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Heats - Friday, 19th August | | First 3 teams from each Heat and Best 2 times advenced to Final. |
| Rk | Heat 1 | time | | L | | 1. |  Great Britain | 42.83s | Q | 6 | |
Asha Philip, Imani-Lara Lansiquot, Bianca Williams, Ashleigh Nelson | | 2. |  Spain | 42.95s | Q | 4 | |
Sonia Molina-Prados, Jaël Bestué, Paula Sevilla, María Isabel Pérez | | 4. |  Italy | 43.28s | Q | 2 | |
Zaynab Dosso, Gloria Hooper, Anna Bongiorni, Alessia Pavese | | 7. |  Belgium | 43.58s | q, SB | 7 | |
Elise Mehuys, Delphine Nkansa, Rani Vincke, Rani Rosius | | 10. |  Sweden | 44.10s | | 8 | |
Julia Henriksson, Daniella Busk, Filippa Sivnert, Elvira Tanderud | | 12. |  Denmark | 44.20s | | 5 | |
Mette Graversgaard, Mathilde Kramer, Emma Beiter Bomme, Astrid Glenner-Frandsen | | 13. |  Greece | 44.58s | | 1 | |
Styliani-Alexandra Michailidou, Elisavet Pesiridou, Artemis Melina Anastasiou, Rafailía Spanoudaki-Hatziriga | | -. |  Austria | DQ | | 3 | |
Viktoria Willhuber, Susanne Walli, Magdalena Lindner, Lena Pressler |
| 3. |  France | 43.24s | Q, SB | 8 | |
Floriane Gnafoua, Gémima Joseph, Helene Parisot, Mallory Leconte | | 5. |  Germany | 43.33s | Q | 4 | |
Alexandra Burghardt, Lisa Mayer, Jessica-Bianca Wessolly, Rebekka Haase | | 6. |  Poland | 43.49s | Q | 7 | |
Magdalena Stefanowicz, Martyna Kotwiła, Marika Popowicz-Drapała, Ewa Swoboda | | 8. |  Netherlands | 43.75s | q | 2 | |
N'Ketia Seedo, Zoë Sedney, Minke Bisschops, Naomi Sedney | | 9. |  Switzerland | 43.93s | | 1 | |
Géraldine Frey, Ajla del Ponte, Salomé Kora, Melissa Gutschmidt | | 11. |  Hungary | 44.19s | SB | 6 | |
Anna Luca Kocsis, Jusztina Csóti, Boglárka Takács, Lili Anna Tóth | | 14. |  Finland | 44.73s | | 3 | |
Johanna Kylmänen, Aino Pulkkinen, Anniina Korteetmaa, Anna Pursiainen | | -. |  Czechia | DNF | | 5 | |
Eva Kubíčková, Tereza Lamačová, Natálie Kožuškaničová, Johana Kaiserová |
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