The calculated distance (air line) between Sants-Montjuïc and Sant Cugat del Vallès is approximately 8 miles respectively 12 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 Sants-Montjuïc and Sant Cugat del Vallès has been calculated here.
Air line (approximately)
12 kilometers
7 nautical miles