How do I go from Phuket Airport to Koh Lanta?

The fastest way to get from Phuket Airport (HKT) to Koh Lanta is to bus and Speedboat via By Pass Highway which takes 3h 35m and costs THB900 – THB4500. Is there a direct bus between Phuket Airport (HKT) and Koh Lanta? No, there is no direct bus from Phuket Airport (HKT) to Koh Lanta.