The calculated distance (air line) between Kaliningrad and Lidzbark Warmiński is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Lidzbark Warmiński is certainly longer, as only the direct route (as the crow flies) between Kaliningrad and Lidzbark Warmiński has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles