The calculated distance (air line) between Khadzhalmakhi and Makhachkala is approximately 42 miles respectively 67 kilometers.
By car or train, the actual journey to Makhachkala is certainly longer, as only the direct route (as the crow flies) between Khadzhalmakhi and Makhachkala has been calculated here.
Air line (approximately)
67 kilometers
36 nautical miles