The calculated distance (air line) between Hannover and Halle (Saale) is approximately 114 miles respectively 183 kilometers.
By car or train, the actual journey to Halle (Saale) is certainly longer, as only the direct route (as the crow flies) between Hannover and Halle (Saale) has been calculated here.
Air line (approximately)
183 kilometers
99 nautical miles