The calculated distance (air line) between Gavà and Sant Cugat del Vallès is approximately 12 miles respectively 20 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 Gavà and Sant Cugat del Vallès has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles