The calculated distance (air line) between Dallgow-Döberitz and Ketzin is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Ketzin is certainly longer, as only the direct route (as the crow flies) between Dallgow-Döberitz and Ketzin has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles