AirHint found the following cheapest return flights from Oakland (OAK) to San Juan (SJU) in August 2025 (see full year).

Return flights

09 Aug - 15 Aug	Spirit Airlines
14 Aug - 22 Aug	Spirit Airlines
10 Aug - 15 Aug	Spirit Airlines
07 Aug - 12 Aug	Spirit Airlines
15 Aug - 22 Aug	Spirit Airlines
16 Aug - 23 Aug	Spirit Airlines
21 Aug - 28 Aug	Spirit Airlines
21 Aug - 24 Aug	Spirit Airlines
06 Aug - 08 Aug	Spirit Airlines
20 Aug - 26 Aug	Spirit Airlines
28 Aug - 05 Sep	Spirit Airlines
31 Aug - 05 Sep	Spirit Airlines

Also check the deals for one-way flights from Oakland 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 return flights from Oakland to San Juan in August from $329

Return flights