The calculated distance (air line) between Cardona and Caldes de Montbui is approximately 32 miles respectively 51 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 Cardona and Caldes de Montbui has been calculated here.
Air line (approximately)
51 kilometers
28 nautical miles