| 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 | ||||
| 4. Round | 10/09/2017 | CD Mirandés | - | Peña Sport FC | 1:0 |  |
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| 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 | ||||
| 7. Round | 30/09/2017 | SD Leioa | - | Peña Sport FC | 3:0 | ||||
| 8. Round | 08/10/2017 | Peña Sport FC | - | CD Izarra | 0:1 | ||||
| 10. Round | 21/10/2017 | Peña Sport FC | - | CD Vitoria | 1:2 | ||||
| 12. Round | 01/11/2017 | Peña Sport FC | - | SD Amorebieta | 2:2 | |
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| 15. Round | 18/11/2017 | CD Lealtad | - | Peña Sport FC | 1:1 | |
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| 16. Round | 26/11/2017 | Peña Sport FC | - | CA Osasuna B | 1:0 | ||||
| 17. Round | 03/12/2017 | CD Tudelano | - | Peña Sport FC | 0:1 |  |
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| 18. Round | 09/12/2017 | Peña Sport FC | - | UD Logroñés | 1:1 | ||||
| 23. Round | 28/01/2018 | Peña Sport FC | - | CD Mirandés | 1:3 | ||||
| 24. Round | 04/02/2018 | Sporting Gijón B | - | Peña Sport FC | 1:1 | ||||
| 27. Round | 25/02/2018 | CD Izarra | - | Peña Sport FC | 0:1 | ||||
| 28. Round | 04/03/2018 | Peña Sport FC | - | Athletic Club B | 1:1 | ||||
| 38. Round | 13/05/2018 | Peña Sport FC | - | Real Sociedad B | 1:3 |
Spain