The calculated distance (air line) between Čáslav and Ústí nad Labem is approximately 79 miles respectively 127 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 Čáslav and Ústí nad Labem has been calculated here.
Air line (approximately)
127 kilometers
69 nautical miles