The calculated distance (air line) between Arrasate / Mondragón and Oviedo is approximately 170 miles respectively 274 kilometers.
By car or train, the actual journey to Oviedo is certainly longer, as only the direct route (as the crow flies) between Arrasate / Mondragón and Oviedo has been calculated here.
Air line (approximately)
274 kilometers
148 nautical miles