The calculated distance (air line) between Varna and Veliko Tŭrnovo is approximately 116 miles respectively 186 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Varna and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
186 kilometers
100 nautical miles