The calculated distance (air line) between Rogaška Slatina and Trbovlje is approximately 29 miles respectively 46 kilometers.
By car or train, the actual journey to Trbovlje is certainly longer, as only the direct route (as the crow flies) between Rogaška Slatina and Trbovlje has been calculated here.
Air line (approximately)
46 kilometers
25 nautical miles