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

Return flights

30 Aug - 10 Sep	Avianca
28 Aug - 04 Sep	Avianca
29 Aug - 05 Sep	Avianca
18 Aug - 22 Aug	Copa
21 Aug - 25 Aug	Copa
20 Aug - 27 Aug	Avianca
11 Aug - 18 Aug	Avianca
13 Aug - 20 Aug	Avianca
21 Aug - 28 Aug	Avianca
28 Aug - 15 Sep	Avianca
29 Aug - 05 Sep	Avianca	direct
08 Aug - 17 Aug	Avianca
08 Aug - 15 Aug	Avianca
05 Aug - 12 Aug	Avianca
04 Aug - 08 Aug	Avianca
26 Aug - 04 Sep	Spirit Airlines
26 Aug - 15 Sep	Spirit Airlines
31 Aug - 04 Sep	Spirit Airlines
31 Aug - 15 Sep	Spirit Airlines
21 Aug - 04 Sep	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 $209

Return flights