To get the best value, try booking a flight at midday when visiting Bilbao. Generally the prices will increase for flights in the evening as these tend to have higher demand.
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.
Bilbao (BIO), located 4.9 km from the city centre, is the airport you fly into when you book flights to Bilbao.
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