The calculated distance (air line) between Ḩalwān and Dayr Mawās is approximately 154 miles respectively 249 kilometers.
By car or train, the actual journey to Dayr Mawās is certainly longer, as only the direct route (as the crow flies) between Ḩalwān and Dayr Mawās has been calculated here.
Air line (approximately)
249 kilometers
134 nautical miles