| 2. Round | 26/08/2017 | Arenas de Getxo | - | Peña Sport FC | 1:0 | ||||
| 3. Round | 03/09/2017 | Peña Sport FC | - | SD Gernika | 0:1 | ||||
| 5. Round | 17/09/2017 | Peña Sport FC | - | Sporting Gijón B | 1:6 | ||||
| 6. Round | 24/09/2017 | Racing Santander | - | Peña Sport FC | 2:0 |  |
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| 7. Round | 30/09/2017 | SD Leioa | - | Peña Sport FC | 3:0 | ||||
| 8. Round | 08/10/2017 | Peña Sport FC | - | CD Izarra | 0:1 | |
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| 9. Round | 15/10/2017 | Athletic Club B | - | Peña Sport FC | 4:1 | ||||
| 10. Round | 21/10/2017 | Peña Sport FC | - | CD Vitoria | 1:2 | |
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| 17. Round | 03/12/2017 | CD Tudelano | - | Peña Sport FC | 0:1 | ||||
| 18. Round | 09/12/2017 | Peña Sport FC | - | UD Logroñés | 1:1 | |
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| 19. Round | 17/12/2017 | Real Sociedad B | - | Peña Sport FC | 1:1 | ||||
| 20. Round | 07/01/2018 | Real Unión | - | Peña Sport FC | 0:0 | ||||
| 22. Round | 20/01/2018 | SD Gernika | - | Peña Sport FC | 3:1 | ||||
| 25. Round | 10/02/2018 | Peña Sport FC | - | Racing Santander | 1:1 | ||||
| 38. Round | 13/05/2018 | Peña Sport FC | - | Real Sociedad B | 1:3 |
Spain