Cheapest return flights from Islip to San Juan in November from $253

AirHint found the following cheapest return flights from Islip (ISP) to San Juan (SJU) in November 2025 (see full year).

Return flights

12 Nov - 15 Nov Frontier Airlines
13 Nov - 15 Nov Frontier Airlines
10 Nov - 14 Nov Frontier Airlines
11 Nov - 15 Nov Frontier Airlines
01 Nov - 08 Nov Frontier Airlines
01 Nov - 04 Nov Frontier Airlines
03 Nov - 07 Nov Frontier Airlines
05 Nov - 09 Nov Frontier Airlines
08 Nov - 11 Nov Frontier Airlines
01 Nov - 11 Nov Frontier Airlines
27 Nov - 01 Dec Frontier Airlines
28 Nov - 01 Dec Southwest Airlines
26 Nov - 02 Dec Frontier Airlines
25 Nov - 01 Dec Frontier Airlines

Also check the deals for one-way flights from Islip to San Juan in November.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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