The calculated distance (air line) between Saḩam al Kaffārāt and Ma'an is approximately 173 miles respectively 278 kilometers.
By car or train, the actual journey to Ma'an is certainly longer, as only the direct route (as the crow flies) between Saḩam al Kaffārāt and Ma'an has been calculated here.
Air line (approximately)
278 kilometers
150 nautical miles