Head to Head
| 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 |
Home History
| Europe Friendlies | 2019/08/17 09:00 | Amorebieta v Real Unión | L | 3-2 |
| Europe Friendlies | 2019/08/16 17:00 | Real Unión v Lagun Onak | D | 1-1 |
| Europe Friendlies | 2019/08/03 09:30 | Real Sociedad B v Real Unión | L | 1-0 |
| Europe Friendlies | 2019/07/27 08:53 | Real Unión v CD Vitoria | W | 1-0 |
| Spain Segunda B Play-Offs | 2019/06/02 16:30 | Real Unión v Jumilla | W | 2-0 |
| Spain Segunda B Play-Offs | 2019/05/26 16:00 | Jumilla v Real Unión | D | 2-2 |
| Spain Segunda B Group 2 | 2019/05/19 16:00 | Real Unión v Tudelano | W | 1-0 |
| Spain Segunda B Group 2 | 2019/05/12 16:00 | Athletic Bilbao B v Real Unión | L | 2-0 |
Away History
| Europe Friendlies | 2019/08/17 17:00 | Barakaldo v Athletic Bilbao B | L | 2-0 |
| Europe Friendlies | 2019/08/14 17:00 | Leioa v Athletic Bilbao B | D | 2-2 |
| Europe Friendlies | 2019/08/07 17:25 | Numancia v Athletic Bilbao B | D | 2-2 |
| Europe Friendlies | 2019/07/30 09:01 | Athletic Bilbao B v Arenas Club de Getxo | D | 1-1 |
| Europe Friendlies | 2019/07/26 15:53 | Athletic Bilbao B v Amorebieta | W | 4-2 |
| Spain Segunda B Group 2 | 2019/05/19 16:00 | CD Vitoria v Athletic Bilbao B | D | 0-0 |
| Spain Segunda B Group 2 | 2019/05/12 16:00 | Athletic Bilbao B v Real Unión | W | 2-0 |
| Spain Segunda B Group 2 | 2019/05/05 16:00 | CD Calahorra v Athletic Bilbao B | W | 0-3 |