Face à face
| 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 |
| Europe - Matchs amicaux | 2017/08/09 16:57 | Real Sociedad B v Real Unión | L | 2-0 |
| Segunda B, Relegation Group 2 | 2017/01/21 18:00 | Real Unión v Real Sociedad B | D | 2-2 |
| Segunda B, Relegation Group 2 | 2016/09/04 16:00 | Real Sociedad B v Real Unión | D | 1-1 |
| Segunda B, Relegation Group 2 | 2016/02/13 15:00 | Real Unión v Real Sociedad B | W | 3-1 |
| Segunda B, Relegation Group 2 | 2015/09/26 14:30 | Real Sociedad B v Real Unión | W | 0-3 |
| Clubs internationaux - matchs amicaux | 2015/08/12 17:00 | Real Unión v Real Sociedad B | W | 3-0 |
Home History
| Europe - Matchs amicaux | 2018/08/03 17:03 | Tudelano v Real Unión | W | 2-3 |
| Europe - Matchs amicaux | 2018/08/01 18:02 | Real Unión v CD Vitoria | L | 1-2 |
| Europe - Matchs amicaux | 2018/07/25 17:00 | Real Unión v Real Sociedad | D | 1-1 |
| Europe - Matchs amicaux | 2018/07/18 18:02 | Real Unión v Osasuna | W | 1-0 |
| Segunda B, Relegation Group 2 | 2018/05/13 16:00 | Racing Santander v Real Unión | W | 0-2 |
| Segunda B, Relegation Group 2 | 2018/05/06 16:00 | Real Unión v Sporting Gijon B | D | 1-1 |
| Segunda B, Relegation Group 2 | 2018/04/28 16:00 | Mirandes v Real Unión | L | 1-0 |
| Segunda B, Relegation Group 2 | 2018/04/22 15:00 | Real Unión v Gernika | W | 5-4 |
Away History
| Europe - Matchs amicaux | 2018/08/11 17:00 | Barakaldo v Real Sociedad B | W | 8-9 |
| Europe - Matchs amicaux | 2018/08/04 17:00 | Gimnastica de Torrelavega v Real Sociedad B | W | 2-3 |
| Segunda B, Barrages d'accession | 2018/05/26 15:00 | Real Sociedad B v Fuenlabrada | D | 1-1 |
| Segunda B, Barrages d'accession | 2018/05/20 10:00 | Fuenlabrada v Real Sociedad B | D | 0-0 |
| Segunda B, Relegation Group 2 | 2018/05/13 16:00 | Pena Sport v Real Sociedad B | W | 1-3 |
| Segunda B, Relegation Group 2 | 2018/05/06 16:00 | Real Sociedad B v Racing Santander | W | 3-0 |
| Segunda B, Relegation Group 2 | 2018/04/29 09:30 | Sporting Gijon B v Real Sociedad B | W | 0-1 |
| Segunda B, Relegation Group 2 | 2018/04/21 14:00 | Real Sociedad B v Mirandes | L | 0-1 |