Head to Head
| Denmark Series Group 1 | 2021/05/16 12:00 | Frederikssund IK v Union | L | 4-2 |
| Denmark Series Group 1 | 2020/09/19 12:00 | Union v Frederikssund IK | W | 3-1 |
| Denmark Series Group 2 | 2019/11/01 18:00 | Union v Frederikssund IK | L | 2-3 |
| Denmark Series Group 2 | 2019/08/31 11:00 | Frederikssund IK v Union | W | 0-4 |
Home History
| Denmark Danmarksserien Relegation | 2021/06/30 17:00 | Union v Otterup | W | 3-0 |
| Denmark Danmarksserien Relegation | 2021/06/23 16:30 | Vordingborg IF v Union | W | 1-3 |
| Denmark Danmarksserien Relegation | 2021/06/19 12:00 | Union v Roskilde Boldklub | W | 5-1 |
| Denmark Danmarksserien Relegation | 2021/06/12 12:00 | Union v B 1908 | L | 0-1 |
| Denmark Danmarksserien Relegation | 2021/06/05 11:00 | Greve v Union | D | 0-0 |
| Denmark Danmarksserien Relegation | 2021/05/29 12:00 | Union v Taastrup FC | D | 2-2 |
| Denmark Danmarksserien Relegation | 2021/05/22 11:30 | Skjold Birkerød v Union | W | 1-2 |
| Denmark Series Group 1 | 2021/05/16 12:00 | Frederikssund IK v Union | L | 4-2 |
Away History
| Denmark Danmarksserien Promotion | 2021/06/26 12:00 | Ledøje-Smørum Fodbold v Frederikssund IK | L | 2-0 |
| Denmark Danmarksserien Promotion | 2021/06/23 17:00 | Frederikssund IK v Herlev | W | 9-2 |
| Denmark Danmarksserien Promotion | 2021/06/19 11:00 | Frederikssund IK v Allerød | W | 2-1 |
| Denmark Danmarksserien Promotion | 2021/06/12 10:00 | GVI v Frederikssund IK | D | 2-2 |
| Denmark Danmarksserien Promotion | 2021/06/09 17:00 | Herlev v Frederikssund IK | L | 1-0 |
| Denmark Danmarksserien Promotion | 2021/06/05 11:00 | Frederikssund IK v Ledøje-Smørum Fodbold | D | 2-2 |
| Denmark Danmarksserien Promotion | 2021/05/29 11:00 | Allerød v Frederikssund IK | D | 1-1 |
| Denmark Series Play-Offs | 2021/05/22 11:00 | Frederikssund IK v GVI | L | 1-2 |