| Final Sunday 07.08 | time | gap | L | React. | 100m | 200m | 300m | | 1. Kathleen Genevieve Ledecky |  USA | 3:56.46 | WR | 4 | 0.72 | 57.05s | 1. | 1:57.11 | 1. | 2:57.62 | 1. | | 2. Jaz Carlin |  GBR | 4:01.23 | 4.77 | 5 | 0.72 | 58.86s | 4. | 2:00.08 | 2. | 3:00.68 | 2. | | 3. Leah Smith | USA | 4:01.92 | 5.46 | 3 | 0.77 | 58.89s | 5. | 2:00.52 | 3. | 3:01.70 | 3. | | 4. Boglarka Kapas |  HUN | 4:02.37 | 5.91 | 1 | 0.68 | 59.67s | 3. | 2:00.68 | 5. | 3:02.32 | 4. | | 5. Brittany Maclean |  CAN | 4:04.69 | 8.23 | 2 | 0.71 | 58.58s | 2. | 2:00.52 | 3. | 3:02.89 | 5. | | 6. Tamsin Cook |  AUS | 4:05.30 | 8.84 | 8 | 0.72 | 59.74s | 8. | 2:02.24 | 8. | 3:04.78 | 8. | | 7. Jessica Ashwood | AUS | 4:05.68 | 9.22 | 7 | 0.80 | 59.61s | 7. | 2:02.00 | 7. | 3:04.40 | 6. | | 8. Coralie Balmy |  FRA | 4:06.98 | 10.52 | 6 | 0.70 | 59.38s | 6. | 2:01.85 | 6. | 3:04.77 | 7. |
| World record: Katie Ledecky (USA) | 3:58.37 | Gold Coast, Australia | 23 August 2014 | | Olympic record: Camille Muffat (FRA) | 4:01.45 | London, Great Britain | 29 July 2012 |
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Heats - Sunday 07.08 Afternoon |
| Ranking | time | gap | React. | 100m | 200m | 300m | HR | Heat | | 1. Katie Ledecky | USA | 3:58.71 | OR | 0.69 | 58.20s | 1:58.94 | 2:59.11 | 1. | 4 | | 2. Jaz Carlin | GBR | 4:02.83 | 4.12 | 0.73 | 58.83s | 2:00.16 | 3:01.76 | 1. | 3 | | 3. Leah Smith | USA | 4:03.39 | 4.68 | 0.80 | 58.56s | 2:00.23 | 3:01.95 | 2. | 3 | | 4. Coralie Balmy | FRA | 4:03.40 | 4.69 | 0.68 | 58.54s | 2:00.10 | 3:02.23 | 2. | 4 | | 5. Brittany Maclean | CAN | 4:03.43 | 4.72 | 0.72 | 58.49s | 1:59.72 | 3:01.79 | 3. | 3 | | 6. Jessica Ashwood | AUS | 4:03.58 | 4.87 | 0.80 | 59.20s | 2:00.72 | 3:02.54 | 4. | 3 | | 7. Boglarka Kapas | HUN | 4:04.11 | 5.40 | 0.66 | 1:00.03 | 2:01.42 | 3:02.98 | 3. | 4 | | 8. Tamsin Cook | AUS | 4:04.36 | 5.65 | 0.71 | 59.66s | 2:01.98 | 3:03.79 | 4. | 4 | | eliminated | | 9. Yuhan Zhang |  CHN | 4:06.30 | 7.59 | 0.66 | 59.78s | 2:02.41 | 3:05.55 | 1. | 2 | | 10.Sarah Kohler |  GER | 4:06.55 | 7.84 | 0.73 | 59.98s | 2:02.61 | 3:05.28 | 2. | 2 | | 11.Lotte Friis |  DEN | 4:07.13 | 8.42 | 0.78 | 1:00.03 | 2:02.09 | 3:04.86 | 3. | 2 | | 12.Chihiro Igarashi |  JPN | 4:07.52 | 8.81 | 0.68 | 59.62s | 2:02.64 | 3:05.94 | 1. | 1 | | 13.Joanna Evans |  BAH | 4:07.60 | 8.89 | 0.79 | 59.94s | 2:02.63 | 3:05.57 | 2. | 1 | | 14.Lauren Boyle |  NZL | 4:07.90 | 9.19 | 0.71 | 59.59s | 2:02.20 | 3:05.14 | 5. | 4 | | 15.Mireia Belmonte |  ESP | 4:08.12 | 9.41 | 0.67 | 1:00.11 | 2:02.39 | 3:05.45 | 5. | 3 | | 16.Andreina Pinto |  VEN | 4:08.34 | 9.63 | 0.71 | 59.44s | 2:02.02 | 3:05.52 | 4. | 2 | | 17.Melani Costa | ESP | 4:08.96 | 10.25 | 0.75 | 59.41s | 2:00.85 | 3:03.84 | 6. | 3 | | 18.Anja Klinar |  SLO | 4:09.07 | 10.36 | 0.78 | 1:00.88 | 2:02.78 | 3:05.73 | 6. | 4 | | bellow Olympic Qualifying Time – 4:09.08 | | 19.Sharon van Rouwendaal |  NED | 4:11.44 | 12.73 | 0.78 | 59.80s | 2:02.70 | 3:06.67 | 7. | 4 | | 20.Arina Openysheva |  RUS | 4:11.83 | 13.12 | 0.69 | 1:01.17 | 2:05.32 | 3:08.76 | 5. | 2 | | 21.Ajna Kesely | HUN | 4:12.40 | 13.69 | 0.76 | 1:00.28 | 2:02.81 | 3:07.09 | 6. | 2 | | 22.Alice Mizzau |  ITA | 4:14.20 | 15.49 | 0.73 | 59.58s | 2:02.52 | 3:07.91 | 7. | 3 | | 23.Katarina Simonovic |  SRB | 4:15.57 | 16.86 | 0.67 | 1:01.07 | 2:05.72 | 3:10.50 | 3. | 1 | | 24.Kristel Kobrich |  CHI | 4:16.07 | 17.36 | 0.79 | 1:01.78 | 2:06.45 | 3:11.63 | 4. | 1 | | 25.Emily Overholt | CAN | 4:16.24 | 17.53 | 0.77 | 1:01.14 | 2:05.96 | 3:11.34 | 7. | 2 | | 26.Anh Vien Nguyen |  VIE | 4:16.32 | 17.61 | 0.78 | 1:00.61 | 2:04.35 | 3:09.87 | 8. | 2 | | 27.Diletta Carli | ITA | 4:17.15 | 18.44 | 0.77 | 1:02.70 | 2:07.55 | 3:12.91 | 8. | 4 | | bellow Olympic Selection Time – 4:17.80 | | 28.Yue Cao | CHN | 4:19.57 | 20.86 | 0.77 | 59.18s | 2:03.74 | 3:11.38 | 8. | 3 | | 29.Valerie Gruest |  GUA | 4:19.58 | 20.87 | 0.69 | 1:00.41 | 2:06.47 | 3:13.26 | 5. | 1 | | 30.Lani Rose Cabrera |  BAR | 4:28.95 | 30.24 | 0.79 | 1:03.01 | 2:10.47 | 3:19.55 | 6. | 1 | | 31.Gabriella Doueihy |  LIB | 4:31.21 | 32.50 | 0.74 | 1:03.72 | 2:12.16 | 3:22.16 | 7. | 1 | | 32.Rebeca Quinteros |  ESA | 4:52.11 | 53.40 | 0.80 | 1:06.87 | 2:20.24 | 3:35.91 | 8. | 1 |
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| Olympic Qualifyng Time by NOC - 24 Swimmers - additional 9 Swimmers. | | Olympic Qualifying Time – 4:09.08 | | 2 Quotas - 7 NOC | | 2 |  Australia | Jessica Ashwood | Tamsin Cook | | 2 |  Canada | Brittany MacLean | Emily Overholt | | 2 |  China | Cao Yue | Zhang Yuhan | | 2 |  Hungary | Boglárka Kapás | Ajna Késely | | 2 |  Italy | Diletta Carli | Alice Mizzau | | 2 |  Spain | Mireia Belmonte | Melani Costa | | 2 |  United_States | Katie Ledecky | Leah Smith | | 1 Quota - 10 NOC | | 1 |  Denmark | Lotte Friis | | 1 |  France | Coralie Balmy | | 1 |  Germany | Sarah Köhler | | 1 |  Great_Britain | Jazmin Carlin | | 1 |  Netherlands | Sharon van Rouwendaal | | 1 |  New_Zealand | Lauren Boyle | | 1 |  Russia | Arina Openysheva | | 1 |  Slovenia | Anja Klinar | | 1 |  Venezuela | Andreina Pinto | | 1 |  Vietnam | Nguyễn Thị Ánh Viên | | Olympic Selection Time – 4:17.80 - 6 NOC | | 1 |  Bahamas | Joanna Evans - [a] | | 1 |  Brazil | Manuella Lyrio - [a] | | 1 |  Chile | Kristel Köbrich - [a] | | 1 |  Guatemala | Valerie Gruest - [a] | | 1 |  Japan | Chihiro Igarashi - [a] | | 1 |  Serbia | Katarina Simonović - [a] | | Universalitiy Places - 3 NOC | | 1 |  Barbados | Lani Cabrera | | 1 |  El Salvador | Rebeca Quinteros | | 1 |  Lebanon | Gabrielle Doueihy | | 33 | Total |
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| Olympic Qualifyng Time (OQT) 4:09.08 - NOC can enter up to 2 swimmers with OQT. | | Olympic Selection Time (OST) 4:17.80, invitational - A swwimer meeting the "invitation" standard was eligible for entry. But this entry was allotted/filled by ranking. |
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