The calculated distance (air line) between Córdoba and Fernán-Núñez is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Fernán-Núñez is certainly longer, as only the direct route (as the crow flies) between Córdoba and Fernán-Núñez has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles