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

Return flights

28 Aug - 06 Sep	Avianca
13 Aug - 19 Aug	Air Europa
08 Aug - 24 Aug	Avianca
05 Aug - 21 Aug	Avianca
06 Aug - 21 Aug	Avianca
07 Aug - 21 Aug	Avianca
11 Aug - 31 Aug	Avianca
25 Aug - 25 Aug	Air France
02 Aug - 21 Aug	Vueling Airlines
01 Aug - 21 Aug	Vueling Airlines
03 Aug - 21 Aug	Vueling Airlines

Also check the deals for one-way flights from Bilbao 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 Bilbao to San Jose in August from 779€

Return flights