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$139+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Apr 7 — Apr 141
Mon 4/7
Mon 4/14
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 April 2, 2025.

Round-trip from

$287
(JetBlue)

One-way from

$139
(JetBlue)

Popular in

October

Cheapest in

November

Average price

$299
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. 0% potential increase in price ($1 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($30 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 2, 2025.

This JetBlue deal was found by Cheapflights users on 4/1. 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.
Sat 4/2610:39 amISP - SJU
1 stop9h 32mJetBlue
Tue 4/294:30 amSJU - ISP
1 stop6h 30mJetBlue
Deal found 4/1$287
This Frontier deal was found by Cheapflights users on 4/1. 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.
Fri 4/184:31 pmISP - SJU
1 stop8h 28mFrontier
Tue 4/229:30 pmSJU - ISP
1 stop12h 30mFrontier
Deal found 4/1$296
This Southwest deal was found by Cheapflights users on 4/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/204:00 pmISP - SJU
1 stop6h 30mSouthwest
Wed 8/275:00 amSJU - ISP
2 stops10h 10mSouthwest
Deal found 4/1$467
This Trip.com deal was found by Cheapflights users on 4/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/149:29 pmISP - SJU
1 stop11h 04mMultiple Airlines
Mon 4/219:30 pmSJU - ISP
2 stops20h 29mMultiple Airlines
Deal found 4/1$663

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 April 2, 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

Sat 4/26

10:39 am-8:11 pm

1 stop9h 32m

San Juan Luis Munoz Marin Intl

Tue 4/29

4:30 am-11:00 am

1 stop6h 30m

$287

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 4/18

4:31 pm-12:59 am

1 stop8h 28m

San Juan Luis Munoz Marin Intl

Tue 4/22

9:30 pm-10:00 am

1 stop12h 30m

$296

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 4/28

10:30 am-9:05 pm

2 stops10h 35m

San Juan Luis Munoz Marin Intl

Mon 5/5

10:45 am-8:20 pm

2 stops9h 35m

$513

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 4/14

9:29 pm-8:33 am

1 stop11h 04m

San Juan Luis Munoz Marin Intl

Mon 4/21

9:30 pm-5:59 pm

2 stops20h 29m

$663

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Tue 4/29

10:39 am-8:11 pm

1 stop9h 32m

$139

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 5/17

7:15 pm-2:51 am

1 stop7h 36m

$146

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 4/5

2:35 pm-4:34 pm

2 stops25h 59m

$385

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

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 December is currently the most expensive (average of $336). 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 April 2, 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.

Rainfall in San Juan by month

Plan your trip to San Juan by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Juan ranges from 2.2 - 6.1 inches per month. November is typically the wettest month, when rainfall can reach 6.1 in. February is typically the driest time to visit San Juan when rainfall is around 2.2 in.

Temperature in San Juan by month

Plan your trip to San Juan by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Juan, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 77.0 F).

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 April 2, 2025.
See what other customers who have flown with Southwest, JetBlue and Frontier from Islip to San Juan have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,272 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Boarding

8.2

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.0
Very good
4,272 reviews
Southwest
8.0
Very good
4,272 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Boarding

8.2

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
JetBlue
7.3
Good
2,922 reviews
Southwest
8.0
Very good
4,272 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Boarding

8.2

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Frontier
6.0
Okay
3,276 reviews
Southwest
8.0
Very good
4,272 reviews

Entertainment

7.6

Overall

8.0

Comfort

8.0

Boarding

8.2

Crew

8.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 $287, JetBlue will fly you from Islip, New York to San Juan and back. In addition to JetBlue, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Frontier and Southwest - these airlines can fly you to your destination from $296 and $467, respectively. JetBlue is currently priced 25% 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, 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 December is currently the most expensive (average of $336). 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 April 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$59Average$218FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$231Average$390FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$477Average$624FlexibilityNo cancel feeOn-time63%

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