Face à face
| 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 | W | 1-0 |
| Segunda B, Relegation Group 2 | 2019/02/24 17:00 | Real Sociedad B v Real Unión | W | 2-1 |
| Segunda B, Relegation Group 2 | 2018/10/07 15:00 | Real Unión v Real Sociedad B | L | 2-1 |
| Europe - Matchs amicaux | 2018/08/18 09:33 | Real Unión v Real Sociedad B | W | 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 | W | 2-0 |
| Europe - Matchs amicaux | 2017/08/09 16:57 | Real Sociedad B v Real Unión | W | 2-0 |
Home History
| Segunda B, Relegation Group 2 | 2020/11/14 15:30 | Amorebieta v Real Sociedad B | L | 2-1 |
| Segunda B, Relegation Group 2 | 2020/11/08 16:00 | Barakaldo v Real Sociedad B | W | 1-4 |
| Segunda B, Relegation Group 2 | 2020/11/01 17:30 | Real Sociedad B v Laredo | W | 3-0 |
| Segunda B, Relegation Group 2 | 2020/10/18 15:00 | Real Sociedad B v Leioa | W | 1-0 |
| Segunda B, Relegation Group 2 | 2020/03/08 16:00 | Real Sociedad B v Haro Deportivo | D | 1-1 |
| Segunda B, Relegation Group 2 | 2020/03/01 11:00 | Deportivo Alaves B v Real Sociedad B | L | 3-2 |
| Segunda B, Relegation Group 2 | 2020/02/23 17:00 | Real Sociedad B v Valladolid B | D | 1-1 |
| Segunda B, Relegation Group 2 | 2020/02/16 17:30 | Real Sociedad B v Barakaldo | L | 2-4 |
Away History
| Segunda B, Relegation Group 2 | 2020/11/18 16:00 | Real Unión v Deportivo Alaves B | L | 1-2 |
| Segunda B, Relegation Group 2 | 2020/11/15 16:00 | Real Unión v Barakaldo | W | 2-1 |
| Segunda B, Relegation Group 2 | 2020/11/08 17:00 | Laredo v Real Unión | L | 1-0 |
| Segunda B, Relegation Group 2 | 2020/10/25 16:00 | Leioa v Real Unión | W | 0-1 |
| Segunda B, Relegation Group 2 | 2020/03/07 15:00 | Athletic Bilbao B v Real Unión | D | 3-3 |
| Segunda B, Relegation Group 2 | 2020/02/29 15:15 | Valladolid B v Real Unión | L | 1-0 |
| Segunda B, Relegation Group 2 | 2020/02/23 16:00 | Real Unión v Amorebieta | L | 0-1 |
| Segunda B, Relegation Group 2 | 2020/02/15 15:00 | Arenas Club de Getxo v Real Unión | D | 0-0 |
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