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Most international flights arrive at Incheon (ICN). Gimpo (GMP) handles some short-haul Asian routes. ICN is 60km from central Seoul.
Direct Express train from Incheon Airport to Seoul Station in 43 minutes. ₩11,000. All-stop train ₩9,500 (66 min). Much faster than taxi.
Book 6–8 weeks ahead for cheapest fares. Avoid Golden Week (late April–May), Chuseok, and K-POP concert periods — prices spike 40%+.
Jeju Air, Jin Air, and T'way cover short Asia routes cheaply. For longer hauls, Korean Air and Asiana offer better value + quality than many western carriers.