Rapid transit systems operate in six major South Korean cities, except for Sejong.
| Rapid transit systems | |||||||
|---|---|---|---|---|---|---|---|
| System | Locale | Lines | Stations | Length (km) | Commencement | ||
| Seoul Subway (inc. Incheon Subway) | Seoul Capital Area | 24 | 777 | 1,386.4 | 15 August 1974 | ||
| Busan Metro | Busan–Gyeongnam Area | 6 | 158 | 205.6 | 19 July 1985 | ||
| Daegu Metro | Daegu–Gyeongbuk Area | 4 | 101 | 153.7 | 26 November 1997 | ||
| Gwangju Metro | Gwangju | 1 | 20 | 20.6 | 28 April 2004 | ||
| Daejeon Metro | Daejeon | 1 | 22 | 22.7 | 16 March 2006 | ||
| Rapid transit lines in Busan | ||||||
|---|---|---|---|---|---|---|
| Operator | Livery | Line | Stations | Length (km) | Terminuses | Commencement |
| Busan Transportation Corp. | | Busan Metro Line 1 | 40 | 40.5 | Dadaepo Beach–Nopo | 19 July 1985 |
| | Busan Metro Line 2 | 42 | 45.2 | Jangsan–Yangsan | 30 June 1999 | |
| | Busan Metro Line 3 | 17 | 18.3 | Suyeong–Daejeo | 28 November 2005 | |
| | Busan Metro Line 4 | 14 | 12.7 | Minam–Anpyeong | 30 March 2011 | |
| B&G Metro | | Busan–Gimhae Light Rail Transit | 21 | 23.4 | Sasang–Kaya University | 9 September 2011 |
| Korail | | Donghae Line | 23 | 65.7 | Bujeon–Taehwagang | 30 December 2016 |
| Rapid transit lines in Daegu | ||||||
|---|---|---|---|---|---|---|
| Operator | Livery | Line | Stations | Length (km) | Terminuses | Commencement |
| Daegu Metropolitan Transit | | Daegu Metro Line 1 | 35 | 37.3 | Seolhwa-Myeonggok–Ansim | 26 November 1997 |
| | Daegu Metro Line 2 | 29 | 31.4 | Munyang–Yeungnam University | 18 October 2005 | |
| | Daegu Metro Line 3 | 30 | 23.9 | KNU Medical Center–Yongji | 23 April 2015 | |
| Korail | Daegyeong Line | 7 | 61.9 | Gumi–Gyeongsan | 14 December 2024 | |
| Rapid transit lines in Daejeon | ||||||
|---|---|---|---|---|---|---|
| Operator | Livery | Line | Stations | Length (km) | Terminuses | Commencement |
| Daejeon Metropolitan Express Transit | | Daejeon Metro Line 1 | 22 | 22.7 | Panam–Banseok | 16 March 2006 |
| Rapid transit lines in Gwangju | ||||||
|---|---|---|---|---|---|---|
| Operator | Livery | Line | Stations | Length (km) | Terminuses | Commencement |
| Gwangju Metropolitan Rapid Transit | | Gwangju Metro Line 1 | 20 | 20.6 | Nokdong–Pyeongdong | 28 April 2004 |