$148+ 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 8/26. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Jun 22 — Jun 291
Round-trip
1 adult, Economy
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Find cheap flights from Islip to San Juan with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Islip to San Juan
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Cheapest flights from Islip to San JuanExplore 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 May 23, 2026.
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 May 23, 2026.
This CheapOair deal was found by Cheapflights users on 5/19. 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 10/214:13 pm
ISP
- SJU
1 stop21h 03m
Frontier
Tue 10/272:55 am
SJU
- ISP
1 stop11h 38m
Frontier
Deal found 5/19![Frontier logo]()
$296
This Priceline deal was found by Cheapflights users on 5/18. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/511:00 am
ISP
- SJU
1 stop15h 08m
Frontier
Tue 6/96:00 am
SJU
- ISP
1 stop9h 56m
Frontier
Deal found 5/18![Frontier logo]()
$336
This CheapOair deal was found by Cheapflights users on 5/20. 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.
Sat 7/257:46 pm
ISP
- SJU
1 stop28h 55m
Frontier
Tue 7/288:37 pm
SJU
- ISP
1 stop13h 16m
Frontier
Deal found 5/20![Frontier logo]()
$350
This CheapOair deal was found by Cheapflights users on 5/23. 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 7/2910:57 am
ISP
- SJU
1 stop8h 45m
Frontier
Thu 8/69:02 am
SJU
- ISP
1 stop24h 51m
Frontier
Deal found 5/23![Frontier logo]()
$355
This CheapOair deal was found by Cheapflights users on 5/22. 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 7/37:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Tue 7/78:37 pm
SJU
- ISP
1 stop13h 16m
Frontier
Deal found 5/22![Frontier logo]()
$356
This CheapOair deal was found by Cheapflights users on 5/22. 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 9/244:13 pm
ISP
- SJU
1 stop25h 24m
Frontier
Sun 9/273:00 am
SJU
- ISP
1 stop6h 33m
Frontier
Deal found 5/22![Frontier logo]()
$364
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3011:00 am
ISP
- SJU
1 stop15h 08m
Frontier
Tue 6/96:00 am
SJU
- ISP
1 stop9h 56m
Frontier
Deal found 5/18![Frontier logo]()
$366
This Priceline deal was found by Cheapflights users on 5/23. 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 6/207:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Fri 6/263:06 am
SJU
- ISP
1 stop17h 51m
Frontier
Deal found 5/23![Frontier logo]()
$369
This CheapOair deal was found by Cheapflights users on 5/19. 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.
Sat 10/34:13 pm
ISP
- SJU
1 stop9h 37m
Frontier
Sat 10/109:49 pm
SJU
- ISP
1 stop11h 44m
Frontier
Deal found 5/19![Frontier logo]()
$370
This CheapOair deal was found by Cheapflights users on 5/19. 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 11/23:43 pm
ISP
- SJU
1 stop25h 53m
Frontier
Mon 11/97:42 pm
SJU
- ISP
1 stop19h 51m
Frontier
Deal found 5/19![Frontier logo]()
$374
This CheapOair deal was found by Cheapflights users on 5/20. 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 11/54:13 pm
ISP
- SJU
1 stop15h 45m
Frontier
Sun 11/86:31 pm
SJU
- ISP
1 stop21h 02m
Frontier
Deal found 5/20![Frontier logo]()
$375
This CheapOair deal was found by Cheapflights users on 5/20. 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.
Sat 6/611:00 am
ISP
- SJU
1 stop15h 08m
Frontier
Wed 6/106:00 am
SJU
- ISP
1 stop14h 57m
Frontier
Deal found 5/20![Frontier logo]()
$376
Best flights from Islip to San JuanDiscover carefully curated flight deals from Islip to San Juan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 23, 2026.
Discover carefully curated flight deals from Islip to San Juan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 23, 2026.
This Priceline deal was found by Cheapflights users on 5/23. 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
Tue 7/145:22 pm
SJU
- ISP
1 stop25h 39m
Frontier
Deal found 5/23![Frontier logo]()
$350
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/411:00 am
ISP
- SJU
1 stop15h 08m
Frontier
Tue 6/96:00 am
SJU
- ISP
1 stop9h 56m
Frontier
Deal found 5/18![Frontier logo]()
$366
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/710:48 am
ISP
- SJU
1 stop15h 23m
Frontier
Sun 8/236:16 pm
SJU
- ISP
1 stop15h 47m
Frontier
Deal found 5/18![Frontier logo]()
$376
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/257:50 pm
ISP
- SJU
1 stop28h 51m
Frontier
Sun 8/23:06 am
SJU
- ISP
1 stop6h 52m
Frontier
Deal found 5/18![Frontier logo]()
$379
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/37:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Tue 7/76:31 pm
SJU
- ISP
1 stop15h 27m
Frontier
Deal found 5/18![Frontier logo]()
$380
This CheapOair deal was found by Cheapflights users on 5/22. 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 6/511:00 am
ISP
- SJU
1 stop15h 08m
Frontier
Tue 6/95:15 pm
SJU
- ISP
1 stop25h 50m
Frontier
Deal found 5/22![Frontier logo]()
$396
This CheapOair deal was found by Cheapflights users on 5/21. 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 7/107:46 pm
ISP
- SJU
1 stop28h 55m
Frontier
Sun 7/128:37 pm
SJU
- ISP
1 stop13h 16m
Frontier
Deal found 5/21![Frontier logo]()
$396
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/610:48 am
ISP
- SJU
1 stop12h 41m
Frontier
Sun 8/165:22 pm
SJU
- ISP
1 stop25h 41m
Frontier
Deal found 5/18![Frontier logo]()
$420
This CheapOair deal was found by Cheapflights users on 5/19. 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 6/197:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Sun 6/216:16 pm
SJU
- ISP
1 stop26h 41m
Frontier
Deal found 5/19![Frontier logo]()
$425
This CheapOair deal was found by Cheapflights users on 5/19. 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 6/177:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Tue 6/235:15 pm
SJU
- ISP
1 stop25h 50m
Frontier
Deal found 5/19![Frontier logo]()
$440
This CheapOair deal was found by Cheapflights users on 5/23. 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 6/269:52 pm
ISP
- SJU
1 stop10h 03m
Frontier
Wed 7/16:05 pm
SJU
- ISP
1 stop15h 58m
Frontier
Deal found 5/23![Frontier logo]()
$441
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/2710:48 am
ISP
- SJU
1 stop6h 48m
Frontier
Wed 7/293:06 am
SJU
- ISP
1 stop6h 57m
Frontier
Deal found 5/18![Frontier logo]()
$446
Last-minute flights from Islip to San JuanDiscover last-minute flight deals from Islip to San Juan. Data last updated May 23, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Juan. Data last updated May 23, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3011:00 am
ISP
- SJU
1 stop15h 08m
Frontier
Tue 6/96:00 am
SJU
- ISP
1 stop9h 56m
Frontier
Deal found 5/18![Frontier logo]()
$366
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3011:00 am
ISP
- SJU
1 stop15h 08m
Frontier
Tue 6/24:46 pm
SJU
- ISP
1 stop25h 12m
Frontier
Deal found 5/18![Frontier logo]()
$386
This Priceline deal was found by Cheapflights users on 5/18. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/511:00 am
ISP
- SJU
1 stop15h 08m
Frontier
Tue 6/96:00 am
SJU
- ISP
1 stop9h 56m
Frontier
Deal found 5/18![Frontier logo]()
$336
This CheapOair deal was found by Cheapflights users on 5/20. 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.
Sat 6/611:00 am
ISP
- SJU
1 stop15h 08m
Frontier
Wed 6/106:00 am
SJU
- ISP
1 stop14h 57m
Frontier
Deal found 5/20![Frontier logo]()
$376
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/127:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Tue 6/165:15 pm
SJU
- ISP
1 stop25h 50m
Frontier
Deal found 5/18![Frontier logo]()
$356
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/127:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Mon 6/156:00 am
SJU
- ISP
1 stop14h 57m
Frontier
Deal found 5/18![Frontier logo]()
$385
This CheapOair deal was found by Cheapflights users on 5/23. 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 6/127:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Sun 6/214:05 pm
SJU
- ISP
1 stop28h 52m
Frontier
Deal found 5/23![Frontier logo]()
$396
This CheapOair deal was found by Cheapflights users on 5/23. 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.
Sat 6/139:52 pm
ISP
- SJU
1 stop15h 24m
Frontier
Mon 6/153:06 am
SJU
- ISP
1 stop12h 50m
Frontier
Deal found 5/23![Frontier logo]()
$350
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/197:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Wed 6/246:05 pm
SJU
- ISP
1 stop26h 52m
Frontier
Deal found 5/18![Frontier logo]()
$400
This Priceline deal was found by Cheapflights users on 5/23. 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 6/207:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Fri 6/263:06 am
SJU
- ISP
1 stop17h 51m
Frontier
Deal found 5/23![Frontier logo]()
$369
This CheapOair deal was found by Cheapflights users on 5/22. 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.
Sat 6/207:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Thu 6/255:15 pm
SJU
- ISP
1 stop25h 50m
Frontier
Deal found 5/22![Frontier logo]()
$395
This CheapOair deal was found by Cheapflights users on 5/23. 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.
Sat 6/277:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Sun 7/511:50 am
SJU
- ISP
1 stop22h 03m
Frontier
Deal found 5/23![Frontier logo]()
$390
One-way flights from Islip to San JuanSearch for one-way flight options from Islip to San Juan. Find affordable one-way fares based on user searches. Data last updated May 23, 2026.
Search for one-way flight options from Islip to San Juan. Find affordable one-way fares based on user searches. Data last updated May 23, 2026.
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2610:48 am
ISP
- SJU
1 stop15h 06m
Frontier
Deal found 5/18![Frontier logo]()
$148
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/23:43 pm
ISP
- SJU
1 stop10h 07m
Frontier
Deal found 5/18![Frontier logo]()
$167
This CheapOair deal was found by Cheapflights users on 5/19. 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.
Sat 6/137:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Deal found 5/19![Frontier logo]()
$168
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/207:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Deal found 5/18![Frontier logo]()
$173
This CheapOair deal was found by Cheapflights users on 5/20. 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 6/247:50 pm
ISP
- SJU
1 stop28h 47m
Frontier
Deal found 5/20![Frontier logo]()
$174
This CheapOair deal was found by Cheapflights users on 5/21. 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 8/3110:48 am
ISP
- SJU
1 stop12h 41m
Frontier
Deal found 5/21![Frontier logo]()
$182
This CheapOair deal was found by Cheapflights users on 5/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/199:52 pm
ISP
- SJU
1 stop10h 03m
Frontier
Deal found 5/18![Frontier logo]()
$188
This CheapOair deal was found by Cheapflights users on 5/23. 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 7/107:46 pm
ISP
- SJU
1 stop28h 55m
Frontier
Deal found 5/23![Frontier logo]()
$194
This CheapOair deal was found by Cheapflights users on 5/19. 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 10/194:13 pm
ISP
- SJU
1 stop9h 40m
Frontier
Deal found 5/19![Frontier logo]()
$204
This CheapOair deal was found by Cheapflights users on 5/22. 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.
Sun 6/711:00 am
ISP
- SJU
1 stop12h 22m
Frontier
Deal found 5/22![Frontier logo]()
$208
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 May 23, 2026.
Round-trip from | $296 (CheapOair) |
|---|---|
One-way from | $148 (CheapOair) |
Popular in | February |
Cheapest in | January |
Average price | $636 |
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 May 23, 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
Cheapest round-trip
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Sat 7/4
10:48 am-10:43 am
1 stop23h 55m
San Juan Luis Munoz Marin Intl
Tue 7/14
5:22 pm-7:01 pm
1 stop25h 39m
$350
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Thu 6/4
11:00 am-2:08 am
1 stop15h 08m
San Juan Luis Munoz Marin Intl
Tue 6/9
6:00 am-3:56 pm
1 stop9h 56m
$366
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Fri 8/7
10:48 am-2:11 am
1 stop15h 23m
San Juan Luis Munoz Marin Intl
Sun 8/23
6:16 pm-10:03 am
1 stop15h 47m
$376
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Sat 7/25
7:50 pm-12:41 am
1 stop28h 51m
San Juan Luis Munoz Marin Intl
Sun 8/2
3:06 am-9:58 am
1 stop6h 52m
$379
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Fri 7/3
7:50 pm-12:37 am
1 stop28h 47m
San Juan Luis Munoz Marin Intl
Tue 7/7
6:31 pm-9:58 am
1 stop15h 27m
$380
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Fri 6/5
11:00 am-2:08 am
1 stop15h 08m
San Juan Luis Munoz Marin Intl
Tue 6/9
5:15 pm-7:05 pm
1 stop25h 50m
$396
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Fri 7/10
7:46 pm-12:41 am
1 stop28h 55m
San Juan Luis Munoz Marin Intl
Sun 7/12
8:37 pm-9:53 am
1 stop13h 16m
$396
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Thu 8/6
10:48 am-11:29 pm
1 stop12h 41m
San Juan Luis Munoz Marin Intl
Sun 8/16
5:22 pm-7:03 pm
1 stop25h 41m
$420
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Fri 6/19
7:50 pm-12:37 am
1 stop28h 47m
San Juan Luis Munoz Marin Intl
Sun 6/21
6:16 pm-8:57 pm
1 stop26h 41m
$425
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Wed 6/17
7:50 pm-12:37 am
1 stop28h 47m
San Juan Luis Munoz Marin Intl
Tue 6/23
5:15 pm-7:05 pm
1 stop25h 50m
$440
Showing 1-10 of 23 resultsSorted by cheapest first
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.
ISP-PR1
ISP-SJU
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
ISP-PR1
ISP-SJU
What is the cheapest month to book a flight from Islip, New York to San Juan?
Currently, January is the cheapest month in which you can book a flight from Islip, New York to San Juan (average of $106). Flying from Islip, New York to San Juan in February is currently the most expensive (average of $865). 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.
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 May 23, 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.
Boarding
8.1
Entertainment
7.5
Overall
7.9
Food
7.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Overall
7.9
Food
7.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Entertainment
7.5
Overall
7.9
Food
7.0
Comfort
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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.
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Alternative routes for Islip to San Juan
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Complete your trip
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Islip and San Juan flights
Browse other Islip and San Juan flight options. Last updated on May 23, 2026.
Other flights from Islip
Browse through other flights departing from Islip. Flights are based on user searches made on Cheapflights and were last updated on May 23, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 May 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$106 | Average$356 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$367 | Average$556 | FlexibilityNo cancel fee | On-time63% |