The calculated distance (air line) between El Escorial and Puente de Vallecas is approximately 28 miles respectively 45 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 El Escorial and Puente de Vallecas has been calculated here.
Air line (approximately)
45 kilometers
24 nautical miles