The calculated distance (air line) between Castellbisbal and Sant Cugat del Vallès is approximately 5 miles respectively 9 kilometers.
By car or train, the actual journey to Sant Cugat del Vallès is certainly longer, as only the direct route (as the crow flies) between Castellbisbal and Sant Cugat del Vallès has been calculated here.
Air line (approximately)
9 kilometers
5 nautical miles