The calculated distance (air line) between Dubňany and Ústí nad Labem is approximately 182 miles respectively 293 kilometers.
By car or train, the actual journey to Ústí nad Labem is certainly longer, as only the direct route (as the crow flies) between Dubňany and Ústí nad Labem has been calculated here.
Air line (approximately)
293 kilometers
158 nautical miles