AirHint found the following cheapest return flights from Bilbao (BIO) to Sofia (SOF) in September 2026 (see full year).
Return flights
| 11 Sep - 15 Sep | Wizz Air Malta | ||
| 28 Sep - 04 Oct | Wizz Air UK | ||
| 04 Sep - 11 Sep | Vueling Airlines | ||
| 06 Sep - 20 Sep | Wizz Air Malta |
Also check the deals for one-way flights from Bilbao to Sofia in September.
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