Question: how long ktx from seoul to busan?
Answer: KTX Trains from Seoul to Busan. KTX high-speed trains connect Seoul to Busan and is the most popular route in the country. You will reach Busan in less than 3 hours, the longest ride will take not more than 3 hours and 30 minutes. The train will use Gyeongbu line, and travel at around 305 km/h speed.