The calculated distance (air line) between Falkenhagener Feld and Halensee is approximately 7 miles respectively 11 kilometers.
By car or train, the actual journey to Halensee is certainly longer, as only the direct route (as the crow flies) between Falkenhagener Feld and Halensee has been calculated here.
Air line (approximately)
11 kilometers
6 nautical miles