The KTX train from Seoul to Asan departs from Seoul Station as early as 5:30 AM, with the last train leaving around 8:00 PM. Key stops include Suwon and Cheonan. This high-speed train, known as KTX, covers the journey in approximately 1 hour. Tickets start at ₩15,000 (around $10 USD) for standard class, with First Class options available for a more spacious experience. You can reserve a seat and check the schedule through online booking, providing flexibility for your ideal travel time.