The calculated distance (air line) between Kotel and Veliko Tŭrnovo is approximately 44 miles respectively 70 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Kotel and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
70 kilometers
38 nautical miles