The calculated distance (air line) between Arrasate / Mondragón and Azpeitia is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Azpeitia is certainly longer, as only the direct route (as the crow flies) between Arrasate / Mondragón and Azpeitia has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles