Flight Zürich Airport departs from Zurich Zürich Airport at 09:05 and arrives at Athens Athens International Airport Eleftherios Venizelos at 12:50.
The flighttime is about 2h 45m. The distance travelled ("as the bird flies"): 1989 Km. So the average speed is roughly 723 Km.
There is an 1 hour time difference between Zurich and Athens