| Final Sunday 04.03 | time | | L | React. | | 1. United States |  USA | 3:23.86 | CR | 5 | 0.221 | | 2. Poland |  POL | 3:26.09 | NIR | 1 | 0.293 | | 3. Great Britain & NI |  GBR | 3:29.38 | SB | 3 | 0.263 | | 4. Ukraine |  UKR | 3:31.32 | SB | 4 | 0.263 | | 5. Italy |  ITA | 3:31.55 | NIR | 2 | 0.254 | | -. Jamaica |  JAM | DSQ | | 6 | 0.291 |
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| Intermediate times | | 400m: United States 51.56s | | 800m: United States 1:42.43 | | 1200m: United States 2:33.70 |
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| World Indoor Record: Russia 3:23.37 28 Jan 2006 Glasgow, Great Britain. | | World Indoor Lead: University of Oregon (USA) 3:30.18 10 Feb 2018 Albuquerque, United States. | | World Indoor Championship Record: Russia 3:23.88 7 Mar 2004 Budapest, Hungary. |
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Heats - Saturday 03.03 | | First 2 and best 2 advanced to Final. |
| Heat 1 13:20 | time | | L | React. | | -. Nigeria |  NGR | 3:--.-- | | 2 | | -. Kazakhstan |  KAZ | 3:--.-- | | 3 | | -. Great Britain & NI | GBR | 3:--.-- | | 4 | | -. United States | USA | 3:--.-- | | 5 | | -. Italy | ITA | 3:--.-- | | 6 |
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| Intermediate times | | 400m: | | 800m: | | 1200m: |
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| Heat 2 13:30 | time | | L | React. | | -. Czechia |  CZE | 3:--.-- | | 2 | | -. Jamaica | JAM | 3:--.-- | | 3 | | -. Poland | POL | 3:--.-- | | 4 | | -. Ukraine | UKR | 3:--.-- | | 5 | | -. Portugal |  POR | 3:--.-- | | 6 |
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| Intermediate times | | 400m: | | 800m: | | 1200m: |
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| Team | 2018 | Best | L | | -. Nigeria | NGR | | 3:29.67 | 1.2 | | -. Kazakhstan | KAZ | 3:41.67 | 3:37.59 | 1.3 | | -. Great Britain & NI | GBR | | 3:27.56 | 1.4 | | -. United States | USA | 3:30.18 | 3:24.83 | 1.5 | | -. Italy | ITA | | 3:31.99 | 1.6 | | -. Czechia | CZE | | 3:28.47 | 2.2 | | -. Jamaica | JAM | | 3:26.54 | 2.3 | | -. Poland | POL | | 3:28.95 | 2.4 | | -. Ukraine | UKR | 3:40.13 | 3:30.13 | 2.5 | | -. Portugal | POR | 3:46.30 | 3:41.51 | 2.6 |
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