The calculated distance (air line) between San Agustín del Guadalix and Valladolid is approximately 89 miles respectively 143 kilometers.
By car or train, the actual journey to Valladolid is certainly longer, as only the direct route (as the crow flies) between San Agustín del Guadalix and Valladolid has been calculated here.
Air line (approximately)
143 kilometers
77 nautical miles