KRW 17,000 gets you from ICN to Gangnam/Express Bus Terminal overnight

N6000 runs all night from ICN T1 and T2 to Gangnam Express Bus Terminal for KRW 17,000, with a stated journey time of about 40–70 minutes. It targets the southern Seoul corridor around Gangnam and Seocho when the AREX and Line 9 are shut, so think of it as the late-night workhorse, not a premium airport limousine.

Departures hit roughly every 30–60 minutes depending on the hour, and Reddit reports 30–40 minute gaps in the very late window around 01:00–03:00. If you land at 00:30 in T1 or T2 and clear immigration in 30–40 minutes, this is usually the cheapest direct option to Gangnam that does not require a transfer at Seoul Station or Gongdeok.

The route ends at Gangnam Express Bus Terminal in Seocho-gu, putting you near Lines 3, 7, and 9 and a dense hotel strip within about 500–800 meters. If your booking is closer to Gangnam Station (Line 2) or Sinnonhyeon, you are looking at a short 5–10 minute taxi or a 15–20 minute walk once the first subways start around 05:30.

Multiple users on r/korea and r/Seoul mention that Google Maps and Naver estimates can be optimistic, with real trips sliding toward the 70‑minute side because of intermediate stops and occasional overnight road works. Build the buffer; landing at 01:30 and expecting to be in a Gangnam hotel by 02:00 is asking for trouble.

Confusion point: several travelers say the night bus stands at ICN are less clearly labeled in English than the daytime airport limousine desks. At T1 and T2, ignore the big daytime counters and follow the overhead signs for city buses and the lettered bus stops; look for the “N6000” board and double-check that “Gangnam Express Bus Terminal” is printed in either English or “강남고속버스터미널.”

Luggage is the other trade-off: commenters note that N6000 uses regular city-style coaches with tighter luggage space than the wide-bay 6000‑series airport limousines. One r/korea thread mentions that two 23 kg checked suitcases plus a carry-on can feel cramped at busier times around 23:00–01:00, so expect to keep smaller bags by your seat.

Regulars tend to compare N buses against Kakao T’s late-night flat taxi fares, which can hit around KRW 60,000–70,000 from ICN to Gangnam. If the next N6000 is 30–40 minutes away and you are two or three people, splitting a taxi sometimes lands you in Gangnam faster for only KRW 10,000–15,000 more per person.

The smoothest move: buy or top up a T-money card at a CU/GS25 in T1 or T2 before heading to the stop, then tap on for the KRW 17,000 fare instead of digging for bills at 02:00.