| 1. Jornada | 28.02.2021 | Pohang Steelers | - | Incheon United | 2:1 |  |
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| 2. Jornada | 06.03.2021 | Incheon United | - | Daegu FC | 2:1 | |
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| 3. Jornada | 09.03.2021 | Ulsan Hyundai FC | - | Incheon United | 3:1 | ||||
| 4. Jornada | 13.03.2021 | Incheon United | - | FC Seoul | 0:1 | ||||
| 5. Jornada | 17.03.2021 | Incheon United | - | Suwon FC | 4:1 | ||||
| 6. Jornada | 21.03.2021 | Gangwon FC | - | Incheon United | 2:0 | ||||
| 7. Jornada | 04.04.2021 | Gwangju FC | - | Incheon United | 2:1 | |
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| 8. Jornada | 07.04.2021 | Incheon United | - | Suwon Bluewings | 0:0 | ||||
| 9. Jornada | 11.04.2021 | Jeonbuk FC | - | Incheon United | 5:0 | ||||
| 10. Jornada | 17.04.2021 | Incheon United | - | Jeju United | 0:3 | ||||
| 17. Jornada | 14.07.2021 | FC Seoul | - | Incheon United | 0:1 | ||||
| 21. Jornada | 23.07.2021 | Suwon Bluewings | - | Incheon United | 1:2 | ||||
| 22. Jornada | 31.07.2021 | Jeju United | - | Incheon United | 1:4 | ||||
| 23. Jornada | 08.08.2021 | Incheon United | - | Suwon FC | 0:0 | |
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| 25. Jornada | 15.08.2021 | Gwangju FC | - | Incheon United | 1:0 | ||||
| 27. Jornada | 25.08.2021 | Incheon United | - | Daegu FC | 2:0 | ||||
| 29. Jornada | 11.09.2021 | Incheon United | - | Jeju United | 1:2 |
Corea del Sur