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