The calculated distance (air line) between Gasteiz / Vitoria and Azkoitia is approximately 29 miles respectively 47 kilometers.
By car or train, the actual journey to Azkoitia is certainly longer, as only the direct route (as the crow flies) between Gasteiz / Vitoria and Azkoitia has been calculated here.
Air line (approximately)
47 kilometers
25 nautical miles