The calculated distance (air line) between Frýdlant nad Ostravicí and Liberec is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Liberec is certainly longer, as only the direct route (as the crow flies) between Frýdlant nad Ostravicí and Liberec has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles