AirHint found the following cheapest return flights from Philadelphia (PHL) to San Jose (SJO) in August 2025 (see full year).

Return flights

20 Aug - 24 Aug	Spirit Airlines
08 Aug - 11 Aug	Spirit Airlines
02 Aug - 10 Aug	Spirit Airlines
20 Aug - 25 Aug	Spirit Airlines
17 Aug - 24 Aug	Spirit Airlines
12 Aug - 19 Aug	Spirit Airlines
05 Aug - 08 Aug	Spirit Airlines
05 Aug - 11 Aug	Spirit Airlines
05 Aug - 10 Aug	Spirit Airlines
05 Aug - 24 Aug	Spirit Airlines

Also check the deals for one-way flights from Philadelphia to San Jose 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 return flights from Philadelphia to San Jose in August from $325

Return flights