The calculated distance (air line) between Neftekumsk and Makhachkala is approximately 175 miles respectively 282 kilometers.
By car or train, the actual journey to Makhachkala is certainly longer, as only the direct route (as the crow flies) between Neftekumsk and Makhachkala has been calculated here.
Air line (approximately)
282 kilometers
152 nautical miles