The calculated distance (air line) between Puente de Vallecas and San Sebastián de los Reyes is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to San Sebastián de los Reyes is certainly longer, as only the direct route (as the crow flies) between Puente de Vallecas and San Sebastián de los Reyes has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles