The calculated distance (air line) between Retiro and Pinar de Chamartín is approximately 5 miles respectively 7 kilometers.
By car or train, the actual journey to Pinar de Chamartín is certainly longer, as only the direct route (as the crow flies) between Retiro and Pinar de Chamartín has been calculated here.
Air line (approximately)
7 kilometers
4 nautical miles