Flight Düsseldorf Airport departs from Dusseldorf Düsseldorf Airport at 07:30 and arrives at London City Airport at 08:00.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 747 Km. So the average speed is roughly 498 Km.
There is an 1 hour time difference between Dusseldorf and London