The calculated distance (air line) between Astrakhan and Terekli-Mekteb is approximately 184 miles respectively 296 kilometers.
By car or train, the actual journey to Terekli-Mekteb is certainly longer, as only the direct route (as the crow flies) between Astrakhan and Terekli-Mekteb has been calculated here.
Air line (approximately)
296 kilometers
160 nautical miles