| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 385 | Josh HOEY |
USA |
1:45.23 Q | |
| 2 | 1 | 3 | 392 | Brandon MILLER |
USA |
1:46.84 Q | |
| 3 | 2 | 1 | 368 | Tom DRADRIGA |
UGA |
1:46.98 Q | |
| 4 | 2 | 3 | 303 | Samuel CHAPPLE |
NED |
1:47.05 Q | |
| 5 | 3 | 3 | 100 | Heithem CHENITEF |
ALG |
1:47.30 PB | |
| 6 | 4 | 3 | 281 | Alex Ngeno KIPNGETICH |
KEN |
1:47.53 | |
| 7 | 3 | 1 | 325 | Patryk SIERADZKI |
POL |
1:47.55 | |
| 8 | 5 | 3 | 177 | Álvaro DE ARRIBA |
ESP |
1:47.58 | |
| 9 | 6 | 3 | 248 | Giovanni LAZZARO |
ITA |
1:48.06 | |
| 10 | 1 | 2 | 117 | Eliott CRESTAN |
BEL |
1:48.65 Q | |
| 11 | 2 | 2 | 175 | Elvin Josué CANALES |
ESP |
1:48.70 Q | |
| 12 | 4 | 1 | 280 | Noah KIBET |
KEN |
1:48.90 | |
| 13 | 3 | 2 | 288 | Ebrahim ALZOFAIRI |
KUW |
1:49.37 | |
| 14 | 4 | 2 | 332 | John RIVERA |
PUR |
1:49.49 | .481 |
| 15 | 5 | 2 | 163 | Jakub DUDYCHA |
CZE |
1:49.49 | .483 |
| 16 | 6 | 2 | 135 | Robert HEPPENSTALL |
CAN |
1:49.54 | |
| 17 | 5 | 1 | 152 | Xiaoheng XI |
CHN |
1:49.59 | |
| 18 | 6 | 1 | 196 | Yanis MEZIANE |
FRA |
2:23.96 |
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second