| 1. Round | 20/08/2017 | Athletic Club B | - | UD Logroñés | 1:2 | ||||
| 2. Round | 26/08/2017 | Real Sociedad B | - | Athletic Club B | 0:3 | ||||
| 3. Round | 02/09/2017 | Athletic Club B | - | Real Unión | 4:0 | ||||
| 4. Round | 09/09/2017 | Arenas de Getxo | - | Athletic Club B | 2:2 | ||||
| 31. Round | 25/03/2018 | CD Vitoria | - | Athletic Club B | 1:0 | ||||
| 32. Round | 29/03/2018 | Athletic Club B | - | Barakaldo CF | 1:0 | ||||
| 33. Round | 07/04/2018 | SD Amorebieta | - | Athletic Club B | 0:3 | ||||
| 34. Round | 14/04/2018 | Athletic Club B | - | Burgos CF | 3:1 |  |
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| 35. Round | 22/04/2018 | Caudal Deportivo | - | Athletic Club B | 1:2 | ||||
| 36. Round | 28/04/2018 | Athletic Club B | - | CD Lealtad | 8:0 |  |
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| 37. Round | 05/05/2018 | CA Osasuna B | - | Athletic Club B | 0:3 | |
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| 38. Round | 13/05/2018 | Athletic Club B | - | CD Tudelano | 2:0 |
Spain