The calculated distance (air line) between Tiaret and Aïn Oussera is approximately 90 miles respectively 144 kilometers.
By car or train, the actual journey to Aïn Oussera is certainly longer, as only the direct route (as the crow flies) between Tiaret and Aïn Oussera has been calculated here.
Air line (approximately)
144 kilometers
78 nautical miles