The calculated distance (air line) between Retiro and Torrejón de Ardoz is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Torrejón de Ardoz is certainly longer, as only the direct route (as the crow flies) between Retiro and Torrejón de Ardoz has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles