I booked some for my daughter using Pegasus via Istanbul into Dalaman. They were £198 each which includes luggage from Stansted. As it appears Tommy Cook aren't using Dalaman this Xmas I decided that it was easier for us and her to fly to Dalaman to avoid the longer transfer from Antalya. Her transfer time in Istanbul is only an hour.
Decided to book now because scheduled services such as Pegasus and Turkish airlines won't lower their prices. They have a number of seats at each fare and as they get booked, you have to book their higher fare.