The calculated distance (air line) between Krnov and Frýdek-Místek is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Frýdek-Místek is certainly longer, as only the direct route (as the crow flies) between Krnov and Frýdek-Místek has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles