The calculated distance (air line) between Ingelheim am Rhein 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 Ingelheim am Rhein and Düsseldorf has been calculated here.
Air line (approximately)
166 kilometers
90 nautical miles