The calculated distance (air line) between Gŭlŭbovo and Asenovgrad is approximately 51 miles respectively 82 kilometers.
By car or train, the actual journey to Asenovgrad is certainly longer, as only the direct route (as the crow flies) between Gŭlŭbovo and Asenovgrad has been calculated here.
Air line (approximately)
82 kilometers
44 nautical miles