| 15. Round | 01/12/2018 | Athletic Club B | - | UP Langreo | 5:1 | ||||
| 17. Round | 15/12/2018 | Athletic Club B | - | CD Calahorra | 3:2 | ||||
| 23. Round | 03/02/2019 | Athletic Club B | - | SD Leioa | 2:1 | ||||
| 24. Round | 09/02/2019 | SD Gernika | - | Athletic Club B | 2:1 | ||||
| 27. Round | 02/03/2019 | Athletic Club B | - | Real Sociedad B | 2:2 | ||||
| 35. Round | 28/04/2019 | Athletic Club B | - | Sporting Gijón B | 0:2 | ||||
| 36. Round | 05/05/2019 | CD Calahorra | - | Athletic Club B | 0:3 | ||||
| 37. Round | 12/05/2019 | Athletic Club B | - | Real Unión | 2:0 |
Spain