Head to Head
| Spain Segunda B Group 2 | 2021/03/28 10:00 | Real Unión v Athletic Bilbao B | L | 0-1 |
| Spain Segunda B Group 2 | 2021/01/10 17:00 | Athletic Bilbao B v Real Unión | D | 0-0 |
| Spain Segunda B Group 2 | 2020/03/07 15:00 | Athletic Bilbao B v Real Unión | D | 3-3 |
| Spain Segunda B Group 2 | 2019/10/19 14:00 | Real Unión v Athletic Bilbao B | L | 0-1 |
| Spain Segunda B Group 2 | 2019/05/12 16:00 | Athletic Bilbao B v Real Unión | L | 2-0 |
| Spain Segunda B Group 2 | 2018/12/22 15:30 | Real Unión v Athletic Bilbao B | W | 1-0 |
| Spain Segunda B Group 2 | 2018/01/20 15:00 | Real Unión v Athletic Bilbao B | W | 1-0 |
| Spain Segunda B Group 2 | 2017/09/02 14:00 | Athletic Bilbao B v Real Unión | L | 4-0 |
| Spain Segunda B Group 2 | 2017/04/02 09:30 | Athletic Bilbao B v Real Unión | W | 1-2 |
| Spain Segunda B Group 2 | 2016/11/05 15:00 | Real Unión v Athletic Bilbao B | W | 3-1 |
| Spain Segunda B Group 2 | 2015/03/14 15:00 | Athletic Bilbao B v Real Unión | W | 1-2 |
| Spain Segunda B Group 2 | 2014/10/26 16:00 | Real Unión v Athletic Bilbao B | D | 1-1 |