The calculated distance (air line) between Falkenhagener Feld and Heiligensee is approximately 5 miles respectively 9 kilometers.
By car or train, the actual journey to Heiligensee is certainly longer, as only the direct route (as the crow flies) between Falkenhagener Feld and Heiligensee has been calculated here.
Air line (approximately)
9 kilometers
5 nautical miles