| 2. Round | 31/08/2019 | Athletic Club B | - | CD Calahorra | 0:0 | ||||
| 3. Round | 08/09/2019 | Cultural Leonesa | - | Athletic Club B | 5:2 | ||||
| 10. Round | 26/10/2019 | Athletic Club B | - | Real Valladolid B | 4:1 | ||||
| 12. Round | 10/11/2019 | Burgos CF | - | Athletic Club B | 2:0 | ||||
| 14. Round | 24/11/2019 | CD Guijuelo | - | Athletic Club B | 2:0 | ||||
| 15. Round | 01/12/2019 | Athletic Club B | - | CD Izarra | 3:3 | ||||
| 16. Round | 06/12/2019 | SD Leioa | - | Athletic Club B | 1:0 | ||||
| 20. Round | 15/01/2020 | Athletic Club B | - | Haro Deportivo | 2:3 | ||||
| 21. Round | 19/01/2020 | CD Calahorra | - | Athletic Club B | 2:3 | ||||
| 22. Round | 26/01/2020 | Athletic Club B | - | Cultural Leonesa | 1:0 | ||||
| 24. Round | 08/02/2020 | Athletic Club B | - | CD Tudelano | 1:0 | ||||
| 25. Round | 15/02/2020 | CA Osasuna B | - | Athletic Club B | 1:1 | ||||
| 26. Round | 22/02/2020 | Athletic Club B | - | Arenas de Getxo | 1:1 | ||||
| 28. Round | 07/03/2020 | Athletic Club B | - | Real Unión | 3:3 |  |
Spain