The calculated distance (air line) between Balchik and Veliko Tŭrnovo is approximately 129 miles respectively 208 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Balchik and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
208 kilometers
112 nautical miles