The calculated distance (air line) between Čáslav and Staré Strašnice is approximately 41 miles respectively 66 kilometers.
By car or train, the actual journey to Staré Strašnice is certainly longer, as only the direct route (as the crow flies) between Čáslav and Staré Strašnice has been calculated here.
Air line (approximately)
66 kilometers
35 nautical miles