Face à face
| Segunda B, Relegation Group 2 | 2020/11/22 11:00 | Real Sociedad B v Real Unión | W | 0-1 |
| Segunda B, Relegation Group 2 | 2019/12/15 16:00 | Real Unión v Real Sociedad B | D | 2-2 |
| Europe - Matchs amicaux | 2019/08/03 09:30 | Real Sociedad B v Real Unión | L | 1-0 |
| Segunda B, Relegation Group 2 | 2019/02/24 17:00 | Real Sociedad B v Real Unión | L | 2-1 |
| Segunda B, Relegation Group 2 | 2018/10/07 15:00 | Real Unión v Real Sociedad B | W | 2-1 |
| Europe - Matchs amicaux | 2018/08/18 09:33 | Real Unión v Real Sociedad B | L | 0-3 |
| Segunda B, Relegation Group 2 | 2018/03/29 10:00 | Real Unión v Real Sociedad B | D | 0-0 |
| Segunda B, Relegation Group 2 | 2017/11/04 15:00 | Real Sociedad B v Real Unión | L | 2-0 |
Home History
| Segunda B, Relegation Group 2 | 2021/02/13 17:00 | Barakaldo v Real Unión | L | 3-0 |
| Segunda B, Relegation Group 2 | 2021/02/07 16:00 | Real Unión v Laredo | W | 4-1 |
| Segunda B, Relegation Group 2 | 2021/01/24 16:00 | Real Unión v Leioa | W | 5-0 |
| Segunda B, Relegation Group 2 | 2021/01/16 15:00 | Deportivo Alaves B v Real Unión | W | 0-1 |
| Segunda B, Relegation Group 2 | 2021/01/13 18:00 | Racing Santander v Real Unión | W | 1-3 |
| Segunda B, Relegation Group 2 | 2021/01/10 17:00 | Athletic Bilbao B v Real Unión | D | 0-0 |
| Segunda B, Relegation Group 2 | 2020/12/20 16:00 | Real Unión v Portugalete | W | 2-1 |
| Segunda B, Relegation Group 2 | 2020/12/05 14:45 | Real Unión v Arenas Club de Getxo | D | 1-1 |
Away History
| Segunda B, Relegation Group 2 | 2021/02/13 14:45 | Real Sociedad B v Amorebieta | W | 2-1 |
| Segunda B, Relegation Group 2 | 2021/02/07 17:30 | Real Sociedad B v Barakaldo | W | 2-0 |
| Segunda B, Relegation Group 2 | 2021/01/31 11:00 | Laredo v Real Sociedad B | D | 0-0 |
| Segunda B, Relegation Group 2 | 2021/01/16 14:45 | Leioa v Real Sociedad B | D | 1-1 |
| Segunda B, Relegation Group 2 | 2021/01/09 15:00 | Deportivo Alaves B v Real Sociedad B | W | 0-1 |
| Segunda B, Relegation Group 2 | 2021/01/03 15:30 | Real Sociedad B v Racing Santander | W | 4-1 |
| Segunda B, Relegation Group 2 | 2020/12/19 14:45 | Real Sociedad B v Athletic Bilbao B | L | 1-2 |
| Segunda B, Relegation Group 2 | 2020/12/12 16:00 | Portugalete v Real Sociedad B | D | 1-1 |
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