The calculated distance (air line) between Arrasate / Mondragón and Gijón is approximately 163 miles respectively 262 kilometers.
By car or train, the actual journey to Gijón is certainly longer, as only the direct route (as the crow flies) between Arrasate / Mondragón and Gijón has been calculated here.
Air line (approximately)
262 kilometers
141 nautical miles