The calculated distance (air line) between Guadarrama and Puente de Vallecas is approximately 30 miles respectively 48 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 Guadarrama and Puente de Vallecas has been calculated here.
Air line (approximately)
48 kilometers
26 nautical miles