Heat 1
| POS | BIB | ATHLETE | COUNTRY | MARK |
| 1 | 310 | Abdelaati Iguider | MAR | 3:40.13 Q |
| 2 | 216 | Aman Wote | ETH | 3:40.20 Q |
| 3 | 403 | Ben Blankenship | USA | 3:40.23 |
| 4 | 341 | Marcin Lewandowski | POL | 3:40.78 |
| 5 | 236 | Chris O’Hare | GBR | 3:42.46 |
| 6 | 315 | Dario Ivanovski | MKD | 3:51.83 PB |
| 7 | 370 | Dey Tuach Dey | SSD | 3:56.10 NIR |
Heat 2
| POS | BIB | ATHLETE | COUNTRY | MARK |
| 1 | 214 | Samuel Tefera | ETH | 3:44.00 Q |
| 2 | 295 | Vincent Kibet | KEN | 3:44.26 Q |
| 3 | 108 | Ryan Gregson | AUS | 3:44.44 |
| 4 | 196 | Marc Alcalá | ESP | 3:45.49 |
| 5 | 179 | Jakub Holuša | CZE | 3:45.84 |
| 6 | 374 | Kalle Berglund | SWE | 3:46.61 |
| 7 | 299 | Musa Hajdari | KOS | 3:47.68 NIR |
| 8 | 258 | Harvey Dixon | GIB | 3:49.89 NIR |
