The calculated distance (air line) between Opava and Frýdek-Místek is approximately 27 miles respectively 43 kilometers.
By car or train, the actual journey to Frýdek-Místek is certainly longer, as only the direct route (as the crow flies) between Opava and Frýdek-Místek has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles