The calculated distance (air line) between Bischofsheim in der Rhön and Hannover is approximately 137 miles respectively 220 kilometers.
By car or train, the actual journey to Hannover is certainly longer, as only the direct route (as the crow flies) between Bischofsheim in der Rhön and Hannover has been calculated here.
Air line (approximately)
220 kilometers
119 nautical miles