Head to Head
| Spain Primera Division RFEF Group 1 | 2021/11/07 11:00 | UD San Sebastian Reyes v Real Unión | W | 0-2 |
| Spain Segunda B Group 2 | 2017/05/07 16:00 | Real Unión v UD San Sebastian Reyes | D | 1-1 |
| Spain Segunda B Group 1 | 2016/12/11 11:00 | UD San Sebastian Reyes v Real Unión | L | 3-0 |