Cheapest return flights from Philadelphia to San Juan in September from $303

Best time to book flights for Philadelphia (PHL) to San Juan (SJU) flights at AirHint

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

Return flights

01 Sep - 25 Sep American Airlines
14 Sep - 19 Sep Delta
27 Sep - 04 Oct American Airlines
09 Sep - 13 Sep American Airlines
25 Sep - 29 Sep United
24 Sep - 28 Sep United
17 Sep - 21 Sep United
01 Sep - 22 Sep United
03 Sep - 22 Sep Delta
05 Sep - 09 Sep jetBlue
27 Sep - 05 Oct jetBlue
04 Sep - 07 Sep jetBlue

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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