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San Juan

$208+ 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 8/21. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Jul 19 — Jul 261
Sun 7/19
Sun 7/26
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 June 19, 2026.

This Frontier deal was found by Cheapflights users on 6/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/33:43 pm
ISP
-
SJU
1 stop10h 07m
Frontier
Wed 11/47:05 am
SJU
-
ISP
1 stop8h 28m
Frontier
Deal found 6/14$331
This Priceline deal was found by Cheapflights users on 6/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/224:13 pm
ISP
-
SJU
1 stop9h 37m
Frontier
Wed 9/306:42 pm
SJU
-
ISP
1 stop14h 51m
Frontier
Deal found 6/15$336
This Priceline deal was found by Cheapflights users on 6/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/57:46 pm
ISP
-
SJU
1 stop28h 55m
Frontier
Fri 8/143:10 am
SJU
-
ISP
1 stop6h 43m
Frontier
Deal found 6/15$350
This Frontier deal was found by Cheapflights users on 6/18. 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.
Tue 9/110:57 am
ISP
-
SJU
1 stop8h 55m
Frontier
Sat 9/58:57 pm
SJU
-
ISP
1 stop12h 56m
Frontier
Deal found 6/18$356
This Priceline deal was found by Cheapflights users on 6/17. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/184:13 pm
ISP
-
SJU
1 stop25h 23m
Frontier
Sat 9/264:39 pm
SJU
-
ISP
1 stop26h 12m
Frontier
Deal found 6/17$370
This Priceline deal was found by Cheapflights users on 6/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/207:46 pm
ISP
-
SJU
1 stop28h 55m
Frontier
Fri 7/2410:48 pm
SJU
-
ISP
1 stop11h 05m
Frontier
Deal found 6/16$375
This Frontier deal was found by Cheapflights users on 6/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/33:43 pm
ISP
-
SJU
1 stop10h 07m
Frontier
Wed 11/43:55 am
SJU
-
ISP
1 stop6h 38m
Frontier
Deal found 6/14$376
This Priceline deal was found by Cheapflights users on 6/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/128:55 pm
ISP
-
SJU
1 stop27h 02m
Frontier
Sun 10/182:58 am
SJU
-
ISP
1 stop6h 35m
Frontier
Deal found 6/16$390
This Frontier deal was found by Cheapflights users on 6/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/54:13 pm
ISP
-
SJU
1 stop9h 37m
Frontier
Fri 11/63:55 am
SJU
-
ISP
1 stop11h 38m
Frontier
Deal found 6/14$395
This Priceline deal was found by Cheapflights users on 6/17. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/410:48 am
ISP
-
SJU
1 stop23h 55m
Frontier
Thu 7/93:10 am
SJU
-
ISP
1 stop6h 43m
Frontier
Deal found 6/17$396
This Cheapflightsfares deal was found by Cheapflights users on 6/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:00 am
ISP
-
SJU
1 stop6h 45m
JetBlue
Tue 8/253:01 pm
SJU
-
ISP
1 stop7h 55m
JetBlue
Deal found 6/14$407

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 June 19, 2026.

Round-trip from

$331
(Frontier)

One-way from

$208
(Frontier)

Popular in

February

Cheapest in

January

Average price

$563
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. 5% potential increase in price ($32 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

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 19, 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

Tue 9/1

10:57 am-7:52 pm

1 stop8h 55m

San Juan Luis Munoz Marin Intl

Sat 9/5

8:57 pm-9:53 am

1 stop12h 56m

$356

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 8/12

6:00 am-3:21 pm

1 stop9h 21m

San Juan Luis Munoz Marin Intl

Thu 8/20

3:01 pm-10:56 pm

1 stop7h 55m

$422

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Sat 8/15

6:00 am-3:21 pm

1 stop9h 21m

San Juan Luis Munoz Marin Intl

Thu 8/20

3:01 pm-10:56 pm

1 stop7h 55m

$422
Quickest round-trip

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Thu 8/20

6:00 am-12:45 pm

1 stop6h 45m

San Juan Luis Munoz Marin Intl

Tue 8/25

3:01 pm-10:56 pm

1 stop7h 55m

$426

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Mon 10/12

5:55 pm-12:35 am

1 stop6h 40m

San Juan Luis Munoz Marin Intl

Mon 10/19

6:00 am-5:20 pm

2 stops11h 20m

$460

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Tue 9/22

10:55 am-9:05 pm

2 stops10h 10m

San Juan Luis Munoz Marin Intl

Wed 9/30

5:15 am-4:55 pm

2 stops11h 40m

$460

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 8/14

6:00 am-12:46 pm

1 stop6h 46m

San Juan Luis Munoz Marin Intl

Thu 8/20

3:01 pm-10:56 pm

1 stop7h 55m

$473

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Wed 7/29

10:57 am-7:42 pm

1 stop8h 45m

San Juan Luis Munoz Marin Intl

Sat 8/1

5:01 am-9:44 pm

1 stop16h 43m

$492

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Fri 8/7

1:15 pm-10:10 pm

2 stops8h 55m

San Juan Luis Munoz Marin Intl

Tue 8/11

5:15 am-4:55 pm

2 stops11h 40m

$508

IslipSan Juan

ISP - SJU

ISPSJU

Islip Long Island

Tue 6/30

4:41 pm-2:09 am

1 stop9h 28m

San Juan Luis Munoz Marin Intl

Fri 7/3

5:15 pm-11:17 am

2 stops18h 02m

$533

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/16

Showing 1-10 of 21 resultsSorted by cheapest first
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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
No data available for this route at this time. Please check back soon.

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 19, 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
7.9
Good
4,239 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
Southwest
7.9
Good
4,239 reviews
Southwest
7.9
Good
4,239 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.
Frontier
5.6
Fair
2,879 reviews
Southwest
7.9
Good
4,239 reviews

Boarding

8.1

Overall

7.9

Entertainment

7.5

Comfort

8.0

Food

7.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

La Tracimeldamarcos,Jun 2026

LAX - SLC

The second flight was not as comfortable as the first as we had to change planes to what seemed to be a slightly older aircraft. The seats weren’t as comfortable as the other plane. But it wasn’t bad.

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 6h 40m. 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 $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 80% 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.

See more FAQs

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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 June 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$106Average$356FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$367Average$556FlexibilityNo cancel feeOn-time63%

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