| Heat No. | Lane No. | Bib No. | Name | Club/Country | Year of birth | SB | PB |
| 1 | 1 | 858 | Kormákur Ari Hafliðason | FH | 1997 | 51,09 | 51,09 |
| 1 | 2 | 824 | Ívar Kristinn Jasonarson | ÍR | 1992 | 48,88 | 48,02ú |
| 1 | 3 | 845 | Kolbeinn Höður Gunnarsson | UFA | 1995 | 47,87ú | 47,87ú |
| 1 | 4 | 855 | Jóhann Björn Sigurbjörnsson | UMSS | 1995 | 48,02ú | 48,02ú |