The calculated distance (air line) between Al Mansurah and Ḩalwān is approximately 83 miles respectively 133 kilometers.
By car or train, the actual journey to Ḩalwān is certainly longer, as only the direct route (as the crow flies) between Al Mansurah and Ḩalwān has been calculated here.
Air line (approximately)
133 kilometers
72 nautical miles