Guia de cidade
Seoul ICN: What to Do on a Layover
Gwangjang Market in 5 hours: bindaetteok, silk alley, oldest market in Korea.
Getting from the airport
ICN to city center: 43 minutes by rail (AREX Express). Fare is $9. Trains run every 30 minutes. Service runs 05:23 to 23:32. Skip the taxi unless your connection is under 5 hours.
What to do in Seoul
The stops worth making: Korean BBQ, DMZ tour, Gyeongbokgung Palace, Myeongdong street food. Rated above 4.4: Gyeongbokgung Palace (4.6), N Seoul Tower (4.5), Bukchon Hanok Village (4.4), Hongdae Street (4.5), Myeongdong Shopping Street (4.4). You do not need the full tourist circuit. Pick two and commit.
Visa and entry
Seoul is visa-free for US passports. No application, no fee. The border process at ICN is efficient. Expect 15 minutes or less.
How long do you need
The minimum useful layover is 5 hours. That gives you 43 minutes in each direction plus about 124 minutes on the ground. Up to 72 hours is a proper overnight.
ICN airport
ICN has 18 lounges. For short connections under 4 hours, the terminal is the destination: food options, showers, and enough space to reset before the next leg.