The calculated distance (air line) between Sant Quirze del Vallès and Castellbisbal is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Castellbisbal is certainly longer, as only the direct route (as the crow flies) between Sant Quirze del Vallès and Castellbisbal has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles