-2:34 am

1 stop14h 59m

San Juan Luis Munoz Marin Intl

lun. 9/22

3:39 am-10:40 am

1 stop7h 01m

$218

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

mar. 9/23

11:25 am-2:34 am

1 stop15h 09m

San Juan Luis Munoz Marin Intl

lun. 9/29

3:39 am-10:40 am

1 stop7h 01m

$218

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

mié. 9/24

11:35 am-2:34 am

1 stop14h 59m

San Juan Luis Munoz Marin Intl

dom. 9/28

3:39 am-10:40 am

1 stop7h 01m

$228

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

lun. 9/22

5:05 pm-8:31 pm

1 stop27h 26m

San Juan Luis Munoz Marin Intl

sáb. 9/27

4:42 pm-10:40 am

1 stop17h 58m

$228

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

dom. 9/21

11:25 am-2:34 am

1 stop15h 09m

San Juan Luis Munoz Marin Intl

sáb. 9/27

8:00 am-4:23 pm

1 stop8h 23m

$228

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

sáb. 9/27

5:05 pm-2:34 am

1 stop9h 29m

San Juan Luis Munoz Marin Intl

dom. 9/28

4:42 pm-10:40 am

1 stop17h 58m

$228

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

mar. 9/23

11:25 am-2:34 am

1 stop15h 09m

$109

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

sáb. 11/15

4:58 pm-11:19 am

1 stop17h 21m

$109

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/19

Showing 1-10 of 17 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 to San Juan?

Currently, September is the cheapest month in which you can book a flight from Islip to San Juan (average of $254). Flying from Islip to San Juan 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 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 agosto 20, 2025.

A simple way to save on the total cost of your ticket is to fly from Islip to San Juan 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 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 agosto 20, 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
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
JetBlue
7.2
Good
2,916 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,207 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Boarding

8.1

Crew

8.6

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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 to San Juan?

    There are many flights that can get you from Islip to San Juan in 9h 32m. Fly via Frontier to get the fastest option. The distance from Islip to San Juan is about 1599 mi.

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

    Frontier, at $59, was found to be the cheapest airline from Islip to San Juan.Alternate airlines to your destination round-trip include JetBlue and Southwest. Frontier is priced at 86% lower than the current average price of a flight leaving 3 months from now.

  • 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 to San Juan?

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

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Alternative routes for Islip to San Juan

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 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 agosto 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$213FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$231Average$480FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$477Average$563FlexibilityNo cancel feeOn-time63%

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