Flight Changi Airport departs from Singapore Changi Airport at 23:30 and arrives at Dusseldorf Düsseldorf Airport at 06:30.
The flighttime is about 13h 00m. The distance travelled ("as the bird flies"): 10263 Km. So the average speed is roughly 789 Km.
There is an 6 hour time difference between Singapore and Dusseldorf