2. Round | 25/10/2020 | SD Leioa | - | Real Unión | 0:1 | ||||
4. Round | 08/11/2020 | CD Laredo | - | Real Unión | 1:0 | ||||
8. Round | 05/12/2020 | Real Unión | - | Arenas de Getxo | 1:1 | ||||
10. Round | 20/12/2020 | Real Unión | - | Club Portugalete | 2:1 | ||||
11. Round | 10/01/2021 | Athletic Bilbao B | - | Real Unión | 0:0 | ||||
9. Round | 13/01/2021 | Racing Santander | - | Real Unión | 1:3 | ||||
12. Round | 16/01/2021 | CD Alavés B | - | Real Unión | 0:1 |