| 2. Round | 26/08/2017 | Real Sociedad B | - | Athletic Club B | 0:3 | ||||
| 5. Round | 16/09/2017 | SD Amorebieta | - | Real Sociedad B | 2:3 | ||||
| 6. Round | 23/09/2017 | Real Sociedad B | - | Burgos CF | 0:1 | ||||
| 7. Round | 01/10/2017 | Caudal Deportivo | - | Real Sociedad B | 0:0 | ||||
| 10. Round | 22/10/2017 | Real Sociedad B | - | CD Tudelano | 4:3 |  |
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| 11. Round | 28/10/2017 | UD Logroñés | - | Real Sociedad B | 3:1 | |
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| 12. Round | 31/10/2017 | Real Sociedad B | - | SD Leioa | 0:0 | ||||
| 13. Round | 04/11/2017 | Real Sociedad B | - | Real Unión | 2:0 |  |
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| 20. Round | 06/01/2018 | Real Sociedad B | - | CD Izarra | 2:0 | ||||
| 21. Round | 13/01/2018 | Athletic Club B | - | Real Sociedad B | 2:0 | ||||
| 23. Round | 28/01/2018 | Barakaldo CF | - | Real Sociedad B | 2:0 | ||||
| 25. Round | 11/02/2018 | Burgos CF | - | Real Sociedad B | 0:0 | ||||
| 26. Round | 18/02/2018 | Real Sociedad B | - | Caudal Deportivo | 1:0 | ||||
| 27. Round | 25/02/2018 | CD Lealtad | - | Real Sociedad B | 0:1 | ||||
| 28. Round | 03/03/2018 | Real Sociedad B | - | CA Osasuna B | 0:0 | ||||
| 29. Round | 11/03/2018 | CD Tudelano | - | Real Sociedad B | 1:2 | ||||
| 30. Round | 18/03/2018 | Real Sociedad B | - | UD Logroñés | 2:0 |
Spain