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

Return flights

19 Aug - 26 Aug	GOL Linhas Aéreas
19 Aug - 28 Aug	GOL Linhas Aéreas
07 Aug - 20 Aug	GOL Linhas Aéreas
15 Aug - 22 Aug	Avianca
25 Aug - 05 Sep	Avianca
31 Aug - 07 Sep	Avianca
09 Aug - 21 Sep	GOL Linhas Aéreas
21 Aug - 30 Aug	Avianca
21 Aug - 31 Aug	Avianca
25 Aug - 01 Sep	Avianca
18 Aug - 25 Aug	Avianca
23 Aug - 30 Aug	Avianca
11 Aug - 20 Aug	Avianca
30 Aug - 06 Sep	Avianca
22 Aug - 12 Sep	Avianca
23 Aug - 13 Sep	Avianca
09 Aug - 18 Aug	Avianca

Also check the deals for one-way flights from San Jose to Buenos Aires 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 Buenos Aires in August from 389€

Return flights