The calculated distance (air line) between Nyíregyháza and Dunaújváros is approximately 147 miles respectively 236 kilometers.
By car or train, the actual journey to Dunaújváros is certainly longer, as only the direct route (as the crow flies) between Nyíregyháza and Dunaújváros has been calculated here.
Air line (approximately)
236 kilometers
127 nautical miles