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

One-Way flights

24 Aug	Spirit Airlines
17 Aug	Spirit Airlines
11 Aug	Spirit Airlines
24 Aug	Spirit Airlines	direct
09 Aug	Spirit Airlines	direct
06 Aug	Spirit Airlines	direct
04 Aug	Spirit Airlines	direct
02 Aug	Spirit Airlines	direct
19 Aug	Spirit Airlines	direct
25 Aug	Spirit Airlines	direct

Also check the deals for return flights from Philadelphia to San Juan in August.

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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Cheapest one-way flights from Philadelphia to San Juan in August from 79€

One-Way flights