The calculated distance (air line) between Preddvor and Zagorje ob Savi is approximately 30 miles respectively 48 kilometers.
By car or train, the actual journey to Zagorje ob Savi is certainly longer, as only the direct route (as the crow flies) between Preddvor and Zagorje ob Savi has been calculated here.
Air line (approximately)
48 kilometers
26 nautical miles