The calculated distance (air line) between Rogaška Slatina and Kočevje is approximately 55 miles respectively 89 kilometers.
By car or train, the actual journey to Kočevje is certainly longer, as only the direct route (as the crow flies) between Rogaška Slatina and Kočevje has been calculated here.
Air line (approximately)
89 kilometers
48 nautical miles