Flight Düsseldorf Airport departs from Dusseldorf Düsseldorf Airport at 13:10 and arrives at Istanbul Istanbul Atatürk Airport at 17:25.
The flighttime is about 3h 15m. The distance travelled ("as the bird flies"): 2680 Km. So the average speed is roughly 825 Km.
There is an 1 hour time difference between Dusseldorf and Istanbul