Cheapest return flights from Islip to San Juan in June from $320

Best time to book flights for Islip (ISP) to San Juan (SJU) flights at AirHint

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

Return flights

06 Jun - 09 Jun Frontier Airlines
05 Jun - 14 Jun Frontier Airlines
08 Jun - 13 Jun Frontier Airlines
09 Jun - 16 Jun Frontier Airlines
13 Jun - 15 Jun Frontier Airlines
14 Jun - 16 Jun Frontier Airlines
14 Jun - 19 Jun Frontier Airlines
21 Jun - 24 Jun Frontier Airlines
21 Jun - 28 Jun Frontier Airlines
13 Jun - 16 Jun Frontier Airlines
25 Jun - 03 Jul Frontier Airlines
25 Jun - 13 Jul Frontier Airlines
25 Jun - 01 Jul Frontier Airlines
27 Jun - 01 Jul Frontier Airlines
25 Jun - 02 Jul Frontier Airlines
29 Jun - 06 Jul Frontier Airlines
26 Jun - 01 Jul Frontier Airlines

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

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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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