The calculated distance (air line) between Písek and Ústí nad Labem is approximately 94 miles respectively 151 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 Písek and Ústí nad Labem has been calculated here.
Air line (approximately)
151 kilometers
81 nautical miles