The calculated distance (air line) between Sv. Ana v Slov. Goricah and Slovenj Gradec is approximately 38 miles respectively 60 kilometers.
By car or train, the actual journey to Slovenj Gradec is certainly longer, as only the direct route (as the crow flies) between Sv. Ana v Slov. Goricah and Slovenj Gradec has been calculated here.
Air line (approximately)
60 kilometers
33 nautical miles