KTX vs. Intercity Bus for Long-Distance Travel in Korea
Quick comparison
| Option | Best for | Departs from (Seoul) | Relative speed | Worth knowing |
|---|---|---|---|---|
| KTX (high-speed rail) | Major city to major city, fastest option | Seoul Station or Suseo Station | Fastest | One unified network and fare since the Sep 1, 2026 KTX–SRT merger |
| Regional train (ITX-Saemaeul, Mugunghwa-ho) | Smaller towns KTX skips entirely | Varies by route | Slower than KTX, cheaper | Stops at many more stations than high-speed rail |
| Express bus (고속버스, gosok bus) | Major city to major city | Seoul Express Bus Terminal | Slower than KTX | Few or no stops; departs from dedicated terminals |
| Intercity bus (시외버스, sioe bus) | Smaller towns trains and express buses both skip | Varies by terminal | Slowest | Underneath cargo holds handle large suitcases more easily than trains |
SRT doesn't exist as a separate thing anymore
If you've read older guides (including an earlier version of this one), you've probably seen "KTX vs. SRT" framed as a real choice between two competing high-speed operators. That changed on September 1, 2026: Korea's antitrust regulator approved a merger between Korail (which ran KTX) and SR (which ran SRT), and SRT was folded into the unified KTX network — signage, booking, and fares included. If you're planning a Seoul-to-Busan-length trip today, the real choice is high-speed rail vs. regional trains vs. two different kinds of bus.
What the merger actually changed
- One booking system. Tickets for the unified KTX network are now sold through KORAIL+ — you no longer need a separate SR account or app for what used to be SRT-only routes.
- Fares moved toward the cheaper of the two. Former KTX routes had their fares cut by about 10% to match what used to be SRT's lower pricing, so you're not choosing between a "premium" and "budget" high-speed option anymore — it's one price.
- Suseo Station is still there. The old SRT home station in southeastern Seoul (near Gangnam) didn't close — high-speed trains now run from both Seoul Station and Suseo Station under the same KTX brand, so which one is more convenient still depends on where you're starting from in the city, even though it's no longer tied to a separate company.
- One loyalty program. Mileage now accrues at the same rate (about 5%) regardless of which station or route you're using.
The overlooked middle option: regional trains
High-speed rail isn't the only train option — Korail also runs slower, cheaper intercity services like ITX-Saemaeul and Mugunghwa-ho, which stop at many smaller stations that KTX skips entirely. If your destination is a smaller town rather than a major city, one of these regional trains, rather than a bus, might actually be the direct option — worth checking before assuming a bus is the only way to reach a place KTX doesn't serve.
The standing-ticket trick when trains sell out
During peak travel windows — especially the Seollal (Lunar New Year) and Chuseok (Korean Thanksgiving) holidays, when tens of millions of people travel domestically within a few days — reserved KTX seats can sell out within minutes of going on sale. Korail also sells standing (no assigned seat) tickets at a reduced price once regular seats are gone, worth knowing about if you're traveling during one of these windows and can tolerate standing for the journey.
Express bus vs. intercity bus — they're not the same thing
Korea has two separate categories of long-distance bus, and the terms aren't interchangeable. Express buses (often labeled 고속버스, "gosok bus") run between major cities on highways with few or no stops, departing from dedicated express bus terminals like Seoul's Express Bus Terminal. Intercity buses (시외버스, "sioe bus") make more stops and reach smaller towns that express routes and trains both skip. Premium buses with wider, more reclined seating are also available on many routes at a higher fare than standard buses. Buses cost less than high-speed rail and reach places trains don't, but take meaningfully longer on the same long-distance routes — worth it when the destination isn't near a KTX station, or when the schedule fits your plans better than shaving an hour off the trip matters. One underrated practical point in favor of buses: their underneath cargo holds handle large suitcases more easily than a train's overhead or end-of-car luggage racks.
Book ahead around Korean holidays
If any part of your trip overlaps with Seollal or Chuseok, book your train or bus as early as tickets go on sale — both often sell out within minutes for popular routes, and standing tickets or a different transport mode entirely may be your only options if you wait. Also worth knowing: natural events like typhoons and heavy snow can disrupt trains and flights with little warning during certain seasons, so building buffer time into your long-distance travel plans during summer/early fall or winter is a reasonable precaution.
The short version
- SRT merged into KTX on September 1, 2026 — one operator, one booking system (KORAIL+), one fare structure for what used to be two competing high-speed services
- Seoul Station and Suseo Station both still run high-speed trains; which is convenient depends on where you're starting from in Seoul
- Regional trains (ITX-Saemaeul, Mugunghwa-ho) reach smaller towns that high-speed rail skips
- Standing tickets exist on KTX when seats sell out — useful during holiday travel
- Express buses (major city to major city) and intercity buses (smaller towns) are different categories, not the same thing
- Book well ahead if your trip overlaps with Seollal or Chuseok
Official sources
This guide is checked against Korail. Prices, hours, and procedures change — confirm time-sensitive details there before you rely on them.
Frequently Asked Questions
Is SRT still a separate thing from KTX?
No — as of September 1, 2026, SR (which ran SRT) merged into Korail and SRT was absorbed into the unified KTX network. There's no longer a separate company, app, or fare structure to compare.
Do I still need a separate app to book what used to be SRT routes?
No — all high-speed rail bookings, including trains that used to run as SRT, now go through KORAIL+.
Does Suseo Station still exist?
Yes. Suseo Station, in southeastern Seoul, still runs high-speed trains under the unified KTX network — it just isn't tied to a separate company anymore. Seoul Station and Suseo Station remain the two main high-speed departure points in the city.
What if KTX tickets are sold out for my travel date?
Korail sells standing tickets at a reduced price once seats are gone, which is common during Seollal and Chuseok when demand spikes. It's also worth checking whether a regional train or a bus serves the same route.
When should I take an intercity bus instead of the train?
When your destination isn't near a KTX station, or the schedule matters more than saving an hour — buses cost less and reach smaller towns trains skip entirely. Just be clear on whether you need an express bus (major city to major city) or an intercity bus (smaller towns).
Are there cheaper train options than KTX?
Yes — Korail's regional services like ITX-Saemaeul and Mugunghwa-ho are slower but considerably cheaper, and they stop at many smaller stations that high-speed rail doesn't serve at all.