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$84+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Jul 5 — Jul 121
Sat 7/5
Sat 7/12
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 June 30, 2025.

Round-trip from

$213
(CheapOair)

One-way from

$84
(CheapOair)

Popular in

October

Cheapest in

November

Average price

$625
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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High demand for flights, 4% potential price rise
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Cheapest flight prices on average. 6% potential price decrease ($26 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 30, 2025.

This CheapOair deal was found by Cheapflights users on 6/29. 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.
Tue 7/158:00 amISP - SJU
1 stop18h 39mFrontier
Fri 7/2510:04 amSJU - ISP
1 stop9h 38mFrontier
Deal found 6/29$213
This JetBlue deal was found by Cheapflights users on 6/28. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/512:15 pmISP - SJU
1 stop6h 50mJetBlue
Tue 11/115:05 amSJU - ISP
1 stop7h 13mJetBlue
Deal found 6/28$346

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 June 30, 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

Tue 7/15

8:00 am-2:39 am

1 stop18h 39m

San Juan Luis Munoz Marin Intl

Fri 7/25

10:04 am-7:42 pm

1 stop9h 38m

$213

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 7/23

12:35 pm-11:12 pm

1 stop10h 37m

San Juan Luis Munoz Marin Intl

Fri 7/25

5:01 am-12:00 pm

1 stop6h 59m

$362

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 8/25

7:27 pm-2:50 am

1 stop7h 23m

$84

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 9/1

1:21 pm-8:50 pm

1 stop7h 29m

$186

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 7/11

2:40 pm-12:55 am

2 stops10h 15m

$318

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 7/11

10:36 am-9:37 pm

3 stops35h 01m

$439

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

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, September is the cheapest month in which you can book a flight from Islip, New York to San Juan (average of $254). Flying from Islip, New York 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 June 30, 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 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 June 30, 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
4,278 reviews

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,278 reviews
Southwest
8.0
Very good
4,278 reviews

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
JetBlue
7.3
Good
2,920 reviews
Southwest
8.0
Very good
4,278 reviews

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Frontier
5.9
Fair
3,290 reviews
Southwest
8.0
Very good
4,278 reviews

Comfort

8.0

Entertainment

7.6

Overall

8.0

Boarding

8.2

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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.

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

    Currently priced at $213, 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 JetBlue for as low as $362. Frontier is currently priced 50% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Islip, New York to San Juan one-way?

    $84 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on JetBlue and Southwest, with prices starting from $186 and $318, respectively.

  • 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, September is the cheapest month in which you can book a flight from Islip, New York to San Juan (average of $254). Flying from Islip, New York 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 June 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$218FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$231Average$390FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$477Average$585FlexibilityNo cancel feeOn-time63%

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