The calculated distance (air line) between Nowy Dwór Mazowiecki and Bielany is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Bielany is certainly longer, as only the direct route (as the crow flies) between Nowy Dwór Mazowiecki and Bielany has been calculated here.
Air line (approximately)
21 kilometers
12 nautical miles