The calculated distance (air line) between Jablonec nad Nisou and Karviná is approximately 160 miles respectively 258 kilometers.
By car or train, the actual journey to Karviná is certainly longer, as only the direct route (as the crow flies) between Jablonec nad Nisou and Karviná has been calculated here.
Air line (approximately)
258 kilometers
139 nautical miles