e-Arrival Card
Korea's official e-Arrival Card is free. Filing opens 3 days before arrival, based on Korean Standard Time. A submitted card stays valid for 72 hours. You don't need to bring it to immigration, but the issuance number sent to your email can help.
Not required for K-ETA holders (unless entering on a visa), registered foreign residents, holders of certain group e-visas, and foreign flight crew. The official site is e-arrivalcard.go.kr.
- e-Arrival Card official guide · official site
- e-Arrival Card: who must file · official site