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