13. Round | 13/05/2018 | Sangju Sangmu | - | Incheon United | 3:2 | ||||
15. Round | 07/07/2018 | Jeonbuk FC | - | Incheon United | 3:3 | ||||
16. Round | 11/07/2018 | Incheon United | - | Gangwon FC | 3:3 | ||||
17. Round | 14/07/2018 | Gyeongnam FC | - | Incheon United | 3:0 | ||||
18. Round | 18/07/2018 | Suwon Bluewings | - | Incheon United | 5:2 | ||||
21. Round | 04/08/2018 | Incheon United | - | Pohang Steelers | 1:2 | ||||
22. Round | 11/08/2018 | Daegu FC | - | Incheon United | 2:1 |