Booking KTX as a foreigner is straightforward, with one catch: foreign cards sometimes get rejected on the official app. The KTX is the fastest way between Korea's big cities, running Seoul to Busan in about 2 hours 40 minutes with 70-plus trains a day. You have three ways to buy tickets. Here's each one and when to reach for it.
1. Korail app (Korail Talk): the official option
- Full English interface. Search by date and choose your exact seat.
- Takes international Visa and Mastercard.
- Emails a QR e-ticket that works at the gates without printing.
- Booking opens about a month before departure.
This is usually the cheapest option at face value, and it's the one we start with. The catch is that some foreign cards trip a verification error at checkout. If yours does, drop to one of the options below.
2. KKday: the reliable fallback
KKday sells KTX tickets through an English checkout that handles international cards well, and it sometimes runs small discounts or bundles like a city tour paired with the train. Your e-ticket lands in your KKday account. When the Korail app rejects your card, this is the quickest workaround.
3. Station kiosks and counters: no app needed
Every major station (Seoul, Busan and the rest) has kiosks with an English mode plus staffed ticket windows, and you can pay by card or cash. Boarding is relaxed. No airport-style security, no ticket inspection at the gate. You just find your platform, car and seat. Good if you'd rather sort tickets once you arrive.
Traveling a lot? Consider the KR Pass
The KR Pass (Korail Pass) is sold only to foreign visitors and gives unlimited rides for a set number of days. A flexible 2-day pass starts at roughly $88, as of 2026 (check the current fare). If you're stringing together several intercity trips, say Seoul, Gyeongju and Busan, it can undercut buying single tickets.
Quick rules of thumb
- Book early for weekends and Korean public holidays. Popular trains do sell out.
- If a foreign card bounces on the official app, switch to KKday or the station counter.
- Keep your QR e-ticket on your phone. There's no separate check-in.
- Doing 3-plus train trips? Price the KR Pass before you buy individual tickets.