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

Return flights

30 Aug - 07 Sep	Vueling Airlines
25 Aug - 08 Sep	Iberia
11 Aug - 05 Sep	Vueling Airlines
02 Aug - 14 Aug	Vueling Airlines
09 Aug - 29 Aug	Avianca
02 Aug - 15 Aug	Vueling Airlines
02 Aug - 16 Aug	Vueling Airlines
02 Aug - 23 Aug	Vueling Airlines
03 Aug - 15 Aug	Aer Lingus

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 $910

Return flights