The calculated distance (air line) between Gernika-Lumo and Arrasate / Mondragón is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Arrasate / Mondragón is certainly longer, as only the direct route (as the crow flies) between Gernika-Lumo and Arrasate / Mondragón has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles