BIO stands for Bilbao Airport. Codes like this one are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.
Travellers will need to book flights to Bilbao (BIO) if they wish to fly to Bilbao. The Bilbao airport is 4.9 km from the city centre.
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