2018 Final Stage
Quarter-finals
| 1 | Campbelltown City | Canberra Croatia | 3 : 0 |
| 2 | Perth SC | Sydney Olympic | 0 : 1 |
| 3 | Queensland Lions | Edgeworth E. | 1 : 0 |
| 4 | Devonport | Heidelberg Utd | 2 : 3 |
Semi-finals
| 1 | Campbelltown City | Sydney Olympic | 2 : 1 |
| 2 | Queensland Lions | Heidelberg Utd | 2 : 1 |
Final
| 1 | Campbelltown City | Queensland Lions | 2 : 1 |
2018 Main
| Pl | W | D | L | Diff | Pts | |||
| 1 | Perth SC | 26 | 17 | 4 | 5 | 55:26 | 29 | 55 |
| 2 | Perth Glory U21 | 26 | 16 | 6 | 4 | 72:32 | 40 | 54 |
| 3 | Cockburn City | 26 | 14 | 6 | 6 | 59:40 | 19 | 48 |
| 4 | Bayswater | 26 | 15 | 2 | 9 | 55:30 | 25 | 47 |
| 5 | Inglewood Utd | 26 | 13 | 7 | 6 | 50:38 | 12 | 46 |
| 6 | Perth RedStar | 26 | 13 | 5 | 8 | 48:37 | 11 | 44 |
| 7 | Floreat Athena | 26 | 12 | 5 | 9 | 53:43 | 10 | 41 |
| 8 | Sorrento | 26 | 10 | 4 | 12 | 50:49 | 1 | 34 |
| 9 | Stirling Lions | 26 | 10 | 2 | 14 | 51:53 | -2 | 32 |
| 10 | Armadale | 26 | 9 | 5 | 12 | 48:52 | -4 | 32 |
| 11 | Balcatta | 26 | 9 | 2 | 15 | 40:59 | -19 | 29 |
| 12 | Subiaco | 26 | 7 | 5 | 14 | 29:46 | -17 | 26 |
| 13 | Forrestfield | 26 | 5 | 7 | 14 | 34:58 | -24 | 22 |
| 14 | Joondalup United | 26 | 1 | 2 | 23 | 21:102 | -81 | 5 |
Promotion ~ National Premier Leagues Play Offs
Promotion ~ NPL Western Australia (Play Offs: )
NPL Western Australia (Relegation)
2018 Play Offs
Quarter-finals
| 1 | Perth SC (1) | Perth Glory U21 (2) | 3 : 4 |
| 4 | Cockburn City (3) | Bayswater (4) | 4 : 3 |
Semi-finals
| 1 | Perth Glory U21 (2) | Bye | |
| 2 | Perth SC (1) | Cockburn City (3) | 2 : 1 |
Final
| 1 | Perth Glory U21 (2) | Perth SC (1) | 1 : 4 |
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