Incheon International Airport requires a layover of 24 hours or less for its transit tours. A sufficiently long connection does not by itself establish that you may enter Korea. Visa exemptions and K-ETA obligations depend on nationality, visa status and itinerary. Read the airport's official rules, then verify your own eligibility with the relevant immigration authority; reserving a tour is not an entry permit.
Documents and check-in: Bring your passport and boarding passes for both arriving and departing flights. Even if you booked online, reach your terminal's first-floor Transit Tour Registration Desk at least 30 minutes before the tour starts. Unclaimed bookings can be reallocated to people on the waiting list. If you arrive at the concourse, allow extra time to reach the terminal.
Desks: T1 is on the first floor landside after immigration, near Exits 1–2, desks 19 and 20. T2 is on the first floor landside opposite Exit 4, desks 5 and 6. Tours, prices and inclusions vary; see the official course and booking pages. Online and onsite capacity may be first-come, first-served and programmes may change without notice.
Questions: +82-32-741-3139 (T1) or +82-32-741-0060 (T2). Budget additional time for security and boarding your onward flight.