Cheapest return flights from Bilbao to Sofia in September from $181

Best time to book flights for Bilbao (BIO) to Sofia (SOF) flights at AirHint

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

Return flights

09 Sep - 15 Oct easyJet
17 Sep - 25 Sep Vueling Airlines
09 Sep - 17 Sep easyJet
03 Sep - 20 Sep Vueling Airlines
09 Sep - 13 Sep easyJet
08 Sep - 21 Sep Vueling Airlines
11 Sep - 15 Sep Vueling Airlines
08 Sep - 17 Sep Vueling Airlines
05 Sep - 08 Sep Air Europa

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

Skyscanner

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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