The calculated distance (air line) between Lukovica pri Domžalah and Hrastnik is approximately 19 miles respectively 30 kilometers.
By car or train, the actual journey to Hrastnik is certainly longer, as only the direct route (as the crow flies) between Lukovica pri Domžalah and Hrastnik has been calculated here.
Air line (approximately)
30 kilometers
16 nautical miles