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

Return flights

25 Aug - 30 Aug	United
18 Aug - 25 Aug	Delta
06 Aug - 12 Aug	Spirit Airlines
07 Aug - 09 Aug	Spirit Airlines
07 Aug - 10 Aug	Frontier Airlines
03 Aug - 09 Aug	Spirit Airlines
03 Aug - 07 Aug	Spirit Airlines
08 Aug - 10 Aug	Spirit Airlines
08 Aug - 09 Aug	Spirit Airlines
03 Aug - 10 Aug	Spirit Airlines

Also check the deals for one-way flights from San Jose 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 San Jose to San Juan in August from $367

Return flights