The calculated distance (air line) between Nowe Miasto Lubawskie and Gdańsk is approximately 75 miles respectively 121 kilometers.
By car or train, the actual journey to Gdańsk is certainly longer, as only the direct route (as the crow flies) between Nowe Miasto Lubawskie and Gdańsk has been calculated here.
Air line (approximately)
121 kilometers
65 nautical miles