The calculated distance (air line) between Al ‘Alamayn and Ḩalwān is approximately 156 miles respectively 251 kilometers.
By car or train, the actual journey to Ḩalwān is certainly longer, as only the direct route (as the crow flies) between Al ‘Alamayn and Ḩalwān has been calculated here.
Air line (approximately)
251 kilometers
135 nautical miles