The calculated distance (air line) between Kostanjevica na Krki and Šentilj v Slov. Goricah is approximately 59 miles respectively 95 kilometers.
By car or train, the actual journey to Šentilj v Slov. Goricah is certainly longer, as only the direct route (as the crow flies) between Kostanjevica na Krki and Šentilj v Slov. Goricah has been calculated here.
Air line (approximately)
95 kilometers
51 nautical miles