The calculated distance (air line) between Šmartno ob Paki and Slovenj Gradec is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Slovenj Gradec is certainly longer, as only the direct route (as the crow flies) between Šmartno ob Paki and Slovenj Gradec has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles