The calculated distance (air line) between Nowy Dwór Mazowiecki and Katowice is approximately 167 miles respectively 268 kilometers.
By car or train, the actual journey to Katowice is certainly longer, as only the direct route (as the crow flies) between Nowy Dwór Mazowiecki and Katowice has been calculated here.
Air line (approximately)
268 kilometers
145 nautical miles