Flight Düsseldorf Airport departs from Dusseldorf Düsseldorf Airport at 20:40 and arrives at Gaziantep International Airport at 01:40.
The flighttime is about 4h 00m. The distance travelled ("as the bird flies"): 3710 Km. So the average speed is roughly 928 Km.
There is an 1 hour time difference between Dusseldorf and Gaziantep