The calculated distance (air line) between Medina de Ríoseco and Gijón is approximately 118 miles respectively 191 kilometers.
By car or train, the actual journey to Gijón is certainly longer, as only the direct route (as the crow flies) between Medina de Ríoseco and Gijón has been calculated here.
Air line (approximately)
191 kilometers
103 nautical miles