Jeju Island vs Seoul

Jeju Island

Jeju has a humid subtropical climate warmer and wetter than mainland Korea. The island receives significant rainfall year-round, especially in summer monsoon season. Hallasan creates a weather divide — the south (Seogwipo) is noticeably milder and sunnier than the north in winter.

Seoul

Seoul has a humid continental climate with four very distinct seasons. Summers are hot and humid with a monsoon season (jangma) in July. Winters are cold and dry with Siberian air masses. Spring and autumn are short but spectacular.

Jeju Island

Jeju has no train network. The practical choice for most visitors is a rental car — the island is not large (roughly 73 km east-west) and driving allows access to the many coastal spots that buses don't reach. Taxis are readily available and affordable by Asian standards.

Walkability: Low island-wide, moderate-to-good within Jeju City center and Seogwipo downtown. Most major attractions require a vehicle to reach — Jeju is not a city you can explore on foot.

Seoul

Seoul has one of the world's best public transit systems. The subway is clean, punctual, and covers virtually everywhere you need to go. Get a T-money card (reloadable transit card) at any convenience store for 2,500 KRW and load it up. It works on subways, buses, and even taxis and convenience stores.

Walkability: Seoul is moderately walkable but spread out. The historic core (Jongno, Insadong, Bukchon) is compact and pleasant on foot. Hilly terrain in some neighborhoods (Bukchon, Itaewon) can be tiring. Use the subway to cover distances between districts and walk within them.