The calculated distance (air line) between Sant Joan de Vilatorrada and Caldes de Montbui is approximately 20 miles respectively 33 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 Sant Joan de Vilatorrada and Caldes de Montbui has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles