The calculated distance (air line) between Ginsheim-Gustavsburg and Niedernhausen is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Niedernhausen is certainly longer, as only the direct route (as the crow flies) between Ginsheim-Gustavsburg and Niedernhausen has been calculated here.
Air line (approximately)
21 kilometers
12 nautical miles