The calculated distance (air line) between Benátky nad Jizerou and Karviná is approximately 168 miles respectively 270 kilometers.
By car or train, the actual journey to Karviná is certainly longer, as only the direct route (as the crow flies) between Benátky nad Jizerou and Karviná has been calculated here.
Air line (approximately)
270 kilometers
146 nautical miles