Comparing city air terminals
Seoul Station: AREX Seoul Station Basement 2, for AREX express train passengers only. Published check-in and baggage drop 05:20–19:00, with city immigration clearance 05:30–19:00.
Gwangmyeong Station: West side Basement 1, KTX Gwangmyeong. Published city check-in/bag drop 06:30–17:00 for same-day Incheon Airport international travellers. There is no longer a separate immigration clearance at Gwangmyeong; complete immigration at Incheon Airport.
Both list airline acceptance cutoffs of three hours before departure at T1 and three hours 20 minutes at T2. The airlines served vary by location; verify your carrier.
At Seoul Station, access the AREX express platform on Basement 7 after ticketing on Basement 2. At Gwangmyeong, the KTX–airport coach boards near west-side Level 1 Exit 4.
Meeting branch opening hours does not guarantee that you satisfy the flight cutoff. Airside security procedures remain separate. Contacts: Seoul Station 1599-7788, Gwangmyeong 1544-7788.