| Final: Start time: 21:20 +1 UTC, Temperature 21° C, Humidity 40 % _ |
| Final Ranking | time | | L | Q | React. | | 1. Trinidad Tobago |  TTO | 2:58.12 | WL | 7 | 2. | 0.154 | | Jarrin Solomon 46.10s, Jereem Richards 43.60s 1:29.70, Machel Cedenio 44.40s 2:14.10s, Lalonde Gordon 44.02s | | 2. United States |  USA | 2:58.61 | SB | 4 | 1. | 0.183 | | Wilbert London III 44.80s, Gil Roberts 44.00s 1:28.80, Michael Cherry 45.10s 2:13.90, Fred Kerley 44.71s | | 3. Great Britain NI |  GBR | 2:59.00 | SB | 3 | 4. | 0.143 | | Matthew HudsoN-Smith 45.50s, Dwayne Cowan 44.10s 1:29.60, Rabah Yousif 45.00s 2:14.60, Martyn Rooney 44.40s | | 4. Belgium |  BEL | 3:00.04 | | 9 | 3. | 0.150 | | Robin Vanderbemden 46.00s, Jonathan Borlee 45.10s 1:31.10, Dylan Borlee 45.30s 2:16.40, Kévin Borlee 43.64s | | 5. Spain |  ESP | 3:00.65 | NR | 6 | 6. | 0.197 | | Óscar Husillos 45.60s, Lucas Bua 45.00s 1:30.60, Darwin Echeverry 45.30s 2:15.90, Samuel Garcia 44.75s | | 6. Cuba |  CUB | 3:01.10 | SB | 8 | 8. | 0.217 | | Williams Collazo 46.60s, Adrián Chacon 45.10s 1:31.70, Osmaidel Pellicier 45.10s 2:16.80, Yoandys Lescay 44.30s | | 7. Poland |  POL | 3:01.59 | SB | 5 | 7. | 0.177 | | Kajetan Duszynski 46.00s, Rafal Omelko 44.80s 1:30.80, Lukasz Krawczuk 45.50s 2:16.30, Tymoteusz Zimny 45.29s | | 8. France |  FRA | 3:01.79 | | 2 | 5. | 0.189 | | Ludvy Vaillant 45.60s, Thomas Jordier 45.70s 1:31.30, Mamoudou Eliman Hanne 45.00s 2:16.30, Teddy Atine-Venel 45.49s |
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| | | Intermediate times: | | 400m: United States 44.80s | | 800m: United States 1:28.80 | | 1200m: United States 2:13.90 |
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