The Bundang Line was first opened in September 1994 between Suseo and Ori. It was extended from Suseo to Seolleung in September 2003. On November 26, 2004, a temporary terminal station named Bojeong was opened near the Bundang Line Train Depot, and on December 24, 2007, Jukjeon Station was opened between Ori and Bojeong Stations. On December 28, 2011, a new Bojeong station, as well as Guseong, Singal, and Giheung stations were opened. On October 6, 2012, the line was extended to Wangsimni Station and on December 1, 2012 to Mangpo Station. On November 30, 2013, the final extension to Suwon Station was opened, allowing connections to Line 1, and express service was launched. The Suin Line, which will see through service through the Bundang Line, is slated to open in December 2016, which will create a long line from Wangsimni Station to Incheon Station.
Trains run every 4~5 minutes during rush hours & every 7~8 minutes during off peak hours between Wangsimni and Jukjeon. Trains run at half the frequency between Jukjeon and Suwon, except during rush hours.
All northbound trains terminate at Wangsimni, except during night time where they terminate at Jukjeon. Half of the southbound services head to Suwon, and another half head Jukjeon. Express train service stop at all stops between Wangsimni and Jukjeon, and thereafter at Giheung, Mangpo, Suwon City Hall and Suwon. The express service only operates during rush hours on weekdays.
The Bundang Line uses Korail Class 351000 trains. The rolling stock is the same class used on Line 4 because they were all originally classified as Class 2000 trains. First generation trains (trainsets 351-01~351-22) were introduced since the line's opening, second generation trains (trainsets 351-23~351-28) were introduced when the Bundang Line was extended from Suseo to Seolleung in 2003, and third generation trains (351-29~351-60) are currently being introduced as more extensions open; trainsets 351-29~351-43 have been delivered and are on property, and all are currently in service. Trainsets 351-44~351-60 are expected to be delivered when the rest of the Suin Line opens.