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San Juan

$88+ 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 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Apr 23 — Apr 301
Thu 4/23
Thu 4/30
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 March 24, 2026.

This Frontier deal was found by Cheapflights users on 3/24. 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 4/278:31 pm
ISP
-
SJU
1 stop12h 59m
Frontier
Mon 5/43:03 am
SJU
-
ISP
1 stop7h 57m
Frontier
Deal found 3/24$176
This CheapOair deal was found by Cheapflights users on 3/20. 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.
Sun 4/127:59 pm
ISP
-
SJU
1 stop24h 01m
Frontier
Sat 4/188:00 am
SJU
-
ISP
1 stop25h 13m
Frontier
Deal found 3/20$186
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/44:07 pm
ISP
-
SJU
1 stop6h 41m
Frontier
Mon 5/43:03 am
SJU
-
ISP
1 stop7h 57m
Frontier
Deal found 3/20$191
This CheapOair deal was found by Cheapflights users on 3/24. 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 4/238:31 pm
ISP
-
SJU
1 stop26h 58m
Frontier
Sun 4/266:30 am
SJU
-
ISP
1 stop26h 58m
Frontier
Deal found 3/24$194
This CheapOair deal was found by Cheapflights users on 3/24. 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 5/611:00 am
ISP
-
SJU
1 stop11h 43m
Frontier
Fri 5/83:03 am
SJU
-
ISP
1 stop7h 02m
Frontier
Deal found 3/24$196
This Frontier deal was found by Cheapflights users on 3/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/34:07 pm
ISP
-
SJU
1 stop9h 54m
Frontier
Mon 5/47:15 am
SJU
-
ISP
1 stop12h 21m
Frontier
Deal found 3/20$199
This CheapOair deal was found by Cheapflights users on 3/24. 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 5/1311:00 am
ISP
-
SJU
1 stop15h 08m
Frontier
Sat 5/163:03 am
SJU
-
ISP
1 stop7h 02m
Frontier
Deal found 3/24$204
This CheapOair deal was found by Cheapflights users on 3/24. 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 5/1411:00 am
ISP
-
SJU
1 stop21h 04m
Frontier
Sun 5/173:03 am
SJU
-
ISP
1 stop7h 02m
Frontier
Deal found 3/24$212
This CheapOair deal was found by Cheapflights users on 3/24. 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 4/194:07 pm
ISP
-
SJU
1 stop17h 47m
Frontier
Tue 5/193:33 pm
SJU
-
ISP
1 stop18h 32m
Frontier
Deal found 3/24$214
This CheapOair deal was found by Cheapflights users on 3/20. 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.
Thu 4/304:07 pm
ISP
-
SJU
1 stop6h 49m
Frontier
Sun 5/36:30 am
SJU
-
ISP
1 stop26h 43m
Frontier
Deal found 3/20$224
This CheapOair deal was found by Cheapflights users on 3/20. 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.
Fri 5/2911:00 am
ISP
-
SJU
1 stop21h 04m
Frontier
Sun 5/316:09 pm
SJU
-
ISP
1 stop15h 56m
Frontier
Deal found 3/20$232
This CheapOair deal was found by Cheapflights users on 3/23. 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 4/66:40 pm
ISP
-
SJU
1 stop14h 38m
Frontier
Thu 4/94:40 pm
SJU
-
ISP
1 stop8h 46m
Frontier
Deal found 3/23$234

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 March 24, 2026.

Round-trip from

$176
(Frontier)

One-way from

$88
(CheapOair)

Popular in

February

Cheapest in

January

Average price

$582
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. 15% potential increase in price ($91 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($38 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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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 March 24, 2026.
Use the filters below to find and compare flights from Islip to San Juan that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 4/13

4:01 pm-11:29 pm

1 stop7h 28m

San Juan Luis Munoz Marin Intl

Thu 4/16

3:19 pm-9:13 am

1 stop17h 54m

$194

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sun 4/12

5:45 am-12:05 am

1 stop18h 20m

San Juan Luis Munoz Marin Intl

Thu 4/16

3:19 pm-9:13 am

1 stop17h 54m

$194

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 5/6

11:00 am-2:08 am

1 stop15h 08m

San Juan Luis Munoz Marin Intl

Wed 5/13

6:00 am-10:05 am

1 stop28h 05m

$196

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 5/13

11:00 am-2:08 am

1 stop15h 08m

San Juan Luis Munoz Marin Intl

Sun 5/17

6:09 pm-10:05 am

1 stop15h 56m

$204

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 5/1

4:07 pm-8:53 am

1 stop16h 46m

San Juan Luis Munoz Marin Intl

Mon 5/4

6:30 am-11:00 am

1 stop28h 30m

$212

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 5/1

8:31 pm-11:29 pm

1 stop26h 58m

San Juan Luis Munoz Marin Intl

Wed 5/6

6:00 am-10:05 am

1 stop28h 05m

$212

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 5/27

11:00 am-2:08 am

1 stop15h 08m

San Juan Luis Munoz Marin Intl

Sat 5/30

3:58 pm-10:05 am

1 stop18h 07m

$212

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 5/6

11:00 am-8:04 am

1 stop21h 04m

San Juan Luis Munoz Marin Intl

Sun 5/10

6:09 pm-10:05 am

1 stop15h 56m

$212

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 5/28

11:00 am-8:04 am

1 stop21h 04m

San Juan Luis Munoz Marin Intl

Mon 6/1

6:09 pm-5:17 pm

1 stop23h 08m

$212

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 6/15

10:48 am-1:54 am

1 stop15h 06m

San Juan Luis Munoz Marin Intl

Fri 6/19

6:16 pm-10:03 am

1 stop15h 47m

$406

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 19 resultsSorted by cheapest first
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, March is the cheapest month in which you can book a flight from Islip, New York to San Juan (average of $62). 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.

How much does it cost to fly round-trip from Islip, New York to San Juan?

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 March 24, 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
4,331 reviews

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,331 reviews
Southwest
8.0
Very good
4,331 reviews

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.7
Fair
3,017 reviews
Southwest
8.0
Very good
4,331 reviews

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Food

7.0

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 7h 28m. 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 $106, 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 78% 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, March is the cheapest month in which you can book a flight from Islip, New York to San Juan (average of $62). 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

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

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 March 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$106Average$281FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$367Average$535FlexibilityNo cancel feeOn-time63%

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