P: 21 W: 7 D: 5 L: 9
Previously: Swansea City Reserves; Swansea City U21
Last meeting: 30 Mar 1998 — Llanelli v Swansea City (2-3)
| Season | Date | Match | Result | Score | Competition |
|---|---|---|---|---|---|
| 1974-75 | 26 Dec 1974 | Llanelli v Swansea City Reserves | D | 2-2 | LEAGUE |
| 1974-75 | 03 May 1975 | Swansea City Reserves v Llanelli | W | 2-1 | LEAGUE |
| 1975-76 | Swansea City Reserves v Llanelli | L | 0-9 | LEAGUE | |
| 1975-76 | 26 Dec 1975 | Llanelli v Swansea City Reserves | D | 2-2 | LEAGUE |
| 1976-77 | Llanelli v Swansea City | W | 2-0 | WWSC F | |
| 1976-77 | 26 Dec 1976 | Llanelli v Swansea City Reserves | W | 1-0 | LEAGUE |
| 1976-77 | 09 Feb 1977 | Swansea City Reserves v Llanelli | L | 0-2 | LEAGUE |
| 1978-79 | Swansea City Reserves v Llanelli | D | 1-1 | LEAGUE | |
| 1978-79 | 26 Dec 1978 | Llanelli v Swansea City Reserves | W | 3-2 | LEAGUE |
| 1979-80 | Swansea City Reserves v Llanelli | D | 2-2 | LEAGUE | |
| 1979-80 | 26 Dec 1979 | Llanelli v Swansea City Reserves | W | 2-1 | LEAGUE |
| 1980-81 | 13 Dec 1980 | Llanelli v Swansea City | W | 1-0 | SA BRAINS CUP 3R |
| 1980-81 | 26 Dec 1980 | Llanelli v Swansea City Reserves | W | 2-1 | LEAGUE |
| 1980-81 | 20 Jan 1981 | Swansea City Reserves v Llanelli | D | 0-0 | LEAGUE |
| 1982-83 | 23 Jan 1983 | Llanelli v Swansea City | L | 1-2 | WEST WALES SENIOR CUP |
| 1983-84 | 22 Mar 1984 | Swansea City v Llanelli | L | 2-3 | WWSCSF |
| 1989-90 | 01 May 1990 | Swansea City v Llanelli | L | 1-3 | WWSC F |
| 1990-91 | 30 Oct 1990 | Swansea City v Llanelli | L | 1-8 | WELSH CUP 3R |
| 1990-91 | 30 Apr 1991 | Swansea City v Llanelli | L | 0-3 | WWSC F |
| 1993-94 | 21 Apr 1994 | Llanelli v Swansea City | L | 0-1 | WWSC SF |
| 1997-98 | 30 Mar 1998 | Llanelli v Swansea City | L | 2-3 | WWSC SF |