The calculated distance (air line) between Osilnica and Zagorje ob Savi is approximately 44 miles respectively 71 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 Osilnica and Zagorje ob Savi has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles