The 1988-89 Welsh Cup winners were Swansea City. The final was played at the Vetch Field in Swansea in front of an attendance of 5,100.
| Tie no | Home team | Score | Away team | |
|---|---|---|---|---|
| 1 | Barry Town | 0–1 | Swansea City | |
| 2 | Kidderminster Harriers | 1–0 | Hereford United |
| Tie no | Home team | Score | Away team | |
|---|---|---|---|---|
| 1 | Swansea City | 2–1 | Barry Town | |
| 2 | Hereford United | 0–0 | Kidderminster Harriers |