The calculated distance (air line) between Nowy Dwór Gdański and Olsztyn is approximately 63 miles respectively 102 kilometers.
By car or train, the actual journey to Olsztyn is certainly longer, as only the direct route (as the crow flies) between Nowy Dwór Gdański and Olsztyn has been calculated here.
Air line (approximately)
102 kilometers
55 nautical miles