Travelling from most locations, it is best to book your flight to Athens during the month of February for the best deal, although there are other times of the year which offer great deals as well.
In general, most flyers find the cheapest time to book a flight to Athens is about 60 days prior.
In general, booking your departure to Athens for a Monday represents the best deal on airfare. Try to avoid a Saturday departure to stay away from the highest prices.
On average you can find the best deals on plane tickets to Athens when looking for flights with midday departure times.