The calculated distance (air line) between Devnya and Veliko Tŭrnovo is approximately 98 miles respectively 158 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Devnya and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
158 kilometers
85 nautical miles