The calculated distance (air line) between Bayt Ūmmar and Al Bīrah is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Al Bīrah is certainly longer, as only the direct route (as the crow flies) between Bayt Ūmmar and Al Bīrah has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles