Seoul Subway Guide: How to Navigate the City Like a Local
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The Seoul Metropolitan Subway is one of the world’s great transit systems. Nine million passengers per day, 23 lines, 927 stations (as of 2024), fares that start at ₩1,400, and an average on-time performance that embarrasses most Western transit agencies. It reaches every major neighborhood, connects to the national KTX network, and extends to Incheon Airport via the Airport Railroad Express (AREX).
Learning to use it takes about thirty minutes. This guide covers everything you need.
The T-Money Card
T-Money is the contactless transit card for Seoul and the entire Korean public transport network. Buy it at:
- Any convenience store (GS25, CU, 7-Eleven, Emart24): ₩2,500 deposit + initial charge
- Subway station vending machines: same process
Why T-Money is essential:
- Base fare reduction: ₩100 cheaper than buying a single-use ticket per trip
- Transfer discount: When transferring between subway lines and buses within 30 minutes, you only pay one base fare (not full fare for each)
- Bus-to-subway or subway-to-bus transfers are included in the 30-minute window
- Works on all Seoul subway lines, buses, some taxis, and is accepted at convenience stores as payment
Topping up: At any subway station (vending machines in English) or any convenience store. You can add as much as you want; the card holds balance indefinitely.
Foreign credit cards: Some T-Money cards now accept direct NFC payment from foreign contactless cards, but the T-Money physical card is more reliable. Get the card.
The Key Lines
Seoul’s 23 lines are color-coded and numbered. For tourists, six lines cover virtually everything:
Line 2 (Green Circle): The most important line for tourists. Runs a loop through: Hongdae (Hongik University), Sinchon, City Hall, Euljiro 1-ga, Euljiro 3-ga, Jamsil, COEX (Samseong), Gangnam, and back. If you’re lost in Seoul, Line 2 will eventually get you somewhere useful.
Line 3 (Orange): North-south through the historical district. Connects Gyeongbokgung/Anguk (palaces, Bukchon, Insadong), Euljiro 3-ga (central), and Apgujeong (Gangnam luxury district). Essential for the historical north Seoul circuit.
Line 4 (Blue): North-south. Connects Myeongdong, Seoul Station (KTX), Dongjak, and extends south toward the city boundary. Also reaches Gyeongbokgung station via a connection.
Line 5 (Purple): East-west through central and eastern Seoul. Connects Yeouido (Han River island, Yeouido Cherry Blossom Festival), City Hall, Gwanghwamun, and continues east.
Line 6 (Brown): Covers Itaewon, Gyeongnidan-gil, Hapjeong, and the western entertainment districts. Essential for international restaurants and Itaewon nightlife.
Line 9 (Gold): Express and local services on the same track. The express service (급행, geupaeng) skips most stations and is significantly faster. Connects Gimpo Airport, Yeouido, Express Bus Terminal, and Sinnonhyeon (near Gangnam). One of the most useful lines for covering large distances quickly.
Airport Railroad (AREX): Connects Incheon Airport to Seoul Station directly. Two services: all-stop (₩4,750, 43 minutes to Seoul Station) and direct express (₩9,000, 43 minutes). The all-stop service is the practical choice for most travelers.
Reading the Signs
Subway stations are announced in Korean and English. The announcements follow the pattern: incoming station name, direction, transfer information. The English is clear and consistent.
Platform signage: The yellow line on the floor marks the boarding queue position. Boarding passengers wait on the sides; exiting passengers use the center. This rule is followed more strictly in Seoul than almost any other city.
Transfer stations: Large stations with multiple line transfers have color-coded direction signage. The transfer walk from Line 2 to Line 9 at Express Bus Terminal, for example, takes several minutes through numbered transfer corridors — follow the colors and numbers.
Exit numbers: Stations in Seoul list exits by number (Exit 1 through however many exits). When looking up a restaurant or attraction, noting “Anguk Station, Exit 2” is more useful than an address, since the exit gets you oriented at street level immediately.
Peak Hours and Etiquette
Rush hours: 7:30-9:30am and 5:30-8pm. The trains during these periods are densely packed by Tokyo standards. If you’re carrying luggage, avoid rush hour — the trains don’t accommodate large bags well at peak times.
Seating etiquette: The seats at the ends of each carriage and the center-door area are designated for elderly, pregnant, and disabled passengers. These are pink seats with specific markings. Do not sit in them if you’re a young healthy adult, even if they’re empty when you board — someone who needs them may board at the next station.
Quiet cars: Certain carriages (usually numbered toward the ends of the train) are quiet cars. No phone calls, low-volume music.
Eating on the subway: Prohibited and socially frowned upon. Convenience store purchases should wait.
The T-Money App (for English speakers)
The Subway Korea or Naver Map apps both provide accurate Seoul subway route planning in English. Google Maps works well for Seoul public transit and is a reliable backup.
Kakao Maps (Korean) is technically more accurate for real-time updates but requires Korean language comfort.
T-Money balance app: The official T-Money app allows balance checking and NFC top-up (if your phone supports it). Useful for checking remaining balance before long journeys.
Fares
| Distance | Fare (with T-Money) |
|---|---|
| Under 10km | ₩1,400 |
| 10-40km | ₩1,400 + ₩100 per 5km |
| Over 40km | Add ₩100 per 10km |
A typical cross-city trip (Gyeongbokgung to Gangnam, 18km) costs ₩1,600.
Line 9 express surcharge: None — the express service on Line 9 costs the same as local.
Airport Railroad (all-stop, not direct express): ₩4,750 from Incheon Airport Terminal 1 or 2 to Seoul Station. Direct express: ₩9,000, same route.
Beyond the Subway: Buses
Seoul’s bus system complements the subway for areas not on a line. The city buses are color-coded:
- Blue: Trunk routes across the city
- Green: Local neighborhood connections
- Red: Express buses to suburban areas
- Yellow: Loop routes within specific districts
The T-Money card covers buses as well; the transfer discount between subway and bus applies within the 30-minute window. Google Maps and Naver Maps both give accurate bus directions.
Taxis: Seoul taxis are metered, reasonably priced, and safe. Kakao T app books taxis without a Korean phone number (use the international sign-in option). The call taxi option gives you a car within 3-5 minutes in central Seoul. Standard taxi base fare ₩4,800; taxis at night (midnight-4am) add a 20% surcharge.
Practical Notes
Luggage storage: Available at most major stations (Seoul Station, Hongik University, Express Bus Terminal, Gimpo Airport). ₩1,000-3,000 per piece per day. Useful if checking out of accommodation in the morning but not departing until evening.
Lost and found: Items left on Seoul subway are turned in at astonishingly high rates. The Seoul Metro Lost and Found (1-800-8002-5678) can trace items by station, line, and time of incident.
Accessibility: Seoul’s subway is highly accessible — elevators at virtually all stations, tactile guiding paths on platforms, wheelchair accessible trains. The elevator locations are shown on the station maps (available at any exit or on the Naver Maps app).
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