The calculated distance (air line) between Düsseldorf and Bad Homburg vor der Höhe is approximately 106 miles respectively 170 kilometers.
By car or train, the actual journey to Bad Homburg vor der Höhe is certainly longer, as only the direct route (as the crow flies) between Düsseldorf and Bad Homburg vor der Höhe has been calculated here.
Air line (approximately)
170 kilometers
92 nautical miles