The calculated distance (air line) between Šentilj v Slov. Goricah and Kočevje is approximately 81 miles respectively 130 kilometers.
By car or train, the actual journey to Kočevje is certainly longer, as only the direct route (as the crow flies) between Šentilj v Slov. Goricah and Kočevje has been calculated here.
Air line (approximately)
130 kilometers
70 nautical miles