The calculated distance (air line) between Pernik and Veliko Tŭrnovo is approximately 136 miles respectively 218 kilometers.
By car or train, the actual journey to Veliko Tŭrnovo is certainly longer, as only the direct route (as the crow flies) between Pernik and Veliko Tŭrnovo has been calculated here.
Air line (approximately)
218 kilometers
118 nautical miles