The calculated distance (air line) between Bayt Lāhyā and Al Bīrah is approximately 49 miles respectively 79 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 Lāhyā and Al Bīrah has been calculated here.
Air line (approximately)
79 kilometers
43 nautical miles