The calculated distance (air line) between Cercedilla and Puente de Vallecas is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to Puente de Vallecas is certainly longer, as only the direct route (as the crow flies) between Cercedilla and Puente de Vallecas has been calculated here.
Air line (approximately)
51 kilometers
28 nautical miles