I flew to Athens from Doha last summer. Booked my tickets on line with Gulf Air and it cost approximately 2500 QAR. Left Doha around 08:00 (ish) landed in Athens (via Bahrain) at around 14:30 if I remember correctly.
Coming home I took off from Athens around 13:00 landing in Doha sometime around 23:00.
Easy enough journey and no problem to arrange.