2. Round | 25/10/2020 | SD Leioa | - | Real Unión | 0:1 | ||||
4. Round | 08/11/2020 | CD Laredo | - | Real Unión | 1:0 | ||||
5. Round | 15/11/2020 | Real Unión | - | Barakaldo CF | 2:1 | ||||
1. Round | 18/11/2020 | Real Unión | - | CD Alavés B | 1:2 | ||||
6. Round | 22/11/2020 | Real Sociedad B | - | Real Unión | 0:1 | ||||
21. Round | 21/03/2021 | Club Portugalete | - | Real Unión | 2:0 | ||||
22. Round | 28/03/2021 | Real Unión | - | Athletic Bilbao B | 0:1 |