Last year we booked early in the year for december to include the new year and got it for £640 each which was quite good as it never was as good for the remainder of the year.
Including the new year along with christmas makes a big difference ,as you can get reasonable priced fares if you choose to return before new year but its not the same comming back before new years eve , so my advise is if you have definite dates book up asap. M