The calculated distance (air line) between Medina de Ríoseco and Pamplona is approximately 185 miles respectively 298 kilometers.
By car or train, the actual journey to Pamplona is certainly longer, as only the direct route (as the crow flies) between Medina de Ríoseco and Pamplona has been calculated here.
Air line (approximately)
298 kilometers
161 nautical miles