The calculated distance (air line) between Sangīn and Lashkar Gāh is approximately 43 miles respectively 69 kilometers.
By car or train, the actual journey to Lashkar Gāh is certainly longer, as only the direct route (as the crow flies) between Sangīn and Lashkar Gāh has been calculated here.
Air line (approximately)
69 kilometers
37 nautical miles