The calculated distance (air line) between Ludweiler-Warndt and Friedrichsthal is approximately 15 miles respectively 24 kilometers.
By car or train, the actual journey to Friedrichsthal is certainly longer, as only the direct route (as the crow flies) between Ludweiler-Warndt and Friedrichsthal has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles