Seoul Arrival Guide: the AREX, T-money and a City That Rewards the Subway

One airport, built far out

Seoul’s international traffic lands at Incheon (ICN), the giant hub on a reclaimed island 50 km west of the city — routinely rated among the world’s best airports, with fast immigration, free luggage carts and a transit hall that flows. Gimpo (GMP) handles the domestic shuttle market and a handful of short international routes (Tokyo Haneda, Beijing among them), so if your itinerary connects through Korea, check which airport each leg uses: Incheon–Gimpo transfers are a genuine logistical item, not a walk.

The structural fact is distance: Incheon is far, and every transfer option is built around the AREX rail line that connects the airport to Seoul Station downtown. There is no genuine airport-choice decision for visitors — only the choice of train.

Getting into the city: AREX Express, All-Stop, buses and taxis (2026 fares)

The AREX Express is the premium pick: nonstop from Incheon T1/T2 to Seoul Station in 43 minutes for a flat ₩13,000 adult, with reserved seating and luggage racks — bookable at the station or in apps, and direct connections to the KTX high-speed platforms and Line 1/Line 4 subways at Seoul Station. The All-Stop commuter train rides the same corridor with intermediate stops for roughly ₩4,200–5,000 depending on destination — about 60 minutes to Seoul Station, and it taps with the same T-money card you will use all week.

Airport limousine buses (about ₩16,000–19,000) deliver to hotel districts door-ish — the honest choice when your bag is heavy and your hotel sits off a subway exit. Taxis to downtown run ₩70,000–90,000 including tolls; late-night surcharges apply. The decision rule: luggage plus a schedule, Express train; budget with patience, All-Stop; a hotel far from any station, the limousine bus; three-plus travellers, a taxi divides fine.

First-day practicalities: K-ETA, T-money, data and the Korean clock

Entry: visa-waiver travellers generally need the K-ETA travel authorisation (₩10,000, online, valid two years) — but Korea has shifted nationalities on and off a temporary exemption list by year, so check your passport’s status when you book rather than trusting any fixed rule. Immigration at Incheon is famously efficient; the arrivals hall flows to the AREX in minutes.

Get a T-money card at the airport convenience store (a few thousand won with starter credit) and it runs every subway line, city bus and many taxis — or simply tap a contactless bank card where accepted. Data: Korean eSIMs and airport SIMs are cheap and excellent; the city’s free Wi-Fi is everywhere but the eSIM removes the friction. Money: cards work almost universally, but street-food stalls and traditional markets still enjoy cash — carry ₩20,000–50,000.

The rhythm: Seoul eats late and wakes early — the subway runs until around midnight, cafes run forever, and neighbourhoods like Hongdae and Itaewon stay loud past 2 am. Meals arrive fast (the “banchan arrives the moment you sit” clock), tipping does not exist, and the underground shopping malls make a rainy plan irrelevant — Seoul is one of the few megacities where weather almost never edits the itinerary.

Getting around Seoul: the subway lines that matter, buses and the Han river

The Seoul Metropolitan Subway is the arguable best in the world for visitors: lines numbered and colour-coded, station announcements in four languages, exit numbers that match the maps in every hotel, and fares that start around ₩1,400–1,500 and barely move. Learn five: Line 1 (the old spine), Line 2 (the loop through Gangnam, Hongdae and City Hall), Line 4 (Myeongdong and the palaces’ side), Line 5 (the Incheon–Gimpo airport corridor) and Line 9 (the express-y Gangnam line). Naver Map or KakaoMap beat Google for walking directions and bus timings.

Buses fill the gaps and read on T-money; the Han river parks (Hangang) are the weekend lung — rent a bike at Yeouido or Ttukseom and the city shows its second face. Taxis are metered, cheap for short hops and fine to hail — the orange ones at least; black deluxe taxis charge more for no tourist benefit.

Where to base yourself: five areas, five different trips

Myeongdong and Chungmuro are the classic first-visit pick: shopping, street food, the palaces and Insa-dong walkable, airport limousine buses at the door. Hongdae is the youthful one: indie music, night markets, the cheapest good food and Line 2 connections — loud on weekends by design. Gangnam (Sinsa, Apgujeong) suits the business-and-shopping traveller with upscale everything and Line 9 speed. Insadong/Jongno puts you inside the history: palaces, hanok lanes, teahouses, and the slowest-paced mornings in the city. Itaewon is the international one: global food, expat services, and the best late-night diversity of any district.

Prices flex with Korean holiday weeks (Lunar New Year, Chuseok) when the city empties and hotel rates dip — that is the savvy-traveller window. What is stable: neighbourhood hotels undercut the big-brand towers at similar locations, and anywhere on Line 2 keeps you one ride from both halves of the river.

The mistakes that ruin first days (and the fixes)

Trusting the All-Stop train with a tight schedule: it is 20–25 minutes slower than the Express and stops matter — match the train to the clock, not just the wallet. Landing at Gimpo and heading to an Incheon-hotel shuttle: check which airport your arrival uses. Paying cash for the subway: T-money or contactless is faster and fare-capped. Eating in Myeongdong’s main drag every night: the alleys behind it, and Hongdae’s side streets, eat better for half. Planning Gangnam and Jongno for the same morning: the city is bigger than the map promises — one river-crossing per day. And the classic: skipping the palace hanbok trick — wearing rented hanbok gets you into Gyeongbokgung free, which is the best two-for-one in Korean tourism.