The calculated distance (air line) between Nowy Dwór Gdański and Białystok is approximately 182 miles respectively 292 kilometers.
By car or train, the actual journey to Białystok is certainly longer, as only the direct route (as the crow flies) between Nowy Dwór Gdański and Białystok has been calculated here.
Air line (approximately)
292 kilometers
158 nautical miles