| Heat 1: Start: 20:-- Temperature: 2-° C Humidity: -- |
| Rk | Ranking | time | | L | _____________ | | 1. |  Jamaica | 41.80s | Q, SB | 7 | | | Jodean Williams, Tia Clayton, Tina Clayton, Jonielle Smith | | 2. |  Spain | 42.53s | Q | 5 | | | Esperança Cladera, Jaël Bestué, Paula Sevilla, María Isabel Pérez | | 3. |  France | 42.71s | Q, SB | 9 | | | Marie-Ange Rimlinger, Sarah Richard, Helene Parisot, Gémima Joseph | | 4. |  Netherlands | 43.62s | | 6 | | | Isabel van den Berg, Britt de Blaauw, Marije van Hunenstijn, Demi van den Wildenberg | | 5. |  Chile | 44.07s | | 2 | | | Macarena Borie, María Ignacia Montt, Isidora Jiménez, Anais Hernández | | 6. |  Italy | 49.41s | | 4 | | | Vittoria Fontana, Gloria Hooper, Dalia Kaddari, Alessia Pavese | | -. |  Australia | DNF | | 3 | | | Ella Connolly, Bree Rizzo, Kristie Edwards, Torrie Lewis | | -. |  Belgium | TR24.7L | DQ | 8 | | | Rani Vincke, Rani Rosius, Janie De Naeyer, Delphine Nkansa |
| Heat 2: Start: 20:-- Temperature: --° C Humidity: -- |
| Rk | Ranking | time | | L | _____________ | | 1. |  United States | 41.60s | Q, WL | 5 | | | Jacious Sears, Twanisha Terry, Kayla White, Sha'Carri Richardson | | 2. |  Germany | 41.86s | Q, SB | 8 | | | Sina Mayer, Rebekka Haase, Sophia Junk, Gina Lückenkemper | | 3. |  Great Britain | 41.88s | Q | 7 | | | Dina Asher-Smith, Success Eduan, Desiree Henry, Daryll Neita | | 4. |  Canada | 42.38s | q, NR | 6 | | | Sade McCreath, Jacqueline Madogo, Marie-Éloïse Leclair, Audrey Leduc | | 5. |  Poland | 42.83s | q, SB | 3 | | | Magdalena Niemczyk, Pia Skrzyszowska, Krystsina Tsimanouskaya, Ewa Swoboda | | 6. |  China | 42.94s | SB | 4 | | | Liang Xiaojing, Li Yuting, Zhu Junying, Chen Yujie | | 7. |  Ivory Coast | 44.64s | | 2 | | | Dinedye Denis, Maboundou Koné, Jessika Gbai, Lou Yonan Chantal Djehi | | —. |  Switzerland | DNF | | 9 | | | Géraldine Frey, Céline Bürgi, Léonie Pointet, Ajla Del Ponte |
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