Hi - just to let people know who may be interested we did this transfer yesterday. As Liz101 said we were able to get the 3am Pammukale Coach from the Otogar (20 YTL each - £14 in total) - we booked 2 days before at their office and there are many other buses going to Antalya from 6am onwards until 9pm (ish) so no shortage of times.
We had numbered seats and the system worked!
Just out of Fethiye they came around with free coffee / juice / biscuits and cake - and again later with water.
We stopped once to stretch our legs for 20 minutes after an hour and again for 10 minutes after 2 and a half hours. Arrived spot on time at 6.15am at Antalya otogar.
Went across to waiting taxis - asked price for airport - he said 50 YTL - I said 35 YTL or I go for Havas bus (this was a bluff) - we agreed 40 YTL (so another £14).
The journey was under 10 km - took 15 minutes but allow 30 mins if you go between 8am and 7pm as it is mainly on the city ring road which will be busy at peak times. It is important you know which terminal you are going to as they are
very spread out - I heard one person say that they went to the wrong terminal and it was 15 YTL to get a taxi to the right one.
Anyway - we went to terminal 2 - smooth check in process - let us keep water right up until we went into the boarding gate!
All in all our one way flights from Antalya to Manchester cost us 90 YTL each booked a year ago so it was a decent result and an enjoyable experience.
Ian