KRW 18,000 saves you a 1.5-hour late‑night taxi east

N6703 runs from ICN T1 and T2 out to Gwangnaru Station on Seoul’s far east side, aimed at people staying along the Han River past Jamsil who arrive after the subways wind down around midnight. The official fare is KRW 18,000, and typical ride time runs 50–85 minutes, but Reddit regulars warn it can stretch to 90+ minutes once the bus crawls along the river and through traffic lights.

The bus generally comes every 30–60 minutes, so landing at 23:00 at T1 or T2 still gives you a realistic shot at catching it instead of paying KRW 60,000–80,000 for a metered taxi to Gwangnaru. Buy a ticket at the airport bus counters landside in each terminal, or tap a T‑money card on board for the same KRW 18,000 fare; just keep some extra KRW 1,000 notes if you need to top up at a machine before you exit T1 or T2.

From the airport, N6703 runs into Seoul then keeps pushing east along the Han, with the last stretch from central areas out to Gwangnaru alone taking 25–35 minutes depending on signals. One traveler on r/korea mentioned skipping a 1.5‑hour taxi by timing the night bus correctly, but also called the stop‑and‑go section “jet‑lag torture” after a 10+ hour flight, especially with a 23 kg checked bag on their lap.

Seats are standard airport‑limousine style with dim lighting, but they’re not great for sleeping because of the constant braking and turns in the final 30 minutes. Some Seoul transit users mention that N6703 drivers occasionally skip lightly used stops if no one is waiting and no one has pressed the bell, so hit the stop button 1–2 stops before your target and watch the in‑bus display carefully for your station name.

Locals suggest checking Naver Map for live bus location and stop order before you leave ICN, since Naver labels N6703 in English and Korean and shows each intermediate stop between T1, T2, Jamsil, and Gwangnaru. Complaints on r/Seoul focus on weak English signage at Gwangnaru itself, so screenshot the stop name and nearby landmarks in Naver or KakaoMap while you still have solid airport Wi‑Fi at T1 or T2.

What regulars do: If your hotel is near Line 2 or Line 5 west of Gwangnaru, some residents hop off N6703 earlier (for example near Jamsil or Gangdong) and grab a KRW 6,000–10,000 taxi instead of riding all the way to the terminus.
Watch out for: People report wandering 10–15 minutes at 02:00 trying to find the exact Gwangnaru stop with luggage, so pin your hotel and the bus stop in Naver Map before you board.

One tip: Build in at least a 15‑minute buffer between scheduled landing and the next N6703 departure so immigration lines or baggage delays at ICN T1/T2 don’t leave you sitting another 60 minutes in the arrivals hall.