The nearest airport with international connections is Bilbao, which is about 1 hour away by public transport. 

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To reach Vitoria-Gasteiz from the Bilbao airport, catch the bus from the one and only bus stop just outside the arrivals area. Remain on the bus until the final stop at the Bilbao bus terminal (Termibus). Buses run every 15-20 minutes and the journey takes about 20-25 minutes. At the Bilbao bus terminal, take the bus to Vitoria-Gasteiz run by La Union bus line.