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San Juan

$87+ 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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Mar 10 — Mar 171
Tue 3/10
Tue 3/17
1 adult, Economy
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Cheap 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 February 8, 2026.

This CheapOair deal was found by Cheapflights users on 2/6. 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 2/2812:01 pm
ISP
-
SJU
1 stop11h 42m
Frontier
Tue 3/35:25 pm
SJU
-
ISP
1 stop16h 15m
Frontier
Deal found 2/6$174
This CheapOair deal was found by Cheapflights users on 2/7. 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 2/263:34 pm
ISP
-
SJU
1 stop10h 19m
Frontier
Tue 3/35:25 pm
SJU
-
ISP
1 stop16h 15m
Frontier
Deal found 2/7$183
This Frontier deal was found by Cheapflights users on 2/7. 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 2/233:59 pm
ISP
-
SJU
1 stop7h 44m
Frontier
Wed 2/253:53 am
SJU
-
ISP
1 stop11h 46m
Frontier
Deal found 2/7$192
This CheapOair deal was found by Cheapflights users on 2/5. 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 2/2111:41 am
ISP
-
SJU
1 stop14h 12m
Frontier
Sat 2/285:25 pm
SJU
-
ISP
1 stop15h 23m
Frontier
Deal found 2/5$213
This CheapOair deal was found by Cheapflights users on 2/6. 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 4/95:30 am
ISP
-
SJU
1 stop18h 35m
Frontier
Thu 4/166:30 am
SJU
-
ISP
1 stop26h 43m
Frontier
Deal found 2/6$217
This CheapOair deal was found by Cheapflights users on 2/5. 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 5/74:07 pm
ISP
-
SJU
1 stop9h 54m
Frontier
Sun 5/106:30 am
SJU
-
ISP
1 stop26h 43m
Frontier
Deal found 2/5$227
This CheapOair deal was found by Cheapflights users on 2/6. 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 2/195:07 pm
ISP
-
SJU
1 stop8h 18m
Frontier
Fri 2/273:53 am
SJU
-
ISP
1 stop16h 35m
Frontier
Deal found 2/6$234
This Frontier deal was found by Cheapflights users on 2/4. 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 2/233:59 pm
ISP
-
SJU
1 stop7h 44m
Frontier
Thu 2/263:53 am
SJU
-
ISP
1 stop11h 46m
Frontier
Deal found 2/4$237
This CheapOair deal was found by Cheapflights users on 2/6. 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 4/234:07 pm
ISP
-
SJU
1 stop17h 47m
Frontier
Sun 4/263:19 pm
SJU
-
ISP
1 stop17h 54m
Frontier
Deal found 2/6$247
This CheapOair deal was found by Cheapflights users on 2/5. 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 2/225:07 pm
ISP
-
SJU
1 stop8h 22m
Frontier
Wed 2/255:25 pm
SJU
-
ISP
1 stop22h 14m
Frontier
Deal found 2/5$248
This CheapOair deal was found by Cheapflights users on 2/7. 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 4/88:30 am
ISP
-
SJU
1 stop23h 26m
Frontier
Sat 4/188:00 am
SJU
-
ISP
1 stop25h 13m
Frontier
Deal found 2/7$254
This CheapOair deal was found by Cheapflights users on 2/7. 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 3/22:17 pm
ISP
-
SJU
1 stop11h 08m
Frontier
Fri 3/65:30 am
SJU
-
ISP
1 stop29h 18m
Frontier
Deal found 2/7$256

Find 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 February 8, 2026.

Round-trip from

$174
(CheapOair)

One-way from

$87
(CheapOair)

Popular in

October

Cheapest in

February

Average price

$182
From Islip Long Island to San Juan
Search Deals
One-way flight from Islip Long Island to San Juan
Search Deals
Highest demand for flights based on searches. 24% potential increase in price ($139 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 11% potential price decrease ($47 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 8, 2026.
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

Sat 2/28

8:23 pm-2:53 am

1 stop29h 30m

San Juan Luis Munoz Marin Intl

Mon 3/2

3:53 am-8:40 am

1 stop29h 47m

$174

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 2/26

3:34 pm-12:43 am

1 stop8h 09m

San Juan Luis Munoz Marin Intl

Tue 3/3

5:25 pm-8:40 am

1 stop16h 15m

$183

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 4/13

4:01 pm-2:06 pm

1 stop22h 05m

San Juan Luis Munoz Marin Intl

Sat 4/18

11:07 am-9:13 am

1 stop22h 06m

$192

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 2/19

3:34 pm-2:53 am

1 stop10h 19m

San Juan Luis Munoz Marin Intl

Wed 2/25

3:53 am-2:39 pm

1 stop11h 46m

$192

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 4/11

5:02 pm-7:56 am

1 stop14h 54m

San Juan Luis Munoz Marin Intl

Sat 4/18

8:00 am-9:13 am

1 stop25h 13m

$192

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 2/23

3:59 pm-12:43 am

1 stop7h 44m

San Juan Luis Munoz Marin Intl

Wed 2/25

3:53 am-2:39 pm

1 stop11h 46m

$192

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 4/11

7:15 am-8:49 pm

1 stop13h 34m

San Juan Luis Munoz Marin Intl

Thu 4/16

6:30 am-9:13 am

1 stop26h 43m

$192

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 2/19

3:34 pm-2:53 am

1 stop10h 19m

San Juan Luis Munoz Marin Intl

Mon 2/23

3:53 am-8:40 am

1 stop29h 47m

$213

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 2/21

11:41 am-2:53 am

1 stop14h 12m

San Juan Luis Munoz Marin Intl

Sat 2/28

5:25 pm-7:48 am

1 stop15h 23m

$213

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 2/23

3:59 pm-12:43 am

1 stop7h 44m

San Juan Luis Munoz Marin Intl

Thu 2/26

3:53 am-2:39 pm

1 stop11h 46m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/5

Showing 1-10 of 15 results
1
2

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.

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 February 8, 2026.
Peruse reviews from past customers who have flown with Southwest 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
4,280 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

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
8.0
Very good
4,280 reviews
Southwest
8.0
Very good
4,280 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

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
5.7
Fair
3,052 reviews
Southwest
8.0
Very good
4,280 reviews

Food

7.0

Comfort

8.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

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 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. 2 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 29h 30m. 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 $59, 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. Check Cheapflights for deals on Southwest for as low as $367. Frontier is currently priced 86% 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

Browse thousands of different options on Cheapflights for your next trip

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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 2 airlines flying from Islip to San Juan

Discover the top 2 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 February 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$218FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$367Average$535FlexibilityNo cancel feeOn-time63%

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