AirHint found the following cheapest return flights from Bilbao (BIO) to San Jose (SJO) in September 2026 (see full year).
Return flights
| 16 Sep - 26 Sep | Iberia | ||
| 05 Sep - 19 Sep | Air Europa | ||
| 06 Sep - 04 Oct | Iberia | ||
| 07 Sep - 21 Sep | Air Europa | ||
| 04 Sep - 02 Oct | Iberia | ||
| 30 Sep - 11 Oct | Iberia |
Also check the deals for one-way flights from Bilbao to San Jose in September.
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