Flight Istanbul Atatürk Airport departs from Istanbul Istanbul Atatürk Airport at 18:20 and arrives at Barcelona Barcelona–El Prat Airport at 21:00.
The flighttime is about 3h 40m. The distance travelled ("as the bird flies"): 2973 Km. So the average speed is roughly 811 Km.
There is an 1 hour time difference between Istanbul and Barcelona