£55 one way here is a link for all taxi prices from dalaman
http://www.atmairport.aero/Dalaman_en/popup_ter_isl.php

activities unlimited -- i did a return taxi transfer with them from dalaman to olu deniz, £80 return for 2 people 2am and returning 3am , they were brillant. driver made me feel at ease by not driving too fast.
no problems, i was recommended by them as my sister lived there for a long time, and they have a v good reputation,
i have email address if anyone would like it