The calculated distance (air line) between Sarpol-e Z̄ahāb and Aleshtar is approximately 143 miles respectively 231 kilometers.
By car or train, the actual journey to Aleshtar is certainly longer, as only the direct route (as the crow flies) between Sarpol-e Z̄ahāb and Aleshtar has been calculated here.
Air line (approximately)
231 kilometers
124 nautical miles