| 1. Round | 07/04/2021 | SD Amorebieta | - | CD Tudelano | 3:0 | ||||
| 2. Round | 11/04/2021 | CD Tudelano | - | Athletic Club B | 1:4 |  |
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| 3. Round | 18/04/2021 | Real Sociedad B | - | CD Tudelano | 3:2 | |
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| 4. Round | 25/04/2021 | CD Tudelano | - | SD Amorebieta | 1:2 | ||||
| 5. Round | 01/05/2021 | Athletic Club B | - | CD Tudelano | 3:1 | |
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| 6. Round | 09/05/2021 | CD Tudelano | - | Real Sociedad B | 1:2 |
Spain