| Final Sunday 04.03 | time | | L | React. | | 1. Poland |  POL | 3:01.77 | WR | 4 | 0.150 | | 2. United States |  USA | 3:01.97 | SB | 6 | 0.138 | | 3. Belgium |  BEL | 3:02.51 | NIR | 5 | 0.159 | | 4. Trinidad Tobago |  TTO | 3:02.52 | NIR | 1 | 0.211 | | 5. Czechia |  CZE | 3:04.87 | SB | 2 | 0.203 | | 6. Great Britain & NI |  GBR | 3:05.08 | SB | 3 | 0.127 |
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| Intermediate times | | 400m: United States 44.84s | | 800m: United States 1:30.23 | | 1200m: United States 2:16.33 |
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| World Indoor Record: United States 3:02.13 8 Mar 2016 Sopot, Poland. | | World Indoor Lead: University of Sout Carolina (USA) 3:01.98 10 Feb 2018 Clemson, United States. | | World Indoor Championship Record: United States 3:02.13 8 Mar 2016 Sopot, Poland. |
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Heats | | First 2 and best 2 advanced to Final. |
| Heat 1 12:31 | time | | L | React. | Rk. | | 1. Belgium | BEL | 3:05.22 | SB | 6 | 0.187 | 2. | | 2. Poland | POL | 3:05.24 | SB | 5 | 0.237 | 4. | | 3. Trinidad Tobago | TTO | 3:05.96 | SB | 3 | 0.148 | 5. | | 4. Czechia | CZE | 3:06.40 | SB | 4 | 0.228 | 6. | | -. Ukraine |  UKR | DNS | | 2 | |
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| Intermediate times | | 400m: Poland 46.47s | | 800m: Poland 1:32.61 | | 1200m: Poland 2:19.00 |
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| Heat 2 12:43 | time | | L | React. | Rk. | | 1. United States | USA | 3:04.00 | Q SB | 6 | 0.151 | 1. | | 2. Great Britain & NI | GBR | 3:05.29 | Q SB | 5 | 0.138 | 3. | | 3. Spain |  ESP | 3:07.52 | SB | 2 | 0.157 | 7. | | 4. Dominicana |  DOM | 3:10.45 | SB | 3 | 0.238 | 8. | | -. Jamaica |  JAM | DNS | | 4 | |
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| Intermediate times | | 400m: United States 45.20s | | 800m: United States 1:31.77 | | 1200m: United States 2:17.65 |
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| Team | 2018 | Best | L | | -. Ukraine | UKR | | 3:07.54 | 1.2 | | -. Trinidad Tobago | TTO | | 3:05.51 | 1.3 | | -. Czechia | CZE | | 3:04.09 | 1.4 | | -. Poland | POL | | 3:02.97 | 1.5 | | -. Belgium | POL | | 3:02.87 | 1.6 | | -. Spain | ESP | | 3:06.60 | 2.2 | | -. Dominicana | DOM | | 3:06.30 | 2.3 | | -. Jamaica | JAM | | 3:03.69 | 2.4 | | -. Great Britain & NI | GBR | | 3:03.20 | 2.5 | | -. United States | USA | 3:02.35 | 3:01.96 | 2.6 |
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