Cheapest return flights from Philadelphia to San Juan in September from $192

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

Return flights

23 Sep - 30 Sep Frontier Airlines
02 Sep - 09 Sep Frontier Airlines
03 Sep - 10 Sep Frontier Airlines
09 Sep - 16 Sep Frontier Airlines
16 Sep - 23 Sep Frontier Airlines
25 Sep - 29 Sep Spirit Airlines direct
21 Sep - 25 Sep Spirit Airlines direct
07 Sep - 11 Sep Spirit Airlines direct
17 Sep - 24 Sep Frontier Airlines
30 Sep - 07 Oct Frontier Airlines
25 Sep - 28 Sep Spirit Airlines direct
24 Sep - 01 Oct Frontier Airlines
24 Sep - 01 Oct Frontier Airlines direct
25 Sep - 09 Oct Spirit Airlines direct
21 Sep - 09 Oct Spirit Airlines direct
18 Sep - 09 Oct Spirit Airlines direct
25 Sep - 01 Oct Spirit Airlines
21 Sep - 01 Oct Spirit Airlines
18 Sep - 01 Oct Spirit Airlines
25 Sep - 03 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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