The calculated distance (air line) between Sv. Ana v Slov. Goricah and Velenje is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Velenje is certainly longer, as only the direct route (as the crow flies) between Sv. Ana v Slov. Goricah and Velenje has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles