The calculated distance (air line) between Brezovica pri Ljubljani and Slovenj Gradec is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Slovenj Gradec is certainly longer, as only the direct route (as the crow flies) between Brezovica pri Ljubljani and Slovenj Gradec has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles