| Final 11.08 11:17 | Team | time | L | Rk. | | 1. Rebecca Adlington | GBR | 4:03.22 | 5 | 2. | | 2. Katie Hoff | USA | 4:03.29 | 3 | 3. | | 3. Joanne Jackson | GBR | 4:03.52 | 6 | 4. | | 4. Coralie Balmy | FRA | 4:03.60 | 7 | 6. | | 5. Federica Pellegrini | ITA | 4:04.56 | 4 | 1. | | 6. Camelia Alina Potec | ROU | 4:04.66 | 1 | 7. | | 7. Bronte Barratt | AUS | 4:05.05 | 2 | 5. | | 8. Laure Manaudou | FRA | 4:11.26 | 8 | 8. |
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| Round | H | Athl. | date |
| | Heats | 6 | 42 | 10.08 |
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| Heat 6 10.08 20:38 | Team | time | L | Rk. | | 1. Federica Pellegrini | ITA | 4:02.19 | 4 | 1. | | 2. Rebecca Adlington | GBR | 4:02.24 | 3 | 2. | | 3. Stephanie Horner | CAN | 4:07.45 | 1 | 11. | | 4. Kate Ziegler | USA | 4:09.59 | 5 | 14. | | 4. Flavia Rigamonti | SUI | 4:09.59 | 7 | 14. | | 6. Melissa Corfe | RSA | 4:10.54 | 2 | 17. | | 7. Jaana Ehmcke | GER | 4:15.15 | 8 | 25. | | 8. Ai Shibata | JPN | 4:17.96 | 6 | 31. |
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| Heat 5 10.08 20:32 | Team | time | L | Rk. | | 1. Katie Hoff | USA | 4:03.71 | 4 | 3. | | 2. Joanne Jackson | GBR | 4:03.80 | 6 | 4. | | 3. Bronte Barratt | AUS | 4:04.16 | 3 | 5. | | 4. Coralie Balmy | FRA | 4:04.25 | 5 | 6. | | 5. Wendy Trott | RSA | 4:08.38 | 2 | 12. | | 6. Lotte Friis | DEN | 4:08.47 | 7 | 13. | | 7. Gabriella Fagundez | SWE | 4:11.40 | 1 | 18. | | 8. Mo Li | CHN | 4:15.50 | 8 | 26. |
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| Heat 4 10.08 20:25 | Team | time | L | Rk. | | 1. Camelia Alina Potec | ROU | 4:04.55 | 6 | 7. | | 2. Laure Manaudou | FRA | 4:04.93 | 4 | 8. | | 3. Otylia Jedrzejczak | POL | 4:05.50 | 5 | 9. | | 4. Linda Mackenzie | AUS | 4:05.91 | 3 | 10. | | 5. Joerdis Steinegger | AUT | 4:09.72 | 8 | 16. | | 6. Savannah King | CAN | 4:11.49 | 1 | 19. | | 7. Miao Tan | CHN | 4:12.35 | 7 | 22. | | 8. Erika Villaecija | ESP | 4:14.25 | 2 | 23. |
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| Heat 3 10.08 20:18 | Team | time | L | Rk. | | 1. Susana Escobar | MEX | 4:11.99 | 3 | 20. | | 2. Monique Ferreira | BRA | 4:12.21 | 5 | 21. | | 3. Hoi Shun Stephanie Au | HKG | 4:14.82 | 6 | 24. | | 4. Eleftheria Evgenia Efstathiou | GRE | 4:15.78 | 2 | 27. | | 5. Daria Belyakina | RUS | 4:16.21 | 4 | 28. | | 6. Lynette Lim | SIN | 4:17.67 | 1 | 30. | | 7. Cecilia Elizabeth Biagioli | ARG | 4:19.85 | 7 | 34. | | 8. Chin-Kuei Yang | TPE | 4:24.78 | 8 | 40. |
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| Heat 2 10.08 20:11 | Team | time | L | Rk. | | 1. Yanel Andreina Pinto Perez | VEN | 4:18.09 | 2 | 32. | | 2. Nataliya Khudyakova | UKR | 4:18.34 | 1 | 33. | | 3. Eva Lehtonen | FIN | 4:20.07 | 7 | 35. | | 4. Kristina Lennox-Silva | PUR | 4:20.17 | 3 | 36. | | 5. Jieun Lee | KOR | 4:21.53 | 6 | 37. | | 6. Cai Lin Khoo | MAS | 4:23.37 | 5 | 38. | | 7. Golda Marcus | ESA | 4:23.50 | 4 | 39. |
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| Heat 1 10.08 20:04 | Team | time | L | Rk. | | 1. Boglarka Kapas | HUN | 4:16.22 | 4 | 29. | | 2. Shrone Austin | SEY | 4:35.86 | 3 | 41. | | &. Natthanan Junkrajang | THA | DNS | 5 | |
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