The calculated distance (air line) between Liberec and Ústí nad Labem is approximately 45 miles respectively 73 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 Liberec and Ústí nad Labem has been calculated here.
Air line (approximately)
73 kilometers
39 nautical miles