The calculated distance (air line) between Mikulov and Ústí nad Labem is approximately 173 miles respectively 279 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 Mikulov and Ústí nad Labem has been calculated here.
Air line (approximately)
279 kilometers
150 nautical miles