The calculated distance (air line) between Montgat and Sant Cugat del Vallès is approximately 10 miles respectively 16 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 Montgat and Sant Cugat del Vallès has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles