The calculated distance (air line) between Idrija and Zagorje ob Savi is approximately 47 miles respectively 76 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 Idrija and Zagorje ob Savi has been calculated here.
Air line (approximately)
76 kilometers
41 nautical miles