Flight Barcelona–El Prat Airport departs from Barcelona Barcelona–El Prat Airport at 18:25 and arrives at Istanbul Istanbul Atatürk Airport at 23:50.
The flighttime is about 4h 25m. The distance travelled ("as the bird flies"): 2973 Km. So the average speed is roughly 673 Km.
There is an 1 hour time difference between Barcelona and Istanbul