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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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Jan 16 — Jan 231
Fri 1/16
Fri 1/23
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 December 17, 2025.

This CheapOair deal was found by Cheapflights users on 12/17. 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 12/315:27 pmISP - SJU
1 stop14h 56mFrontier
Sat 2/285:25 pmSJU - ISP
1 stop15h 23mFrontier
Deal found 12/17$238
This CheapOair deal was found by Cheapflights users on 12/14. 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 12/298:35 pmISP - SJU
1 stop11h 48mFrontier
Mon 1/123:58 amSJU - ISP
1 stop19h 48mFrontier
Deal found 12/14$253
This CheapOair deal was found by Cheapflights users on 12/15. 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 12/298:35 pmISP - SJU
1 stop22h 52mFrontier
Wed 1/79:23 pmSJU - ISP
1 stop23h 22mFrontier
Deal found 12/15$255
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/314:40 pmISP - SJU
1 stop28h 25mMultiple Airlines
Fri 1/98:05 pmSJU - ISP
1 stop24h 03mMultiple Airlines
Deal found 12/16$260
This CheapOair deal was found by Cheapflights users on 12/15. 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 12/1712:37 pmISP - SJU
1 stop19h 21mFrontier
Tue 12/239:37 pmSJU - ISP
1 stop20h 00mFrontier
Deal found 12/15$264
This CheapOair deal was found by Cheapflights users on 12/15. 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 12/1712:37 pmISP - SJU
1 stop19h 21mFrontier
Mon 12/226:00 amSJU - ISP
1 stop8h 09mFrontier
Deal found 12/15$265
This Frontier deal was found by Cheapflights users on 12/15. 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 12/191:27 pmISP - SJU
1 stop12h 23mFrontier
Wed 12/246:00 amSJU - ISP
1 stop11h 37mFrontier
Deal found 12/15$284
This CheapOair deal was found by Cheapflights users on 12/16. 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 12/191:27 pmISP - SJU
1 stop12h 23mFrontier
Wed 12/243:55 amSJU - ISP
1 stop8h 30mFrontier
Deal found 12/16$285
This CheapOair deal was found by Cheapflights users on 12/16. 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 12/315:27 pmISP - SJU
1 stop8h 23mFrontier
Wed 1/79:23 pmSJU - ISP
1 stop23h 22mFrontier
Deal found 12/16$289
This CheapOair deal was found by Cheapflights users on 12/16. 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 12/298:35 pmISP - SJU
1 stop29h 15mFrontier
Wed 12/319:37 pmSJU - ISP
1 stop14h 48mFrontier
Deal found 12/16$291
This CheapOair deal was found by Cheapflights users on 12/15. 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 12/236:25 amISP - SJU
1 stop15h 12mFrontier
Thu 1/228:00 amSJU - ISP
1 stop11h 48mFrontier
Deal found 12/15$303

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 December 17, 2025.

Round-trip from

$177
(CheapOair)

One-way from

$87
(CheapOair)

Popular in

October

Cheapest in

February

Average price

$673
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. 21% potential increase in price ($121 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($44 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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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 December 17, 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 2/21

8:23 pm-12:54 am

1 stop27h 31m

San Juan Luis Munoz Marin Intl

Thu 2/26

5:25 pm-2:39 pm

1 stop22h 14m

$177

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 3/5

3:34 pm-9:54 am

1 stop17h 20m

San Juan Luis Munoz Marin Intl

Wed 3/11

3:19 pm-4:13 pm

1 stop24h 54m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 1/5

8:24 pm-2:50 am

1 stop29h 26m

San Juan Luis Munoz Marin Intl

Fri 1/9

3:55 am-7:08 pm

1 stop16h 13m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 1/22

7:43 pm-10:24 am

1 stop13h 41m

San Juan Luis Munoz Marin Intl

Thu 1/29

4:36 pm-8:47 pm

1 stop29h 11m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 1/5

8:24 pm-2:50 am

1 stop29h 26m

San Juan Luis Munoz Marin Intl

Mon 1/12

9:23 pm-10:46 pm

1 stop26h 23m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 1/8

8:40 pm-11:20 am

1 stop13h 40m

San Juan Luis Munoz Marin Intl

Mon 1/12

9:23 pm-10:46 pm

1 stop26h 23m

$181

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 1/17

8:00 am-4:27 pm

1 stop7h 27m

San Juan Luis Munoz Marin Intl

Sat 1/24

4:36 pm-8:40 am

1 stop17h 04m

$200

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 2/23

8:23 am-12:57 pm

1 stop27h 34m

San Juan Luis Munoz Marin Intl

Sun 3/1

3:53 am-2:39 pm

1 stop11h 46m

$202

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 2/6

9:43 pm-11:59 pm

1 stop25h 16m

San Juan Luis Munoz Marin Intl

Tue 2/10

5:25 pm-1:13 pm

1 stop20h 48m

$212

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 2/25

2:03 pm-2:53 am

1 stop11h 50m

San Juan Luis Munoz Marin Intl

Sun 3/1

5:30 pm-2:39 pm

1 stop22h 09m

$212

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 18 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.

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 December 17, 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 46% 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 December 17, 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
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.5

Comfort

8.0

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
7.9
Good
4,250 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.5

Comfort

8.0

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
JetBlue
7.2
Good
2,896 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.5

Comfort

8.0

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
5.8
Fair
3,081 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.5

Comfort

8.0

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. 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 27h 31m. 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. 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 87% 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 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 December 17, 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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