按目前IATA规则，中国护照持美签在棒子国转机不能免签入境（以前是持美签往返美国可以各进棒子国30天）
Visa required.
Visa Exemptions:
Passengers with a Hong Kong (SAR China) passport for a maximum stay of 90 days.
Passengers with a Macao (SAR China) passport for a maximum stay of 90 days.
TWOV (Transit Without Visa):
Passengers transiting through Seoul (ICN) with a confirmed onward ticket for a flight to a third country within 24 hours. They must stay in the international transit area of the airport and have documents required for the next destination.
Passengers transiting through Seoul (ICN) with a confirmed onward ticket for a flight to a third country within 72 hours.
They must:
- join a transit tour organized by Seoul (ICN), and
- have documents required for the next destination.
Passengers with a confirmed onward ticket for a flight to a third country on the same calendar day. They must stay in the international transit area of the airport and have documents required for the next destination.
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与航空公司确认、与韩国使馆确认是否可行噢

免签过境好像疫情之后就没有了。非联程的话，你需要签证

棒子转机去美国可以免签30天，不过最好跟大韩航空确认清楚，免得他们不给你发登机牌。

非联程机票需要入境就需要签证。