The calculated distance (air line) between Munsha‘at Abū ‘Umar and Ḩalwān is approximately 85 miles respectively 137 kilometers.
By car or train, the actual journey to Ḩalwān is certainly longer, as only the direct route (as the crow flies) between Munsha‘at Abū ‘Umar and Ḩalwān has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles