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.