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 |
Home History
| Europe Friendlies | 2021/07/31 17:01 | Real Unión v Racing Santander | D | 2-2 |
| Spain Segunda B Group 2 | 2021/05/16 10:00 | CD Ebro v Real Unión | L | 1-0 |
| Spain Segunda B Group 2 | 2021/05/09 16:00 | Real Unión v Osasuna B | L | 0-1 |
| Spain Segunda B Group 2 | 2021/05/02 10:00 | SD Tarazona v Real Unión | W | 1-2 |
| Spain Segunda B Group 2 | 2021/04/18 16:00 | Real Unión v CD Ebro | W | 3-0 |
| Spain Segunda B Group 2 | 2021/04/10 15:00 | Osasuna B v Real Unión | W | 0-2 |
| Spain Segunda B Group 2 | 2021/04/07 16:00 | Real Unión v SD Tarazona | W | 1-0 |
| Spain Segunda B Group 2 | 2021/03/28 10:00 | Real Unión v Athletic Bilbao B | L | 0-1 |
Away History
| Europe Friendlies | 2021/07/31 10:30 | Sporting Gijon B v Athletic Bilbao B | D | 2-2 |
| Europe Friendlies | 2021/07/24 09:30 | Athletic Bilbao B v Mirandes | L | 0-1 |
| Spain Segunda B Play-Offs | 2021/05/23 18:00 | Burgos v Athletic Bilbao B | L | 1-0 |
| Spain Segunda B Play-Offs | 2021/05/16 18:15 | Athletic Bilbao B v Celta Fortuna | W | 2-1 |
| Spain Segunda B Group 2 | 2021/05/09 10:00 | SD Logrones v Athletic Bilbao B | L | 1-0 |
| Spain Segunda B Group 2 | 2021/05/01 15:00 | Athletic Bilbao B v Tudelano | W | 3-1 |
| Spain Segunda B Group 2 | 2021/04/25 15:00 | CD Calahorra v Athletic Bilbao B | L | 2-1 |
| Spain Segunda B Group 2 | 2021/04/17 13:45 | Athletic Bilbao B v SD Logrones | W | 2-0 |