$182+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJU
Aug 17 — Aug 241
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Cheapest
Best
Last-minute
One-way
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 July 18, 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 July 18, 2026.
This Frontier deal was found by Cheapflights users on 7/17. 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 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
Tue 9/88:57 pm
SJU
- ISP
1 stop12h 36m
Frontier
Deal found 7/17![Frontier logo]()
$336
This Southwest deal was found by Cheapflights users on 7/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:25 pm
ISP
- SJU
1 stop11h 40m
Southwest
Wed 11/186:15 am
SJU
- ISP
2 stops11h 05m
Southwest
Deal found 7/14![Southwest logo]()
$342
This Kiwi.com deal was found by Cheapflights users on 7/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:28 pm
ISP
- SJU
2 stops34h 28m
Multiple Airlines
Tue 8/258:57 pm
SJU
- ISP
1 stop12h 56m
Multiple Airlines
Deal found 7/15![Multiple Airlines logo]()
$346
This Frontier deal was found by Cheapflights users on 7/15. 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.
Thu 8/207:09 pm
ISP
- SJU
1 stop7h 06m
Frontier
Wed 8/268:57 pm
SJU
- ISP
1 stop12h 56m
Frontier
Deal found 7/15![Frontier logo]()
$350
This Southwest deal was found by Cheapflights users on 7/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/153:10 pm
ISP
- SJU
2 stops9h 10m
Southwest
Tue 10/205:50 am
SJU
- ISP
1 stop6h 20m
Southwest
Deal found 7/16![Southwest logo]()
$353
This Priceline deal was found by Cheapflights users on 7/14. 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 Priceline 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
Multiple Airlines
Wed 11/119:00 am
SJU
- ISP
1 stop13h 37m
Multiple Airlines
Deal found 7/14![Multiple Airlines logo]()
$354
This Frontier deal was found by Cheapflights users on 7/14. 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.
Wed 10/74:13 pm
ISP
- SJU
1 stop9h 37m
Frontier
Sun 10/112:58 am
SJU
- ISP
1 stop6h 35m
Frontier
Deal found 7/14![Frontier logo]()
$355
This Expedia deal was found by Cheapflights users on 7/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/217:09 pm
ISP
- SJU
1 stop7h 06m
Frontier
Tue 8/256:09 pm
SJU
- ISP
1 stop15h 44m
Frontier
Deal found 7/15![Frontier logo]()
$356
This Frontier deal was found by Cheapflights users on 7/15. 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.
Sat 8/297:09 pm
ISP
- SJU
1 stop13h 02m
Frontier
Sat 9/53:10 am
SJU
- ISP
1 stop6h 43m
Frontier
Deal found 7/15![Frontier logo]()
$370
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:46 pm
ISP
- SJU
1 stop28h 55m
Frontier
Fri 8/215:37 pm
SJU
- ISP
1 stop25h 24m
Frontier
Deal found 7/17![Frontier logo]()
$374
This Frontier deal was found by Cheapflights users on 7/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/810:43 am
ISP
- SJU
1 stop8h 59m
Frontier
Tue 8/113:10 am
SJU
- ISP
1 stop6h 43m
Frontier
Deal found 7/16![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 July 18, 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 July 18, 2026.
This Southwest deal was found by Cheapflights users on 7/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:25 pm
ISP
- SJU
1 stop11h 40m
Southwest
Wed 11/186:15 am
SJU
- ISP
2 stops11h 05m
Southwest
Deal found 7/14![Southwest logo]()
$342
This Kiwi.com deal was found by Cheapflights users on 7/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:28 pm
ISP
- SJU
2 stops34h 28m
Multiple Airlines
Tue 8/258:57 pm
SJU
- ISP
1 stop12h 56m
Multiple Airlines
Deal found 7/15![Multiple Airlines logo]()
$346
This Frontier deal was found by Cheapflights users on 7/18. 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.
Thu 8/207:09 pm
ISP
- SJU
1 stop13h 02m
Frontier
Tue 8/258:57 pm
SJU
- ISP
1 stop12h 56m
Frontier
Deal found 7/18![Frontier logo]()
$350
This JetBlue deal was found by Cheapflights users on 7/14. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:00 am
ISP
- SJU
1 stop7h 06m
JetBlue
Tue 11/172:59 pm
SJU
- ISP
1 stop7h 38m
JetBlue
Deal found 7/14![JetBlue logo]()
$453
This Frontier deal was found by Cheapflights users on 7/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/3110:57 am
ISP
- SJU
1 stop8h 55m
Frontier
Wed 9/28:57 pm
SJU
- ISP
1 stop12h 56m
Frontier
Deal found 7/17![Frontier logo]()
$350
This Southwest deal was found by Cheapflights users on 7/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/153:10 pm
ISP
- SJU
2 stops9h 10m
Southwest
Tue 10/206:35 am
SJU
- ISP
2 stops9h 10m
Southwest
Deal found 7/16![Southwest logo]()
$353
This FlightHub deal was found by Cheapflights users on 7/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:00 am
ISP
- SJU
2 stops12h 02m
Multiple Airlines
Tue 8/258:57 pm
SJU
- ISP
1 stop12h 56m
Multiple Airlines
Deal found 7/18![Multiple Airlines logo]()
$396
This Southwest deal was found by Cheapflights users on 7/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:25 pm
ISP
- SJU
2 stops11h 20m
Southwest
Wed 11/116:15 am
SJU
- ISP
2 stops11h 05m
Southwest
Deal found 7/14![Southwest logo]()
$364
This Southwest deal was found by Cheapflights users on 7/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/241:15 pm
ISP
- SJU
2 stops8h 55m
Southwest
Mon 9/286:00 am
SJU
- ISP
2 stops10h 25m
Southwest
Deal found 7/18![Southwest logo]()
$388
This Southwest deal was found by Cheapflights users on 7/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/712:45 pm
ISP
- SJU
1 stop9h 10m
Southwest
Sun 11/157:30 am
SJU
- ISP
2 stops9h 05m
Southwest
Deal found 7/17![Southwest logo]()
$403
This Southwest deal was found by Cheapflights users on 7/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/85:35 am
ISP
- SJU
2 stops10h 25m
Southwest
Sun 11/155:35 am
SJU
- ISP
2 stops11h 00m
Southwest
Deal found 7/17![Southwest logo]()
$403
Last-minute flights from Islip to San JuanDiscover last-minute flight deals from Islip to San Juan. Data last updated July 18, 2026 and is based on user searches.
Discover last-minute flight deals from Islip to San Juan. Data last updated July 18, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 7/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/510:57 am
ISP
- SJU
1 stop8h 45m
Frontier
Tue 8/118:37 pm
SJU
- ISP
1 stop13h 16m
Frontier
Deal found 7/16![Frontier logo]()
$406
This Frontier deal was found by Cheapflights users on 7/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/810:43 am
ISP
- SJU
1 stop8h 59m
Frontier
Tue 8/118:37 pm
SJU
- ISP
1 stop13h 16m
Frontier
Deal found 7/16![Frontier logo]()
$376
This Frontier deal was found by Cheapflights users on 7/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/810:43 am
ISP
- SJU
1 stop8h 59m
Frontier
Thu 8/1310:48 pm
SJU
- ISP
1 stop11h 05m
Frontier
Deal found 7/16![Frontier logo]()
$390
This Frontier deal was found by Cheapflights users on 7/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/810:43 am
ISP
- SJU
1 stop8h 59m
Frontier
Thu 8/133:10 am
SJU
- ISP
1 stop6h 43m
Frontier
Deal found 7/16![Frontier logo]()
$396
This Priceline deal was found by Cheapflights users on 7/17. 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.
Tue 8/116:00 am
ISP
- SJU
2 stops17h 58m
Multiple Airlines
Fri 8/143:10 am
SJU
- ISP
1 stop6h 43m
Multiple Airlines
Deal found 7/17![Multiple Airlines logo]()
$402
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:46 pm
ISP
- SJU
1 stop28h 55m
Frontier
Fri 8/215:37 pm
SJU
- ISP
1 stop25h 24m
Frontier
Deal found 7/17![Frontier logo]()
$374
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:57 am
ISP
- SJU
2 stops12h 44m
Multiple Airlines
Fri 8/215:37 pm
SJU
- ISP
1 stop25h 24m
Multiple Airlines
Deal found 7/17![Multiple Airlines logo]()
$398
This Frontier deal was found by Cheapflights users on 7/15. 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.
Thu 8/207:09 pm
ISP
- SJU
1 stop7h 06m
Frontier
Wed 8/268:57 pm
SJU
- ISP
1 stop12h 56m
Frontier
Deal found 7/15![Frontier logo]()
$350
This Kiwi.com deal was found by Cheapflights users on 7/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/212:28 pm
ISP
- SJU
2 stops34h 28m
Multiple Airlines
Tue 8/258:57 pm
SJU
- ISP
1 stop12h 56m
Multiple Airlines
Deal found 7/15![Multiple Airlines logo]()
$346
This Expedia deal was found by Cheapflights users on 7/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/217:09 pm
ISP
- SJU
1 stop7h 06m
Frontier
Tue 8/256:09 pm
SJU
- ISP
1 stop15h 44m
Frontier
Deal found 7/15![Frontier logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 7/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/255:27 pm
ISP
- SJU
2 stops17h 39m
Multiple Airlines
Mon 8/318:57 pm
SJU
- ISP
1 stop12h 56m
Multiple Airlines
Deal found 7/17![Multiple Airlines logo]()
$379
This Frontier deal was found by Cheapflights users on 7/15. 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.
Sat 8/297:09 pm
ISP
- SJU
1 stop13h 02m
Frontier
Sat 9/53:10 am
SJU
- ISP
1 stop6h 43m
Frontier
Deal found 7/15![Frontier logo]()
$370
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 July 18, 2026.
Search for one-way flight options from Islip to San Juan. Find affordable one-way fares based on user searches. Data last updated July 18, 2026.
This Frontier deal was found by Cheapflights users on 7/14. 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 8/207:09 pm
ISP
- SJU
1 stop13h 02m
Frontier
Deal found 7/14![Frontier logo]()
$182
This Frontier deal was found by Cheapflights users on 7/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/184:13 pm
ISP
- SJU
1 stop9h 40m
Frontier
Deal found 7/16![Frontier logo]()
$188
This Frontier deal was found by Cheapflights users on 7/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/204:13 pm
ISP
- SJU
1 stop9h 37m
Frontier
Deal found 7/17![Frontier logo]()
$208
This Frontier deal was found by Cheapflights users on 7/18. 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.
Thu 12/109:56 am
ISP
- SJU
1 stop7h 36m
Frontier
Deal found 7/18![Frontier logo]()
$232
This Frontier deal was found by Cheapflights users on 7/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/810:43 am
ISP
- SJU
1 stop8h 59m
Frontier
Deal found 7/17![Frontier logo]()
$238
This Frontier deal was found by Cheapflights users on 7/15. 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.
Sun 12/139:56 am
ISP
- SJU
1 stop7h 36m
Frontier
Deal found 7/15![Frontier logo]()
$253
This JetBlue deal was found by Cheapflights users on 7/15. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/1512:00 pm
ISP
- SJU
1 stop9h 09m
JetBlue
Deal found 7/15![JetBlue logo]()
$258
This JetBlue deal was found by Cheapflights users on 7/17. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/74:50 pm
ISP
- SJU
1 stop9h 16m
JetBlue
Deal found 7/17![JetBlue logo]()
$274
This JetBlue deal was found by Cheapflights users on 7/17. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:00 am
ISP
- SJU
1 stop6h 48m
JetBlue
Deal found 7/17![JetBlue logo]()
$280
This JetBlue deal was found by Cheapflights users on 7/17. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/96:00 am
ISP
- SJU
1 stop6h 48m
JetBlue
Deal found 7/17![JetBlue logo]()
$285
This JetBlue deal was found by Cheapflights users on 7/17. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/56:00 am
ISP
- SJU
1 stop6h 48m
JetBlue
Deal found 7/17![JetBlue logo]()
$294
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 July 18, 2026.
Round-trip from | $336 (Frontier) |
|---|---|
One-way from | $182 (Frontier) |
Popular in | February |
Cheapest in | January |
Average price | $379 |
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 July 18, 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
Thu 11/12
12:25 pm-1:05 am
1 stop11h 40m
San Juan Luis Munoz Marin Intl
Wed 11/18
6:15 am-4:20 pm
2 stops11h 05m
$342
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Fri 8/21
2:28 pm-12:56 am
2 stops34h 28m
San Juan Luis Munoz Marin Intl
Tue 8/25
8:57 pm-9:53 am
1 stop12h 56m
$346
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Thu 8/20
7:09 pm-8:11 am
1 stop13h 02m
San Juan Luis Munoz Marin Intl
Tue 8/25
8:57 pm-9:53 am
1 stop12h 56m
$350
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Mon 8/31
10:57 am-7:52 pm
1 stop8h 55m
San Juan Luis Munoz Marin Intl
Wed 9/2
8:57 pm-9:53 am
1 stop12h 56m
$350
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Thu 10/15
3:10 pm-12:20 am
2 stops9h 10m
San Juan Luis Munoz Marin Intl
Tue 10/20
6:35 am-3:45 pm
2 stops9h 10m
$353
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Tue 11/3
12:25 pm-12:45 am
2 stops11h 20m
San Juan Luis Munoz Marin Intl
Wed 11/11
6:15 am-4:20 pm
2 stops11h 05m
$364
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Thu 9/24
1:15 pm-10:10 pm
2 stops8h 55m
San Juan Luis Munoz Marin Intl
Mon 9/28
6:00 am-4:25 pm
2 stops10h 25m
$388
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Thu 8/20
6:00 am-6:02 pm
2 stops12h 02m
San Juan Luis Munoz Marin Intl
Tue 8/25
8:57 pm-9:53 am
1 stop12h 56m
$396
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Sat 11/7
12:45 pm-10:55 pm
1 stop9h 10m
San Juan Luis Munoz Marin Intl
Sun 11/15
7:30 am-3:35 pm
2 stops9h 05m
$403
IslipSan Juan
ISP - SJU
ISPSJU
Islip Long Island
Sun 11/8
5:35 am-5:00 pm
2 stops10h 25m
San Juan Luis Munoz Marin Intl
Sun 11/15
5:35 am-3:35 pm
2 stops11h 00m
$403
Showing 1-10 of 19 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
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 July 18, 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
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Islip
Popular flights
Alternative routes for Islip to San Juan
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Juan by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Islip to San Juan by cabin class
Find flights from Islip to San Juan, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Islip and San Juan flights
Browse other Islip and San Juan flight options. Last updated on July 18, 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 July 18, 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 July 18, 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% |