Cheapest return flights from Philadelphia to San Juan in September from $163

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

Return flights

07 Sep - 18 Sep Spirit Airlines
06 Sep - 18 Sep Spirit Airlines
06 Sep - 26 Sep Spirit Airlines
30 Sep - 02 Oct Spirit Airlines
30 Sep - 04 Oct Spirit Airlines
25 Sep - 28 Sep Frontier Airlines direct
28 Sep - 08 Oct Frontier Airlines direct
14 Sep - 30 Sep Spirit Airlines
14 Sep - 01 Oct Spirit Airlines
16 Sep - 18 Sep Spirit Airlines
24 Sep - 28 Sep Spirit Airlines
06 Sep - 13 Sep Spirit Airlines
17 Sep - 18 Sep Spirit Airlines
14 Sep - 24 Sep Spirit Airlines
14 Sep - 02 Oct Spirit Airlines direct
30 Sep - 02 Oct Frontier Airlines direct
27 Sep - 02 Oct Frontier Airlines direct
27 Sep - 06 Oct Frontier Airlines direct
29 Sep - 08 Oct Frontier Airlines
26 Sep - 03 Oct Frontier Airlines direct

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.

Book a cheap hotel in San Juan

Cheap car rent in San Juan

Feel free to contact us with any feedback or request another flight research.