The calculated distance (air line) between Arrasate / Mondragón and Azkoitia is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Azkoitia is certainly longer, as only the direct route (as the crow flies) between Arrasate / Mondragón and Azkoitia has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles