Verify the actual terminal
Incheon states that codeshare and airline circumstances can change the operating terminal.
Airside transfer
Official transfer maps show security and shuttle-train steps for specific terminal pairs.
Landside transfer
Airport Railroad and shuttle options serve inter-terminal movement outside the protected transfer path.
Keep both flight numbers handy
Use the official flight search for departure terminal, check-in and gate information.
Official sources
AirportBoard separates editorial planning from live operational decisions. Re-check airport and airline information on travel day.
More ICN planning guides
Incheon Airport to Seoul: AREX, Bus or Taxi
How to use Airport Railroad and compare it with buses and taxis from ICN.
Incheon Terminal 1 to Terminal 2: Transfer and Shuttle Guide
A practical ICN terminal-transfer guide for protected connections and landside moves.
Self-Transfer Flights: The Airport Checklist That Prevents Missed Connections
A reusable checklist for separate-ticket connections where the airline does not protect the onward flight.