Gimpo Airport (GMP) Domestic Flight Transfer Guide from Incheon (ICN)

Why domestic flights use a separate airport

Incheon International Airport primarily handles international flights, while most domestic routes within Korea depart from Gimpo Airport, a genuinely separate facility located closer to central Seoul. This split catches some international travelers off guard when a connecting domestic flight isn't simply a different gate at the same airport but requires leaving the international terminal entirely.

Transport options between the two airports

• The AREX (Airport Railroad Express) train connects Incheon Airport directly to Gimpo Airport, with the all-stop service taking longer than the express train that bypasses Gimpo for direct-to-Seoul travelers.
• Airport limousine buses also run between the two airports, a comfortable if sometimes slower alternative depending on traffic.
• A taxi is the fastest but most expensive option, worth considering only if your connection window is genuinely tight.

Timing your connection realistically

Beyond the roughly 40-60 minute transit time between airports, budget time for immigration and customs clearance at Incheon (if arriving internationally), baggage claim and re-check-in at Gimpo, and standard domestic security screening -- treating this connection like any other same-day airport-to-airport transfer, not a quick terminal walk, prevents a missed domestic flight.

Signage throughout Incheon Airport clearly directs passengers toward the AREX platform for a Gimpo connection, and staff at information counters can help confirm the correct train if there's any uncertainty about the route. Domestic check-in counters at Gimpo operate similarly to any other Korean airport, generally opening a set number of hours before departure, so arriving too early can mean a wait before check-in even begins. Because this transfer involves two separate airports rather than a single facility, treating the connection with the same seriousness as a standard international layover helps avoid an unnecessary scramble.