The calculated distance (air line) between Benátky nad Jizerou and Karlovy Vary is approximately 86 miles respectively 139 kilometers.
By car or train, the actual journey to Karlovy Vary is certainly longer, as only the direct route (as the crow flies) between Benátky nad Jizerou and Karlovy Vary has been calculated here.
Air line (approximately)
139 kilometers
75 nautical miles