The calculated distance (air line) between Nowe Miasto Lubawskie and Białystok is approximately 149 miles respectively 239 kilometers.
By car or train, the actual journey to Białystok is certainly longer, as only the direct route (as the crow flies) between Nowe Miasto Lubawskie and Białystok has been calculated here.
Air line (approximately)
239 kilometers
129 nautical miles