The calculated distance (air line) between Pleven and Veliko Tŭrnovo is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Pleven and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
90 kilometers
49 nautical miles