The calculated distance (air line) between Djelfa and Aïn Oussera is approximately 57 miles respectively 92 kilometers.
By car or train, the actual journey to Aïn Oussera is certainly longer, as only the direct route (as the crow flies) between Djelfa and Aïn Oussera has been calculated here.
Air line (approximately)
92 kilometers
50 nautical miles