Very easy to get to Saklikent Gorge from Fethiye on the Dolmus. There is a 'standard' dolmus which goes from the road adjacent to the station, but this stops in many villages, can be very crowded and takes quite a while.
Four of us went last week and opted to go on the 'direct' bus, seemingly managed/organised from the cafe on the corner of the road adjacent to the station. For 20TL each we had guaranteed seats on a large, air conditioned dolmus. Departing at 10.30am, we stopped twice on the way to Saklikent, once at Yaka Park and again at Tlos (both WELL worth seeing).
Arrived in Saklikent around 12.30 and had 4.5 hours there. The driver waited, checked us all back on to the dolmus, and then took us directly back in under an hour. He even took us on to Calis at no extra charge. Great value for money...the same deal as an 'organised' trip to Saklikent for a fraction of the cost.