The calculated distance (air line) between Akhtubinsk and Kalach-na-Donu is approximately 124 miles respectively 200 kilometers.
By car or train, the actual journey to Kalach-na-Donu is certainly longer, as only the direct route (as the crow flies) between Akhtubinsk and Kalach-na-Donu has been calculated here.
Air line (approximately)
200 kilometers
108 nautical miles