The calculated distance (air line) between Nieder-Ingelheim and Düsseldorf is approximately 103 miles respectively 166 kilometers.
By car or train, the actual journey to Düsseldorf is certainly longer, as only the direct route (as the crow flies) between Nieder-Ingelheim and Düsseldorf has been calculated here.
Air line (approximately)
166 kilometers
89 nautical miles