How to Use the Seoul Subway: Lines, Transfers, Apps

Seoul's subway is one of the most efficient systems in the world, and once you understand the basics, it's the easiest way to get around the city. This guide covers the practical steps: getting a card, reading the lines, transferring correctly, and choosing the right app.

Getting a T-money Card

You need a rechargeable transit card before you board. Options include:

• T-money card: sold at convenience stores (GS25, CU, 7-Eleven) near stations and at subway kiosks, around ₩3,000-4,000 for the card itself
• WOWPASS or Naver Pay-linked cards: also work as transit cards and double as currency exchange tools
• Phone-based T-money: if your phone has an NFC chip compatible with Korean carriers, you can add T-money digitally, though this is inconsistent for foreign iPhones

Top up cash at the machines inside any station — most have an English-language option. Tap the card on the yellow/green reader when entering and again when exiting; fares are calculated by distance and deducted on exit, not entry. If you forget to tap out, you can be charged the maximum fare.

For how to pay for everything else in Korea, including card versus cash situations, see How to Pay in Korea as a Tourist.

Understanding the Line Numbers and Colors

Seoul's subway has over 20 lines, but visitors mainly use these:

Each station has a number code (e.g., Myeongdong is 424) that appears on signs alongside the Korean and English names — useful when pronunciation is tricky. Line 2 is a circular loop and the one most tourists rely on daily since it connects Hongdae, Gangnam, and the areas around Seoul Forest and Konkuk University.

If you're deciding where to base yourself relative to these lines, check Best Areas to Stay in Seoul or the specific breakdowns for Myeongdong, Hongdae, and Gangnam.

How to Transfer Between Lines Without Getting Lost

Transfers (환승) are marked with color-coded signs showing the line number you're switching to. A few practical warnings:

• Some transfer stations require a long walk between platforms — Sadang, Express Bus Terminal, and Wangsimni can take 5-10 minutes on foot. Budget extra time if you're catching a flight or KTX train.
• Follow the exit number (출구) signs, not just the line number, since large stations like Gangnam or Hongik Univ. have 10+ exits leading to very different neighborhoods.
• You do not need to tap out and back in when transferring within the paid zone — only tap again if you fully exit the station.
• Screens above the platform show the next train's final destination, which tells you the direction, since many lines branch.

Subway Apps That Actually Work for Foreigners

Google Maps does not provide real-time transit directions inside Korea, so you'll need a local alternative.

For a full walkthrough of getting Naver Map set up correctly (search, saving places, transit mode), see How to Use Naver Map in Korea as a Foreigner. Having a working data connection matters here — see How to Get a Korea eSIM if you haven't sorted this out before arrival.

Fares and Operating Hours

Base fare is around ₩1,400-1,500 for adults using a T-money card (slightly more for single-journey paper tickets), with a small distance surcharge after about 10 km. Trains run roughly from 5:30 AM to midnight, though exact last-train times vary by line and station — always check the app rather than assuming.

During weekday rush hours (roughly 7:30-9:00 AM and 6:00-8:00 PM), Line 2 and Line 9 get seriously crowded. If you have luggage, avoid these windows or consider a taxi instead.

Subway Etiquette and Practical Rules

• Priority seats (pink or marked sections) are reserved for elderly, pregnant, or disabled passengers, even if the train is packed — don't sit there.
• Eating on the subway is generally frowned upon; drinking water is fine.
• Keep phone calls quiet or set to silent mode with earbuds.
• Doors close quickly and without much warning — don't rush to squeeze in.

Once you're comfortable with the subway, it becomes the backbone of getting around for day trips across the city, including most stops in a realistic 5-Day Seoul Itinerary. If you're arriving from the airport, the AREX line connects directly to Seoul Station — details in Incheon Airport to Seoul: Train, Bus, Taxi or Private Transfer.