How to reach from Phuket Airport to Khao Lak
Khao Lak is up north from Phuket Airport whereas Phuket is down south. If you arrive in Phuket airport during the day, you can catch shuttle buses from the main road outside the airport to Khao Lak direction. To be safe, you can ask the shuttles going to Phuket to drop you in a convenient point to catch your bus to Khao Lak rather than paying a lot to a taxi to do the same thing. It won't be wise to go to Phuket and take a bus to Khao Lak as you will waste 45 minutes to reach to Phuket and you wil come back all hat way again. If you arrive late in the evening, you don't have any other choice than taking a taxi. It will cost you around 1200 THB for a 45 minutes to 1 hour drive. LOB packages include hoel transfers. If you already arranged one, they may take you from the airport if you arrive during the day.
I took a air-con public bus from Phuket town to this place for only 85BHT. Taking a taxi will cost you 1500BHT. The ride was very comfortable and they even put on some movies for entertainment although i slept through most of the ride.