The calculated distance (air line) between Bobov Dol and Blagoevgrad is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Blagoevgrad is certainly longer, as only the direct route (as the crow flies) between Bobov Dol and Blagoevgrad has been calculated here.
Air line (approximately)
40 kilometers
21 nautical miles