| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | ms* | 
|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 2786 | Ferguson Cheruiyot ROTICH |  KEN | 1:43.75 Q | |
| 2 | 2 | 1 | 1077 | Peter BOL |  AUS | 1:44.13 Q AR | |
| 3 | 3 | 1 | 2047 | Elliot GILES |  GBR | 1:44.49 Q | |
| 4 | 4 | 1 | 2887 | Abdelati EL GUESSE |  MAR | 1:44.84 q PB | |
| 5 | 1 | 4 | 1269 | Nijel AMOS |  BOT | 1:45.04 Q | |
| 6 | 5 | 1 | 3937 | Isaiah JEWETT |  USA | 1:45.07 q | |
| 7 | 2 | 4 | 2787 | Michael SARUNI |  KEN | 1:45.21 Q | |
| 8 | 1 | 2 | 1420 | Marco AROP |  CAN | 1:45.26 Q | |
| 9 | 3 | 4 | 1784 | Adrián BEN |  ESP | 1:45.30 Q | |
| 10 | 1 | 6 | 2780 | Emmanuel Kipkurui KORIR |  KEN | 1:45.33 Q | |
| 11 | 2 | 6 | 3186 | Mateusz BORKOWSKI |  POL | 1:45.34 Q | |
| 12 | 4 | 4 | 1095 | Jeffrey RISELEY |  AUS | 1:45.41 q | |
| 13 | 2 | 2 | 1225 | Amel TUKA |  BIH | 1:45.48 Q | |
| 14 | 1 | 3 | 3956 | Clayton MURPHY |  USA | 1:45.53 Q | |
| 15 | 3 | 2 | 1978 | Gabriel TUAL |  FRA | 1:45.63 Q | |
| 16 | 5 | 4 | 2891 | Oussama NABIL |  MAR | 1:45.64 q | .632 | 
| 17 | 3 | 6 | 3935 | Bryce HOPPEL |  USA | 1:45.64 Q | .638 | 
| 18 | 2 | 3 | 2064 | Daniel ROWDEN |  GBR | 1:45.73 Q | .723 | 
| 19 | 3 | 3 | 3648 | Abdessalem AYOUNI |  TUN | 1:45.73 Q SB | .728 | 
| 20 | 4 | 3 | 1087 | Charlie HUNTER |  AUS | 1:45.91 q | |
| 21 | 6 | 4 | 1947 | Pierre-Ambroise BOSSE |  FRA | 1:45.97 q | |
| 22 | 5 | 3 | 1807 | Saúl ORDÓÑEZ |  ESP | 1:45.98 | |
| 23 | 6 | 1 | 3027 | Tony VAN DIEPEN |  NED | 1:46.03 | |
| 24 | 4 | 6 | 2894 | Mostafa SMAILI |  MAR | 1:46.05 | |
| 25 | 4 | 2 | 1810 | Pablo SÁNCHEZ-VALLADARES |  ESP | 1:46.06 | |
| 26 | 1 | 5 | 2930 | Jesus Tonatiu LOPEZ |  MEX | 1:46.14 Q | |
| 27 | 2 | 5 | 1193 | Eliott CRESTAN |  BEL | 1:46.19 Q | |
| 28 | 5 | 6 | 1007 | Yassine HETHAT |  ALG | 1:46.20 | |
| 29 | 6 | 3 | 1435 | Brandon MCBRIDE |  CAN | 1:46.32 | |
| 30 | 5 | 2 | 3565 | Andreas KRAMER |  SWE | 1:46.44 | |
| 31 | 3 | 5 | 3190 | Patryk DOBEK |  POL | 1:46.59 Q | |
| 32 | 4 | 5 | 2343 | Mark ENGLISH |  IRL | 1:46.75 | |
| 33 | 6 | 2 | 2043 | Oliver DUSTIN |  GBR | 1:46.94 | |
| 34 | 7 | 4 | 3273 | Ryan SÁNCHEZ |  PUR | 1:47.07 | |
| 35 | 5 | 5 | 1976 | Benjamin ROBERT |  FRA | 1:47.12 | |
| 36 | 7 | 2 | 1534 | Alex BEDDOES |  COK | 1:47.26 NR | |
| 37 | 7 | 1 | 1021 | Pol MOYA |  AND | 1:47.44 SB | |
| 38 | 6 | 6 | 3289 | Abubaker Haydar ABDALLA |  QAT | 1:47.45 | |
| 39 | 8 | 4 | 1305 | Thiago ANDRÉ |  BRA | 1:47.75 | |
| 40 | 7 | 3 | 1873 | Melese NBERET |  ETH | 1:47.80 | |
| 41 | 6 | 5 | 1165 | Eric NZIKWINKUNDA |  BDI | 1:47.97 | |
| 42 | 8 | 2 | 1381 | Francky MBOTTO |  CAF | 1:48.26 NR | |
| 43 | 8 | 1 | 2825 | Musa HAJDARI |  KOS | 1:48.96 | |
| 44 | 7 | 6 | 3278 | Wesley VÁZQUEZ |  PUR | 1:49.06 SB | |
| 45 | 7 | 5 | 3265 | Andrés ARROYO |  PUR | 1:53.09 | |
| 46 | 8 | 5 | 1680 | Dennick LUKE |  DMA | 1:54.30 | |
| 47 | 8 | 3 | 1729 | James Nyang CHIENGJIEK |  ART | 2:02.04 | |
| 6 | 1678 | Ayanleh SOULEIMAN |  DJI | DNS | 
ms - Milliseconds - shown when two or more competitors finish with the same time down to hundredths of a second