The calculated distance (air line) between Kassel and Hessisch Lichtenau is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Hessisch Lichtenau is certainly longer, as only the direct route (as the crow flies) between Kassel and Hessisch Lichtenau has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles