The calculated distance (air line) between Gorna Oryahovitsa and Dupnitsa is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Dupnitsa is certainly longer, as only the direct route (as the crow flies) between Gorna Oryahovitsa and Dupnitsa has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles