How to Transfer from KTX to Incheon Airport Bus SmoothlyAre you arriving in Seoul by KTX from cities like Busan, Daejeon, Daegu, or Gwangju, and wondering how to get to Incheon International Airport (ICN)?You're not alone. Many travelers arrive in Seoul via KTX high-speed train and then need to transfer to an airport limousine bus to catch an international flight.This step-by-step transfer guide..