The calculated distance (air line) between Miklavž na Dravskem Polju and Koper is approximately 115 miles respectively 186 kilometers.
By car or train, the actual journey to Koper is certainly longer, as only the direct route (as the crow flies) between Miklavž na Dravskem Polju and Koper has been calculated here.
Air line (approximately)
186 kilometers
100 nautical miles