The calculated distance (air line) between Nowy Dwór Mazowiecki and Gdynia is approximately 170 miles respectively 274 kilometers.
By car or train, the actual journey to Gdynia is certainly longer, as only the direct route (as the crow flies) between Nowy Dwór Mazowiecki and Gdynia has been calculated here.
Air line (approximately)
274 kilometers
148 nautical miles