The calculated distance (air line) between Dupnitsa and Veliko Tŭrnovo is approximately 140 miles respectively 225 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Dupnitsa and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
225 kilometers
121 nautical miles