The calculated distance (air line) between Böhl-Iggelheim and Düsseldorf is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Düsseldorf is certainly longer, as only the direct route (as the crow flies) between Böhl-Iggelheim and Düsseldorf has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles