Cheapest one-way flights from Philadelphia to San Juan in September from $95

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

One-Way flights

11 Sep Frontier Airlines
23 Sep Frontier Airlines
16 Sep Frontier Airlines
17 Sep Frontier Airlines
20 Sep Frontier Airlines
02 Sep Frontier Airlines
14 Sep Spirit Airlines direct
07 Sep Spirit Airlines direct
05 Sep Frontier Airlines
19 Sep Frontier Airlines

Also check the deals for return 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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