The calculated distance (air line) between Sallent and Caldes de Montbui is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Caldes de Montbui is certainly longer, as only the direct route (as the crow flies) between Sallent and Caldes de Montbui has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles