The calculated distance (air line) between Kostanjevica na Krki and Jesenice is approximately 76 miles respectively 123 kilometers.
By car or train, the actual journey to Jesenice is certainly longer, as only the direct route (as the crow flies) between Kostanjevica na Krki and Jesenice has been calculated here.
Air line (approximately)
123 kilometers
66 nautical miles