Cheapest one-way flights from Philadelphia to San Juan in September from 78€

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

One-Way flights

21 Sep Frontier Airlines
14 Sep Frontier Airlines
07 Sep Frontier Airlines
13 Sep Spirit Airlines
14 Sep Frontier Airlines direct
07 Sep Frontier Airlines direct
21 Sep Spirit Airlines direct
18 Sep Spirit Airlines direct
12 Sep Frontier Airlines
16 Sep Spirit 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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