COEX is big — Starfield COEX Mall, the Starfield Library, the aquarium, and a convention center for exhibitions and fairs. Dragging a suitcase around it all day is rough, so store your bag at the directly connected Samseong Station lockers and go light.
Samseong (COEX) coin lockers — 3 banks, about 64 units
The station attached to COEX is Samseong Station (Line 2). It has about 64 coin lockers across 3 banks.
- Toward Exit 5 — 30 units
- Passage toward Exits 1, 2, 7, 8 — 17 units
- Passage toward Exits 3, 4 — 17 units
COEX Mall runs underground from Samseong Exits 5 and 6, so if you are heading straight into the mall, the Exit 5 bank (30 units) is the handiest. Rates are the standard subway scale (4 hours: ₩2,200 small / ₩3,300 medium / ₩4,400 large). See how many of each size are free right now on the Samseong Station page.
What to do at COEX, hands free
- Starfield Library — the giant open bookshelves at the center of the mall. It is a photo spot, so you will want both hands free.
- COEX Aquarium & Starfield COEX Mall — easily half a day of walking.
- Exhibitions & fairs (COEX Convention) — on big event days especially, it is easier to store your case before you go in.
When it is full, and big suitcases
Exhibition days and weekends get busy. Check all three banks (Exit 5 / Exits 1-2-7-8 / Exits 3-4) first. COEX is huge — if you plan to reach the east end (toward Bongeunsa Station), note it is a walk from the Samseong lockers. For a big case, check the large-size availability on the Samseong page before you move, and if your case is borderline, re-check against sizes and prices. Our full Seoul storage guide covers what to do when every locker is taken.
Rates and hours
Rates are the standard subway scale — 4 hours: ₩2,200 small / ₩3,300 medium / ₩4,400 large, then hourly after. Lockers run roughly 05:00-01:00, so if an exhibition or show ends late, pull your bag before then. New to paying at the kiosk? See the full Seoul luggage-storage guide.
Sources: Seoul city official info (Ttota Locker) for rates, use and hours. Bank counts, line and exits from Seoul Open Data. Confirm COEX facility details on official channels.