The calculated distance (air line) between Kostel and Zagorje ob Savi is approximately 43 miles respectively 70 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 Kostel and Zagorje ob Savi has been calculated here.
Air line (approximately)
70 kilometers
38 nautical miles