| 2. Round | 01/09/2018 | Real Sociedad B | - | SCD Durango | 3:0 | ||||
| 3. Round | 09/09/2018 | Barakaldo CF | - | Real Sociedad B | 2:0 | ||||
| 8. Round | 13/10/2018 | Real Sociedad B | - | Athletic Club B | 1:0 | ||||
| 13. Round | 17/11/2018 | SD Gernika | - | Real Sociedad B | 1:0 | ||||
| 16. Round | 09/12/2018 | Real Sociedad B | - | CD Vitoria | 4:2 | ||||
| 17. Round | 16/12/2018 | Real Sociedad B | - | CD Mirandés | 0:1 | ||||
| 19. Round | 06/01/2019 | Real Sociedad B | - | CD Izarra | 3:0 | ||||
| 20. Round | 12/01/2019 | Real Sociedad B | - | Racing Santander | 0:1 |  |
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| 21. Round | 19/01/2019 | SCD Durango | - | Real Sociedad B | 1:3 | ||||
| 22. Round | 26/01/2019 | Real Sociedad B | - | Barakaldo CF | 3:0 | ||||
| 23. Round | 03/02/2019 | UP Langreo | - | Real Sociedad B | 1:0 | ||||
| 24. Round | 09/02/2019 | Real Sociedad B | - | Sporting Gijón B | 3:1 | ||||
| 25. Round | 17/02/2019 | CD Calahorra | - | Real Sociedad B | 0:1 | ||||
| 26. Round | 24/02/2019 | Real Sociedad B | - | Real Unión | 2:1 | ||||
| 27. Round | 02/03/2019 | Athletic Club B | - | Real Sociedad B | 2:2 |
Spain