Question: how much ktx from seoul to busan?
Answer: The simplest and most direct method is to buy a one-way ticket (round trip is not available). Fares vary depending on your destination. A short jaunt from Seoul Station to Suwon will run about 13,000 won (~$11) and the popular ride to Busan will cost you about 56,000 won (~$51) for an economy class seat.