What is the best and cheapest way to get from phuket airport to khao lak?

i will be arriving in phuket at about 7.30 at night and i want to go straight to khao lak its about 2 hrs north of phuket

The cheapest way will always be by bus. Khao Lak is about 74 km north of Phuket. The best way is to arrange with your hotel/resort to pick you up at the airport or take a taxi from the airport to Khao Lak. A taxi from Phuket airport to Khao Lak costs between 1100 and 1600 baht. If you think this is too much and prefer to take a bus, you will have to get to the main road about 3 kilometers from the airport. Hop on a bus headed towards Takua Pa, Ranong or Surat Thani, they all stop in Khao Lak.