The calculated distance (air line) between Montana and Gorna Oryahovitsa is approximately 126 miles respectively 203 kilometers.
By car or train, the actual journey to Gorna Oryahovitsa is certainly longer, as only the direct route (as the crow flies) between Montana and Gorna Oryahovitsa has been calculated here.
Air line (approximately)
203 kilometers
110 nautical miles