Istanbul vs Seoul

Istanbul

Istanbul has a transitional climate between Mediterranean and oceanic, with hot summers and cool, rainy winters. The Bosphorus creates microclimates — the Asian side tends to be slightly warmer than the European side.

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.

Istanbul

Istanbul has an expanding metro, tram, funicular, and ferry network all accessible with the Istanbulkart rechargeable transit card. Get one immediately at any metro station or kiosk — single tickets are expensive. Traffic is notoriously bad, so use rail and ferries whenever possible.

Walkability: The historic peninsula (Sultanahmet, Eminonu, Bazaar Quarter) is very walkable but hilly. The Beyoglu/Galata area involves steep hills and stairs. The Asian side neighborhoods of Kadikoy and Moda are flat and pleasant on foot. Traffic and wide highways make some areas pedestrian-unfriendly.

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.