The calculated distance (air line) between Caldes de Montbui and Castellar del Vallès is approximately 4 miles respectively 7 kilometers.
By car or train, the actual journey to Castellar del Vallès is certainly longer, as only the direct route (as the crow flies) between Caldes de Montbui and Castellar del Vallès has been calculated here.
Air line (approximately)
7 kilometers
4 nautical miles