The calculated distance (air line) between Sant Just Desvern and Cerdanyola del Vallès is approximately 8 miles respectively 13 kilometers.
By car or train, the actual journey to Cerdanyola del Vallès is certainly longer, as only the direct route (as the crow flies) between Sant Just Desvern and Cerdanyola del Vallès has been calculated here.
Air line (approximately)
13 kilometers
7 nautical miles