Field Notes / Transport

Trains and Buses in South Korea: How They Work

2026-06 6 min read EN

At a glance — Korea's rail network (KTX, SRT, ITX, Mugunghwa) covers most of the country, backed up by a dense web of express and intercity bus routes. Seoul to Busan takes about 2 h 15 by high-speed train, or 4 h 15 to 4 h 40 by bus. Jeju, being an island, is reached by domestic flight.

High-speed trains: KTX and SRT

As of 2026, two operators still share the high-speed rail network.

  • KTX (Korean Train eXpress), run by Korail, departs from Seoul Station. It serves Daejeon, Daegu, and Busan, plus Gwangju, Mokpo, Yeosu, Gangneung, and Jeonju depending on the line.
  • SRT (Super Rapid Train), run by SR, departs from Suseo Station in southeast Seoul (Line 3 / Suin-Bundang). It covers the Gyeongbu axis (to Busan via Daejeon and Dongdaegu) and the Honam axis (to Gwangju and Mokpo).

On the Seoul–Busan run, count on about 2 h 15 on the KTX from Seoul Station and about 2 h 10 on the SRT from Suseo, with several dozen departures a day. The SRT is generally a touch cheaper (roughly 10% less) and runs on dedicated lines.

Worth noting: a gradual merger of the two operators was announced for 2026 and is being rolled out in stages. When you arrive, check which station (Seoul or Suseo) has the departure that suits you best — the situation is still shifting over the coming months.

Ballpark high-speed fares (standard seat, full fare):

  • Seoul → Busan: about ₩59,000 (~$65)
  • Seoul → Daejeon: about ₩24,000 (~$26)
  • Seoul → Daegu: about ₩45,000 (~$50)
  • Seoul → Gwangju (Songjeong): about ₩47,000 (~$52)

Prices vary with the day, how far in advance you book, and the class (standard or first class). Reserve a few days ahead for weekends, school holidays, and long weekends, when trains fill up fast.

Slower trains: ITX and Mugunghwa

Alongside the high-speed services, Korail also runs classic trains that come in handy for regional travel and shorter hops.

  • ITX-Saemaeul / ITX-Maum / ITX-Cheongchun: semi-express trains, roughly 150–180 km/h, with comfortable seats and good value on medium-distance routes (for example, Seoul → Chuncheon on the ITX-Cheongchun).
  • Mugunghwa: a regional train, slower (≈120 km/h), with more frequent stops and lower fares. On Seoul → Busan, expect upwards of 5 h 30 and a fare in the region of ₩28,000 (~$31).

These trains are handy for reaching less touristy cities (for example, Andong, Suncheon, or Mokpo via the classic line). You book them through the same channels as the KTX.

KORAIL Pass. A pass aimed at international tourists, sold on Korail's English site. It comes in consecutive (3 or 5 days) and flexible (2 or 4 days within 10) versions. Ballpark adult fares for 2026: 3 consecutive days about ₩165,000 ($115), 5 days about ₩244,000 ($170), and Flex 4 days within 10 about ₩233,000 (~$163). It covers KTX, ITX, and Mugunghwa, but not the SRT. It pays off if you string together several long-distance trips (Seoul → Busan → Gwangju → Seoul); for a simple Seoul–Busan round trip, point-to-point tickets work out cheaper. You can book in English on letskorail.com (Korail's international portal) or through third-party platforms like Klook and Trazy, which often smooth over foreign-card payment issues for you.

Express and intercity buses

Buses remain heavily used in Korea: a dense network, frequent departures, and fares noticeably lower than the train. There are two categories to tell apart:

  • Express buses (gosok): long-distance routes between major cities, with few or no intermediate stops. Official platform: kobus.co.kr.
  • Intercity buses (si-oe): small and mid-sized cities, with more stops. Official platform: txbus.t-money.co.kr.

Express buses come in three classes:

  • Standard (Ilban): 2+2 layout, lowest fare.
  • Premium (Udeung): 1+2 or 2+2 layout with more space and a deeper recline.
  • Premium / Luxury: near-lie-flat seats (21 places), an individual screen, a USB port, and side dividers.

Seoul → Busan by express bus from Seoul Express Bus Terminal (Gangnam):

  • Duration: 4 h 15 to 4 h 40 depending on traffic
  • Standard: about ₩24,000 (~$26)
  • Premium: about ₩35,000 to ₩50,000 (~$38 to $55)
  • Departures every 15 to 30 minutes, from early morning until after midnight

Booking kobus.co.kr from abroad — what to know: there is an English interface, but payment often fails with foreign cards, and some pages require a Korean phone number. Workarounds: buy at the terminal counter on the day (usually doable outside peak season), use the 고속버스티머니 / T-money Express Bus app, or book through third-party platforms like Klook or Trip.com. For intercity buses, txbus.t-money.co.kr accepts some foreign cards.

City metro and buses: T-money and Climate Card

In every major city (Seoul, Busan, Daegu, Daejeon, Gwangju, Incheon), you pay for the metro and city buses with a rechargeable T-money card. The card itself costs about ₩3,000 (~$2) at convenience stores (GS25, CU, 7-Eleven, Emart24 — they're everywhere, including Incheon Airport). You top it up with cash at station kiosks or in convenience stores.

The Seoul metro charges by distance: most trips run between ₩1,400 and ₩2,000 (~$1 to $1.50).

In Seoul, the Climate Card (Tourist Pass) is a fixed-duration pass that gives unlimited access to the Seoul metro and city buses, plus the Ttareungi bike-share. Tourist fares for 2026:

  • 1 day: ₩5,000
  • 2 days: ₩8,000
  • 3 days: ₩10,000
  • 5 days: ₩15,000

It's sold at convenience stores and metro information centers (a ₩3,000 cash deposit applies for the physical card). One catch to bear in mind: the Climate Card doesn't work on the AREX line beyond Seoul Station — for the Incheon Airport → Seoul ride, pay separately with T-money or cash.

In Busan, you also pay for the metro and bus network with T-money (the local Cashbee card is interchangeable in practice). There's no direct equivalent to the Climate Card on the Busan side in 2026.

Common routes and tips

Busan ↔ Gyeongju. The simplest option is the express bus from Busan Central Terminal (Nopo), the terminus of Busan metro Line 1. The trip takes about 50 minutes to 1 hour, costs in the region of ₩6,000 to ₩8,000, with departures every 30 minutes. By train, there's a KTX Busan → Singyeongju, but Singyeongju Station sits 8 km from the historic center and means a bus transfer.

To Jeju. The island isn't served by train. The standard option is a domestic flight from Gimpo (Seoul) to Jeju (CJU): about 1 h 15, with dozens of daily rotations (Korean Air, Asiana, Jeju Air, Air Busan, T'way, Jin Air) and variable fares, often around $35 to $70 one-way when booked in advance. Yeosu, Mokpo, and Busan also have flights to Jeju. A longer alternative is the ferry from Mokpo, Wando, or Yeosu.

From Jeju to Jeonju or Suncheon. There's no direct link. The fastest option is a flight from Jeju → Yeosu followed by the KTX Yeosu-Expo → Jeonju (about 1 h 20). Flying Jeju → Gwangju and then taking the bus is possible, but often more of a hassle.

Tips

  • Book KTX and SRT several weeks ahead for Friday evenings, Sunday evenings, and the days before holidays (Seollal, Chuseok).
  • For shorter distances (Seoul → Cheonan, Seoul → Chuncheon), compare the express bus and the Mugunghwa: both are often cheaper than the KTX.
  • At Incheon Airport, come prepared with a loaded T-money card or cash for the AREX — the Climate Card doesn't work there.
  • If you want a KORAIL Pass, book it through letskorail.com or a third-party reseller (Klook, Trazy) before you arrive; passes are for international tourists only.

Useful links

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