The calculated distance (air line) between Hammam Bou Hadjar and Mostaganem is approximately 71 miles respectively 114 kilometers.
By car or train, the actual journey to Mostaganem is certainly longer, as only the direct route (as the crow flies) between Hammam Bou Hadjar and Mostaganem has been calculated here.
Air line (approximately)
114 kilometers
61 nautical miles