For a rail trip to central Sejong, the useful gateway is often Osong Station rather than a station named for Sejong. Sejong City Transportation Corporation’s current B2 page lists the route as Osong Station → Government Complex → Banseok → Daejeon World Cup Stadium. The route was reworked in October 2025: B2 was extended and B6 was abolished and folded into the new pattern.
That makes B2 especially useful for travelers heading to Government Complex Sejong, the central BRT corridor, or connecting onward to the Daejeon side. The current operator page lists frequent service, with weekday intervals as short as several minutes during parts of the day, but the exact timetable varies by weekday/holiday and traffic.
Do not plan a tight last connection from a late KTX/SRT arrival without checking the current timetable. Also note that BRT boarding/payment rules differ from ordinary buses; the operator’s fare page states that cash boarding on major BRT routes has been restricted, so arriving with a compatible transit card is the safest plan. If your hotel or attraction is off the BRT spine, plan a second local-bus or taxi leg.