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| 1st(1st leg) | FC Cartagena | - | Rayo Majadahonda | 2:1 (1:1) | ||
| 2nd (2nd leg) | Rayo Majadahonda | - | FC Cartagena | 1:0 (0:0) | ||
| 1st(1st leg): 19/05/2018 15:15 | 2nd (2nd leg): 27/05/2018 11:00 | Winner: Rayo Majadahonda | ||||
| 1st(1st leg) | RCD Mallorca | - | CD Mirandés | 3:1 (2:0) | ||
| 2nd (2nd leg) | CD Mirandés | - | RCD Mallorca | 0:0 (0:0) | ||
| 1st(1st leg): 20/05/2018 11:00 | 2nd (2nd leg): 27/05/2018 16:30 | Winner: RCD Mallorca | ||||
