I guess you mean special offers from travel agencies otherwise booking tickets from airline websites is not that cheap. 1000 euro more or less.
If you want to truly have an awesome experience in Athens, you need a local (as everywhere of course). Athens is not only the tourist attractions as most people think. Far from it actually. But if you are considering a quick trip to Athens, I advise you to bring some friends with you and enjoy the nightlife which is 24/7.
It's a pity though to visit only Athens if you come from this far. Santorini, Corfu, Crete, Kefalonia are a must. Always in the summer of course :)