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$137+ 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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
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 October 28, 2025.

Round-trip from

$263
(Booking.com)

One-way from

$137
(JetBlue)

Popular in

October

Cheapest in

February

Average price

$943
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. 18% potential increase in price ($99 potential increase over avg. RT price).
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Cheapest flight prices on average. 11% potential price decrease ($45 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 28, 2025.

This Frontier deal was found by Cheapflights users on 10/26. 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.
Thu 11/2010:02 amISP - SJU
1 stop6h 55mFrontier
Sun 11/2310:22 pmSJU - ISP
1 stop10h 40mFrontier
Deal found 10/26$276
This Frontier deal was found by Cheapflights users on 10/26. 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.
Sat 11/84:58 pmISP - SJU
1 stop8h 56mFrontier
Sat 11/154:14 pmSJU - ISP
2 stops16h 48mFrontier
Deal found 10/26$289
This Frontier deal was found by Cheapflights users on 10/28. 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 11/174:58 pmISP - SJU
1 stop8h 56mFrontier
Sun 11/237:11 amSJU - ISP
2 stops16h 38mFrontier
Deal found 10/28$290
This CheapOair deal was found by Cheapflights users on 10/28. 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 12/58:29 pmISP - SJU
1 stop29h 21mFrontier
Mon 12/87:25 amSJU - ISP
1 stop17h 34mFrontier
Deal found 10/28$291
This CheapOair deal was found by Cheapflights users on 10/26. 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 12/126:00 amISP - SJU
1 stop16h 56mFrontier
Fri 12/193:55 amSJU - ISP
1 stop15h 00mFrontier
Deal found 10/26$295
This CheapOair deal was found by Cheapflights users on 10/28. 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 11/2010:02 amISP - SJU
1 stop6h 55mFrontier
Mon 11/2410:22 pmSJU - ISP
1 stop12h 56mFrontier
Deal found 10/28$296
This Frontier deal was found by Cheapflights users on 10/26. 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.
Wed 10/294:58 pmISP - SJU
1 stop8h 56mFrontier
Sun 11/210:39 pmSJU - ISP
1 stop12h 58mFrontier
Deal found 10/26$300
This Frontier deal was found by Cheapflights users on 10/26. 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 11/104:58 pmISP - SJU
1 stop8h 56mFrontier
Sat 11/154:14 pmSJU - ISP
2 stops16h 48mFrontier
Deal found 10/26$307
This CheapOair deal was found by Cheapflights users on 10/27. 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
Sat 12/68:00 amSJU - ISP
1 stop8h 10mFrontier
Deal found 10/27$311
This Mytrip deal was found by Cheapflights users on 10/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/104:58 pmISP - SJU
1 stop8h 56mFrontier
Fri 11/144:31 pmSJU - ISP
2 stops40h 31mFrontier
Deal found 10/25$318

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 October 28, 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

Wed 1/21

9:40 am-6:35 pm

1 stop7h 55m

San Juan Luis Munoz Marin Intl

Thu 1/22

6:00 am-11:35 am

1 stop6h 35m

$268

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 11/8

4:58 pm-2:54 am

1 stop8h 56m

San Juan Luis Munoz Marin Intl

Sat 11/15

4:14 pm-8:02 am

2 stops16h 48m

$289

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 11/20

10:02 am-5:57 pm

1 stop6h 55m

San Juan Luis Munoz Marin Intl

Mon 11/24

10:22 pm-10:18 am

1 stop12h 56m

$296

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 12/5

8:29 pm-2:50 am

1 stop29h 21m

San Juan Luis Munoz Marin Intl

Mon 12/8

4:24 pm-11:59 pm

1 stop8h 35m

$316

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 1/17

12:15 pm-12:10 am

2 stops10h 55m

San Juan Luis Munoz Marin Intl

Thu 1/22

5:40 am-4:15 pm

2 stops11h 35m

$320

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 1/22

9:40 am-5:35 pm

1 stop6h 55m

San Juan Luis Munoz Marin Intl

Thu 1/29

6:00 am-11:35 am

1 stop6h 35m

$321

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 11/20

10:02 am-5:57 pm

1 stop6h 55m

San Juan Luis Munoz Marin Intl

Sat 11/22

3:59 am-10:09 am

1 stop7h 10m

$327

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 12/12

6:00 am-11:56 pm

1 stop16h 56m

San Juan Luis Munoz Marin Intl

Sat 12/20

5:22 pm-11:59 pm

1 stop7h 37m

$331

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 12/12

6:00 am-11:56 pm

1 stop16h 56m

San Juan Luis Munoz Marin Intl

Sun 12/21

6:00 am-1:09 pm

1 stop8h 09m

$331

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 11/17

4:58 pm-2:54 am

1 stop8h 56m

San Juan Luis Munoz Marin Intl

Sun 11/23

10:22 pm-8:02 am

1 stop10h 40m

$336

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/27

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 October 28, 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.

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 October 28, 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
4,238 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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
2,907 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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
3,124 reviews
Southwest
8.0
Very good
4,238 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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 7h 55m. Airlines will cover a distance of 1599 mi. This flight may include one or multiple stops.

  • 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 October 28, 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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