| Date | 16 August 2010 | 
|---|---|
| Status | YOG | 
| Location | Singapore Sports School, Singapore | 
| Participants | 40 from 10 countries | 
Top 8 times advanced to final.
| Pos | Lane | Swimmer | NOC | Time | Exchange (Pos) | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | – | Australia |  AUS | 4:13.12 | |||||
| Zoe Johnson | – | – (–) | |||||||
| Emma McKeon | – | – (–) | |||||||
| Emily Selig | – | – (–) | |||||||
| Madi Wilson | – | – (–) | |||||||
| 2 | – | Germany |  GER | 4:13.38 | |||||
| Dörte Baumert | – | – (–) | |||||||
| Lena Kalla | – | – (–) | |||||||
| Lina Rathsack | – | – (–) | |||||||
| Juliane Reinhold | – | – (–) | |||||||
| 3 | – | Japan |  JPN | 4:19.00 | |||||
| Maya Hamano | – | – (–) | |||||||
| Mina Ochi | – | – (–) | |||||||
| Mayuko Okada | – | – (–) | |||||||
| Yukiko Watanabe | – | – (–) | |||||||
| 4 | – | South Africa |  RSA | 4:24.41 | |||||
| Oneida Cooper | – | – (–) | |||||||
| Natasha de Vos | – | – (–) | |||||||
| Kyla Ferreira | – | – (–) | |||||||
| Taryn MacKenzie | – | – (–) | |||||||
| 5 | – | Brazil |  BRA | 4:25.66 | |||||
| Carolina Bergamaschi | – | – (–) | |||||||
| Júlia Gerotto | – | – (–) | |||||||
| Alessandra Marchioro | – | – (–) | |||||||
| Bruna Rocha | – | – (–) | 
| Pos | Lane | Swimmer | NOC | Time | Exchange (Pos) | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | – | Russian Federation |  RUS | 4:13.43 | |||||
| Yekaterina Andreyeva | – | – (–) | |||||||
| Olga Detenyuk | – | – (–) | |||||||
| Kristina Kochetkova | – | – (–) | |||||||
| Aleksandra Papusha | – | – (–) | |||||||
| 2 | – | People's Republic of China |  CHN | 4:13.63 | |||||
| Bai Anqi | – | – (–) | |||||||
| Liu Lan | – | – (–) | |||||||
| Tang Yi | – | – (–) | |||||||
| Wang Chang | – | – (–) | |||||||
| 3 | – | Canada |  CAN | 4:17.94 | |||||
| Lindsay Delmar | – | – (–) | |||||||
| Lauren Earp | – | – (–) | |||||||
| Rachel Nicol | – | – (–) | |||||||
| Tera Van Beilen | – | – (–) | |||||||
| 4 | – | United States |  USA | 4:26.15 | |||||
| Kiera Janzen | – | – (–) | |||||||
| Kaitlyn Jones | – | – (–) | |||||||
| Jordan Mattern | – | – (–) | |||||||
| Allison Roberts | – | – (–) | |||||||
| 5 | – | Singapore |  SGP | 4:28.56 | |||||
| Chriselle Koh | – | – (–) | |||||||
| Amanda Lim | – | – (–) | |||||||
| Cheryl Lim | – | – (–) | |||||||
| Adeline Winata | – | – (–) | |||||||
| – | Italy |  ITA | – | 
| Pos | Lane | Swimmer | NOC | Time | Exchange (Pos) | ||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | – | Australia |  AUS | 4:09.68 | |||||
| Zoe Johnson | – | – (–) | |||||||
| Emma McKeon | – | – (–) | |||||||
| Emily Selig | – | – (–) | |||||||
| Madi Wilson | – | – (–) | |||||||
| 2 | – | Russian Federation |  RUS | 4:11.07 | |||||
| Yekaterina Andreyeva | – | – (–) | |||||||
| Olga Detenyuk | – | – (–) | |||||||
| Kristina Kochetkova | – | – (–) | |||||||
| Aleksandra Papusha | – | – (–) | |||||||
| 3 | – | Germany |  GER | 4:11.76 | |||||
| Dörte Baumert | – | – (–) | |||||||
| Lena Kalla | – | – (–) | |||||||
| Lina Rathsack | – | – (–) | |||||||
| Juliane Reinhold | – | – (–) | |||||||
| 4 | – | Canada |  CAN | 4:16.72 | |||||
| Lindsay Delmar | – | – (–) | |||||||
| Lauren Earp | – | – (–) | |||||||
| Rachel Nicol | – | – (–) | |||||||
| Tera Van Beilen | – | – (–) | |||||||
| 5 | – | Japan |  JPN | 4:16.80 | |||||
| Maya Hamano | – | – (–) | |||||||
| Mina Ochi | – | – (–) | |||||||
| Mayuko Okada | – | – (–) | |||||||
| Yukiko Watanabe | – | – (–) | |||||||
| 6 | – | South Africa |  RSA | 4:23.52 | |||||
| Oneida Cooper | – | – (–) | |||||||
| Natasha de Vos | – | – (–) | |||||||
| Kyla Ferreira | – | – (–) | |||||||
| Taryn MacKenzie | – | – (–) | |||||||
| 7 | – | Brazil |  BRA | 4:24.62 | |||||
| Carolina Bergamaschi | – | – (–) | |||||||
| Júlia Gerotto | – | – (–) | |||||||
| Alessandra Marchioro | – | – (–) | |||||||
| Bruna Rocha | – | – (–) | |||||||
| – | People's Republic of China |  CHN | – | ||||||
| Bai Anqi | – | – (–) | |||||||
| Liu Lan | – | – (–) | |||||||
| Tang Yi | – | – (–) | |||||||
| Wang Chang | – | – (–) |