Itaewon gets busy after dark — its bars, restaurants and the main strip — so it is worth dropping your bags before you explore. Itaewon Station (Line 6) has coin lockers, so you can leave a suitcase and travel light.
Coin lockers at Itaewon Station
Itaewon Station has T-Locker coin lockers at 2 spots, about 51 in total. Note there are only 9 large lockers, so space for a suitcase is limited. See the spots and how many are free right now, by size, on the Itaewon Station page.
Prices are the same across Seoul — about ₩2,200 (small) to ₩4,400 (large) for four hours, then an hourly charge. The screen offers English and you pay by card, no ID needed.
When they are full
Demand peaks on evenings and weekends, and the large lockers go fast. Check live availability on the station page first; if it is full, try Hangangjin or Noksapyeong (Line 6, one stop away), or see the full Seoul luggage storage guide. There is no staffed desk at Itaewon Station.
Will a suitcase fit?
A large locker is 50 × 90 × 60 cm inside. If you are unsure about a 28-inch case, see locker sizes and prices. With only 9 large units here, for a big suitcase it can be easier to store at a station with more large lockers and ride over to Itaewon.
Sources: prices, sizes and hours from the Seoul Metropolitan Government (T-Locker); spots, counts and availability from Seoul Open Data.