The calculated distance (air line) between Stamboliyski and Gorna Oryahovitsa is approximately 91 miles respectively 146 kilometers.
By car or train, the actual journey to Gorna Oryahovitsa is certainly longer, as only the direct route (as the crow flies) between Stamboliyski and Gorna Oryahovitsa has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles