Cheapest return flights from Philadelphia to San Juan in September from 166€

AirHint found the following cheapest return flights from Philadelphia (PHL) to San Juan (SJU) in September 2025 (see full year).

Return flights

25 Sep - 28 Sep Frontier Airlines direct
18 Sep - 21 Sep Frontier Airlines direct
25 Sep - 29 Sep Frontier Airlines direct
13 Sep - 20 Sep Spirit Airlines
06 Sep - 11 Sep Frontier Airlines
06 Sep - 13 Sep Frontier Airlines
19 Sep - 21 Sep Frontier Airlines direct
24 Sep - 28 Sep Frontier Airlines direct
13 Sep - 20 Sep Frontier Airlines direct
27 Sep - 04 Oct Frontier Airlines direct
01 Sep - 05 Sep Frontier Airlines direct
21 Sep - 09 Oct Spirit Airlines direct
25 Sep - 09 Oct Spirit Airlines direct
22 Sep - 09 Oct Spirit Airlines
20 Sep - 09 Oct Spirit Airlines
25 Sep - 12 Oct Spirit Airlines direct
21 Sep - 08 Oct Spirit Airlines
21 Sep - 03 Oct Spirit Airlines
27 Sep - 09 Oct Spirit Airlines
19 Sep - 09 Oct Spirit Airlines

Also check the deals for one-way flights from Philadelphia to San Juan in September.

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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