AirHint found the following cheapest return flights from Bilbao (BIO) to Sofia (SOF) in October 2025 (see full year).

Return flights

08 Oct - 14 Oct	Vueling Airlines
10 Oct - 15 Oct	Vueling Airlines
16 Oct - 19 Oct	Vueling Airlines
16 Oct - 23 Oct	Vueling Airlines
06 Oct - 15 Oct	Vueling Airlines
09 Oct - 12 Oct	Vueling Airlines
13 Oct - 20 Oct	Vueling Airlines
02 Oct - 05 Oct	Vueling Airlines
08 Oct - 17 Oct	Vueling Airlines
07 Oct - 09 Oct	Vueling Airlines

Also check the deals for one-way flights from Bilbao to Sofia in October.

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 Sofia in October from $94

Return flights