The calculated distance (air line) between Fuhlsbüttel and Braunschweig is approximately 97 miles respectively 156 kilometers.
By car or train, the actual journey to Braunschweig is certainly longer, as only the direct route (as the crow flies) between Fuhlsbüttel and Braunschweig has been calculated here.
Air line (approximately)
156 kilometers
84 nautical miles