The calculated distance (air line) between Bilqās and Kawm Ḩamādah is approximately 50 miles respectively 80 kilometers.
By car or train, the actual journey to Kawm Ḩamādah is certainly longer, as only the direct route (as the crow flies) between Bilqās and Kawm Ḩamādah has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles