The calculated distance (air line) between Alcobendas and San Agustín del Guadalix is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to San Agustín del Guadalix is certainly longer, as only the direct route (as the crow flies) between Alcobendas and San Agustín del Guadalix has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles