The calculated distance (air line) between San Ildefonso and Puente de Vallecas is approximately 40 miles respectively 64 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 San Ildefonso and Puente de Vallecas has been calculated here.
Air line (approximately)
64 kilometers
34 nautical miles