KTX vs Express Bus vs Domestic Flights in Korea: How to Choose and Book (2026)
Short answer: For most city-to-city trips on the Korean mainland, the train (KTX or SRT) is the simplest option because stations are in city centers and you can book in English. Express or intercity buses reach more destinations, including smaller towns. Domestic flights make the most sense for Jeju Island. The official pages do not publish one table of travel times or fares, so check the booking site for your exact route and date.
This guide explains how each option works and how a visitor books it, using the Korea Tourism Organization’s VisitKorea pages and the operators’ own pages. Fares and timetables change often, so none are quoted here.
The three options at a glance
| Train (KTX / SRT) | Express / intercity bus | Domestic flight | |
|---|---|---|---|
| Best for | Major cities on the main rail lines | Towns the rail network does not serve well | Jeju Island and long distances |
| Where you board | Train stations | Bus terminals | Airports |
| English booking | Yes, on the Korail website | Yes, on several bus sites | Through each airline’s own site |
| Foreign-visitor pass | KORAIL Pass (international travelers only) | No pass listed on the official page | No pass listed on the official page |
| Fares and times on the official page | Not listed | Not listed | Not listed |
Trains: KTX, SRT and the rest
According to VisitKorea (page last updated August 7, 2026), Korea has several train types:
- KTX runs at up to 330 km/h and leaves from Seoul, Yongsan and Cheongnyangni stations. Destinations include Busan, Pohang, Mokpo, Yeosu, Gangneung and Andong.
- SRT runs at up to 300 km/h from Suseo Station toward Busan or Mokpo. It is run by a separate company, SR.
- Saemaeul / ITX and Mugunghwa are conventional trains. Mugunghwa stops at small stations that KTX and premium trains skip.
- Tourist trains are themed routes.
The main line between Seoul and Busan is the Gyeongbu Line, which VisitKorea gives as 447.1 km. It has the most passengers of any route in the country.
How to book a train
VisitKorea lists these ways to buy tickets: a ticket office, the KORAIL website, the KORAIL+ app, station kiosks, NAVER Train Booking, or KakaoT. It states that sales open one month before departure at 07:00 and close 20 minutes before departure, and that app purchases can be made closer to departure. Online buyers can choose a seat. The Korail booking website is listed in Korean, English, Chinese and Japanese and covers KTX, SRT, conventional and tourist trains. The KORAIL customer center line, +82-1599-7777, is described as English-only and open daily 08:00 to 20:00.
SRT tickets are sold through SR’s own system. SR’s English pages include a “My Ticket” section for managing a booking, and its customer center lists an English automated phone service (press 7). SR’s customer center number is 1800-1472, open 9 AM to 6 PM.
The KORAIL Pass for foreign visitors
VisitKorea describes the KORAIL Pass as a pass “exclusively for international travelers.” As described there:
- It comes as a 2-, 3-, 4- or 5-day flexible pass, usable within ten days.
- It includes unlimited standard-cabin travel, up to two seat reservations per day, and unlimited standing tickets.
- First-class seats can be booked for 50% of the regular first-class fare.
- It does not cover SRT, subways or temporary tourist trains.
This guide could not read a current price list on an official page, so no pass prices are given here. Whether a pass saves money depends on how many long trips you plan, so compare the pass price on the Korail site with the individual fares for your route.
Express and intercity buses
VisitKorea (page last updated June 5, 2026) separates two bus types:
- Express buses use expressways only and do not stop in cities along the way. Fares depend on seat comfort level (standard or premium), and late-night surcharges apply.
- Intercity buses use expressways and national highways, stop at intermediate cities, and reach more destinations, including smaller regional cities. They come in standard and luxury classes.
Booking sites listed on that page:
| Service | Website | Languages (per VisitKorea) |
|---|---|---|
| Express buses | kobus.co.kr | Korean, English, Japanese, Chinese |
| Intercity buses | txbus.t-money.co.kr | Korean, English, Japanese, Chinese |
| Intercity buses | bustago.or.kr | Korean, English, Japanese, Chinese |
The page notes that regional restrictions may affect access to some sites from certain countries. It also lists Klook and Hanpass as English-language booking platforms. Depending on destination and booking method, you may need to print your ticket at the departure terminal before boarding. Payment at the terminal can be cash, credit card or mobile pay. The page says you can typically board 5 to 10 minutes before departure, and that buses have no onboard restrooms but make scheduled stops at highway rest areas.
Seoul has several terminals, and some are far apart. Express and intercity buses to the same destination may leave from different terminals, so confirm yours before you set out.
Domestic flights
VisitKorea (page last updated June 19, 2026) says domestic routes are flown by Korean Air, Asiana Airlines (described as “to be merged with Korean Air”), Jeju Air, Jin Air, Air Busan, Air Seoul, Trinity Airways, Eastar Jet, Aero K, SUM Air and Parata Air. It states that the Gimpo-Jeju section is so popular it “has been selected as the busiest route in the entire world.”
Seoul’s domestic flights mostly use Gimpo Airport, which VisitKorea says connects to Jeju, Gimhae (Busan), Ulsan, Yeosu, Sacheon, Pohang/Gyeongju and Gwangju. Jeju Airport serves many cities, including Incheon, Gimpo, Gimhae and Daegu. VisitKorea says it does not sell tickets, and points travelers to the airlines’ own websites and to the Korea Airports Corporation (airport.co.kr). It adds that routes can change, and that Muan Airport is listed as closed until December 24, 2026.
At Gimpo, the Korea Airports Corporation describes domestic self check-in at a kiosk: pick your airline, enter your reservation number or scan the QR code, choose a seat, then drop your luggage at the airline counter. The page gives no check-in cutoff times or ID rules, so confirm those with your airline.
During major holidays
VisitKorea’s Chuseok guide says train and express bus tickets sell out quickly during major holidays, advises checking when advance booking opens for each service, and suggests a backup plan such as a rental car. Chuseok and Seollal follow the lunar calendar, so their dates shift each year.
Quick checklist
- Is my destination on a rail line, or do I need a bus terminal or airport?
- Have checked the current fare and timetable on the operator’s own site?
- If I want the KORAIL Pass, have I compared its price with single tickets for my planned trips?
- Do I know which station, terminal or airport I leave from, and how to get there?
- Is my trip near a major holiday? Book early.
Common mistakes
- Assuming the KORAIL Pass works on SRT. The official page says it does not.
- Going to the wrong Seoul bus terminal.
- Forgetting that some bus bookings must be printed at the terminal.
- Relying on old fares or schedules from blogs instead of the operator’s site.
This guide is general information, not personal advice. Confirm current fares, schedules and booking rules with the operator before you travel.
Sources
- VisitKorea (Korea Tourism Organization): Train
- VisitKorea: Express Bus & Intercity Bus
- VisitKorea: Domestic Flights
- Korea Airports Corporation (Gimpo Airport): Domestic fast check-in
- SR (SRT) Customer Center
- VisitKorea: 2026 Chuseok Holiday Travel Guide
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