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