The calculated distance (air line) between Šmartno ob Paki and Maribor is approximately 33 miles respectively 53 kilometers.
By car or train, the actual journey to Maribor is certainly longer, as only the direct route (as the crow flies) between Šmartno ob Paki and Maribor has been calculated here.
Air line (approximately)
53 kilometers
29 nautical miles