Seoul to Busan in 2026: KTX Train, Express Bus or Flight

Seoul to Busan is the busiest intercity trip in Korea, and for most visitors the answer is short: take the KTX. The fastest trains do it in about two hours and twenty minutes, centre to centre, and since the September 2026 fare cut a standard seat costs about 54,400 won. The express bus costs half as much and takes twice as long. Flying rarely wins once you count the airports. Here’s what each option costs in 2026, what changed when KTX and SRT merged, how to book with a foreign card, and what to do when the trains sell out.

Seoul to Busan: train, bus or flight?

The KTX from Seoul to Busan

Most KTX trains to Busan start at Seoul Station, in the city centre, on subway Lines 1 and 4 and the AREX airport line. The fastest ones stop only a few times and take about two hours and twenty minutes. Slower services add stations such as Cheonan-Asan, Gimcheon-Gumi or Gyeongju and take closer to three. Trains run from a little after 5 am to about 10:30 pm, several an hour at busy times, and the KTX Seoul to Busan timetable works just as well in reverse: Busan to Seoul is the same fare and the same choice of trains.

The September 2026 fare cut took the standard Seoul to Busan fare from 59,800 won to about 54,400. First class costs roughly 40 percent more, with wider seats in a 2+1 layout, and we don’t think it’s worth it for a trip this short. Children aged 6 to 12 pay half. You’ll see three names on the departure board, KTX, KTX-Sancheon and the newer KTX-Cheongryong; all three are high-speed trains, and the fare is the same.

What changed when KTX and SRT merged

Until August 2026, two companies ran high-speed trains to Busan: Korail’s KTX from Seoul Station, and SR’s SRT from Suseo in Gangnam, with its own app and slightly lower fares. Korail took over SR, and the two have run as one network since 1 September 2026. KTX fares came down by about 10 percent on average to the old SRT level, the SRT app and website closed on 31 August, and every high-speed ticket is now sold through Korail+ (the app that replaced Korail Talk in August) and the Let’s Korail website.

Suseo is still its own station, on subway Line 3 and the Suin-Bundang line, so check which Seoul station is printed on your ticket. If your hotel is in Gangnam, a Suseo departure saves you the trip across the river to Seoul Station.

How to book KTX tickets as a foreigner

Since 1 October 2026, KTX tickets go on sale 60 days before departure instead of 30. Book on letskorail.com or in the Korail+ app with your passport details; both take Visa, Mastercard and UnionPay. The app sometimes rejects foreign cards at the 3-D Secure step, and when that happens the website on a laptop usually goes through. Any station ticket office will also sell you a seat if you show your passport, which is fine on a Tuesday morning and a gamble on a Friday evening.

Your ticket is a QR code on your phone, and your T-money card won’t get you on the train. Cancelling is almost free until two days before departure; after that the fee climbs in steps as the train gets closer, and since May 2025 it has been higher on weekends and public holidays. If the train you want is full, look again the evening before. Seats come back as people cancel.

Is the Korea Rail Pass worth it for Seoul to Busan?

Usually not. The KORAIL Pass is sold to foreign passport holders only, and the 2-day version costs about 131,000 won, more than a standard Seoul to Busan return at about 108,800. It starts to pay off only when you add more high-speed legs, such as a side trip to Gyeongju or onward to Jeonju. It includes two seat reservations a day and can’t be used around Seollal and Chuseok. We couldn’t confirm whether it now covers the former SRT trains from Suseo, so plan pass journeys from Seoul Station.

Slower trains: ITX-Saemaeul and Mugunghwa

The old Gyeongbu line still carries conventional trains between the two cities. ITX-Saemaeul takes about four and a half hours and costs around 42,600 won. Mugunghwa takes five and a half to six hours for about 28,600 won. They’re the cheapest Seoul to Busan train, and the fallback we’d look at first when every KTX on our date is gone.

Seoul to Busan by bus

Express buses to Busan leave Seoul Express Bus Terminal, on subway Lines 3, 7 and 9, about every half hour, and some also run from Dong Seoul. The ride takes four to four and a half hours with one rest stop, and longer on Friday evenings and holiday weekends. Most buses end at Busan’s main bus terminal at Nopo, at the northern end of subway Line 1; some go to Haeundae or Sasang instead.

Before 1 October 2026, a regular seat cost roughly 26,000 to 29,000 won, deluxe about 36,000 to 40,000, and premium, with three wide seats per row, about 48,000 to 53,000. The government raised the ceiling on express-bus fares by up to 9 percent from that date, so expect to pay a little more. Book on kobus.co.kr, which accepts foreign cards more reliably than the bus apps. Every seat is reserved.

Seoul to Busan flights

Gimpo to Gimhae is about an hour and five minutes in the air, with Korean Air, Air Busan, Jin Air, Jeju Air, T’way and Eastar Jet on the route. Korean Air advertises fares from 68,900 won, and the low-cost airlines often sell seats for around 50,000. Add the subway to Gimpo, check-in and the ride into Busan, and a Seoul to Busan flight takes three hours or more, longer than the KTX. It makes sense if you’re staying near Gimpo or the trains are sold out.

From Gimhae Airport, the Busan-Gimhae Light Rail connects to subway Line 2 at Sasang and Line 3 at Daejeo, and limousine buses run to Seomyeon for 7,500 won and to Haeundae for 9,500.

Arriving at Busan Station

Busan Station is in Dong-gu, across the road from Busan’s Chinatown, and on subway Line 1. Haeundae is about an hour away by subway, changing to Line 2 at Seomyeon, or 30 to 40 minutes by taxi outside rush hour. Your T-money card works on Busan’s subway and buses; Seoul’s Climate Card doesn’t. Keep your Korea eSIM topped up, because Kakao T is the easiest way to get a taxi at the station.

Still at the airport? Start with our guide to getting from Incheon Airport to Seoul, then read up on money in Korea and whether you need a K-ETA before you fly.

Looking for the rest? Every Korea guide we’ve published, from the K-ETA to the T-money card, is sorted by topic in our South Korea travel guide.

Going on to Jeju? Our Seoul to Jeju guide covers the flights from Gimpo and from Busan’s Gimhae Airport, and why there’s no ferry from Busan.

Finding your way around Busan? Our Naver Map English guide covers the app, and Kakao Metro handles the subway.

Taking the Seoul subway on the way? Our Korean etiquette guide explains priority and pink seats, and which side of the escalator to stand on.

Heading on to Gyeongju? Our Seoul to Gyeongju guide covers the KTX to Gyeongju Station, the express bus and whether a day trip works, and has a short Busan to Gyeongju section for the way back down the line.

Heading southwest instead? Our Seoul to Jeonju guide covers the KTX from Yongsan, the express bus, and how to reach the Hanok Village.

Data checked: 2026-10-06