The calculated distance (air line) between Šentjur and Zagorje ob Savi is approximately 20 miles respectively 32 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 Šentjur and Zagorje ob Savi has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles