Flight Düsseldorf Airport departs from Dusseldorf Düsseldorf Airport at 17:40 and arrives at London London Gatwick Airport at 18:05.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 774 Km. So the average speed is roughly 546 Km.
There is an 1 hour time difference between Dusseldorf and London