The calculated distance (air line) between Al Yāmūn and Dayr al Balaḩ is approximately 90 miles respectively 145 kilometers.
By car or train, the actual journey to Dayr al Balaḩ is certainly longer, as only the direct route (as the crow flies) between Al Yāmūn and Dayr al Balaḩ has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles