Thailand KingPower Duty Free Store website. King Power Duty Free Thailand is a part of King Power International Group, which is a collection of many world fashionable and popular brands with elegant and comfortable shopping space. It has eight branches including King Power Bangkok City Center, King Power Bangkok Suvarnabhumi International Airport, King Power Bangkok Swanley, King Power Bangkok Langman Airport, Pattaya City, Phuket International Airport, Hat Yai Airport and Chiang Mai International Airport.