The calculated distance (air line) between Falkenhagener Feld and Frohnau is approximately 8 miles respectively 12 kilometers.
By car or train, the actual journey to Frohnau is certainly longer, as only the direct route (as the crow flies) between Falkenhagener Feld and Frohnau has been calculated here.
Air line (approximately)
12 kilometers
7 nautical miles