The calculated distance (air line) between Šentilj v Slov. Goricah and Krško is approximately 50 miles respectively 81 kilometers.
By car or train, the actual journey to Krško is certainly longer, as only the direct route (as the crow flies) between Šentilj v Slov. Goricah and Krško has been calculated here.
Air line (approximately)
81 kilometers
44 nautical miles