| Final 19:27 |   | time | gap | L | Ag | pts | 200m | 400m | 600m | Ol |  | 1. Simona Quadarella |   Italy | 8:17.44 |   | 5 | 25 | 925 | 2:02.51 | 4:07.64 | 6:13.86 | QT |  | 2. Isabel Gose |   Germany | 8:17.53 | +0.09s | 4 | 21 | 925 | 2:01.55 | 4:07.13 | 6:13.78 | QT |  | 3. Erika Fairweather |   New Zealand | 8:22.26 | +4.82s | 3 | 20 | 899 | 2:01.08 | 4:07.09 | 6:15.72 | QT |  | 4. Eve Thomas |   New Zealand | 8:24.86 | +7.42s | 6 | 23 | 885 | 2:03.53 | 4:10.89 | 6:19.29 | QT |  | 5. Agostina Hein |   Argentina | 8:29.19 | +11.75s | 2 | 15 | 863 | 2:03.58 | 4:12.77 | 6:22.46 | CT |  | 6. Ichika Kajimoto |   Japan | 8:29.24 | +11.80s | 8 | 19 | 862 | 2:05.79 | 4:14.02 | 6:22.86 | CT |  | 7. Kiah Melverton |   Australia | 8:29.35 | +11.91s | 1 | 27 | 862 | 2:03.71 | 4:12.95 | 6:23.00 |  | 8. Ajna Kesely |   Hungary | 8:29.83 | +12.39s | 7 | 22 | 859 | 2:05.28 | 4:13.78 | 6:22.61 |  | 9. Maddy Gough |   Australia | 8:36.43 | +18.99s | 0 | 24 | 827 | 2:06.50 | 4:15.80 | 6:26.37 |   
| World Record: Katie Ledecki, United States 8:04.79 OG Rio de Janeiro, Brazil 12th August 2016 |  | Championship Record: Katie Ledecki, United States 8:07.39 Kazan, Russia 8th August 2015 |  | Olympic Qualification Time (14th Tokyo 2020): 8:26.71. Olympic Consideration Time (+0.5% OQT): 8:29.24. |  | OQT - First 4. OCT - First 6. |   
|
 Heats - Friday, 16th February 10:07 |  | Best 8 times had to advance to Final. 8th place was tied and 9 swimmers advanced. No OQT or OCT in Heats. |   
    | Heat 3 10:28 |   | time | gap | L | Ag | pts | Rk | 200m | 400m | 600m |  | 1. Simona Quadarella |   Italy | 8:27.80 | +1.31s | 4 | 25 | 870 | 2. | 2:04.21 | 4:12.34 | 6:21.16 |  | 2. Erika Fairweather |   New Zealand | 8:28.15 | +1.66s | 5 | 20 | 868 | 3. | 2:03.88 | 4:12.24 | 6:21.60 |  | 3. Eve Thomas |   New Zealand | 8:29.30 | +2.81s | 3 | 23 | 862 | 4. | 2:04.85 | 4:14.11 | 6:22.97 |  | 4. Agostina Hein |   Argentina | 8:29.44 | +2.95s | 2 | 15 | 861 | 5. | 2:05.93 | 4:15.18 | 6:23.74 |  | 5. Maddy Gough |   Australia | 8:35.25 | +8.76s | 6 | 24 | 832 | 8. | 2:07.26 | 4:16.40 | 6:26.26 |  | 6. Peiqi Yang |   China | 8:36.75 | +10.26s | 7 | 16 | 825 | 10. | 2:07.21 | 4:16.93 | 6:27.21 |  | 7. Gabrielle Roncatto |   Brazil | 8:37.00 | +10.51s | 9 | 25 | 824 | 11. | 2:04.77 | 4:16.13 | 6:28.07 |  | 8. Beatriz Dizotti |   Brazil | 8:43.73 | +17.24s | 1 | 23 | 793 | 17. | 2:08.89 | 4:21.11 | 6:33.12 |  | 9. Tamila Holub |   Portugal | 8:45.94 | +19.45s | 0 | 24 | 783 | 19. | 2:07.18 | 4:18.14 | 6:31.38 |  | -. Dune Coetzee |   South Africa | DNS |   | 8 | 21 | - | -. |   |   |   
| Heat 2 10:18 |   | time | gap | L | Ag | pts | Rk | 200m | 400m | 600m |  | 1. Isabel Gose |   Germany | 8:26.49 |   | 4 | 21 | 876 | 1. | 2:03.72 | 4:10.75 | 6:18.67 |  | 2. Ajna Kesely |   Hungary | 8:32.88 | +6.39s | 3 | 22 | 844 | 6. | 2:05.97 | 4:13.92 | 6:23.05 |  | 3. Kiah Melverton |   Australia | 8:35.22 | +8.73s | 6 | 27 | 833 | 7. | 2:06.81 | 4:17.81 | 6:27.84 |  | 4. Ichika Kajimoto |   Japan | 8:35.25 | +8.76s | 8 | 19 | 832 | 8. | 2:06.62 | 4:17.10 | 6:27.96 |  | 5. Yonghui Ma |   China | 8:37.66 | +11.17s | 7 | 17 | 821 | 12. | 2:06.36 | 4:17.56 | 6:28.31 |  | 6. Merve Tuncel |   Turkey | 8:38.10 | +11.61s | 0 | 19 | 819 | 13. | 2:07.14 | 4:17.69 | 6:29.14 |  | 7. Kristel Kobrich |   Chile | 8:38.81 | +12.32s | 9 | 38 | 815 | 14. | 2:07.34 | 4:17.90 | 6:28.80 |  | 8. Kayla Han |   United States | 8:40.36 | +13.87s | 2 | 15 | 808 | 15. | 2:07.24 | 4:17.51 | 6:28.63 |  | 9. Alisee Pisane |   Belgium | 8:45.28 | +18.79s | 1 | 21 | 786 | 18. | 2:07.47 | 4:19.18 | 6:32.95 |  | -. Anastasiia Kirpichnikova |   France | DNS |   | 5 | 23 | - | -. |   |   |   
| Heat 1 10:07 |   | time | gap | L | Ag | pts | Rk | 200m | 400m | 600m |  | 1. Ella Cosgrove |   Canada | 8:43.33 | +16.84s | 4 | 16 | 794 | 16. | 2:08.15 | 4:20.21 | 6:31.64 |  | 2. Imani De Jong |   Netherlands | 8:49.08 | +22.59s | 3 | 21 | 769 | 20. | 2:08.33 | 4:22.36 | 6:36.50 |  | 3. Ashley Lim |   Singapore | 8:54.29 | +27.80s | 6 | 18 | 747 | 21. | 2:09.52 | 4:24.23 | 6:39.78 |  | 4. Dakyung Han |   South Korea | 8:54.74 | +28.25s | 5 | 24 | 745 | 22. | 2:08.84 | 4:23.70 | 6:41.05 |  | 5. Diana Taszhanova |   Kazakhstan | 8:55.78 | +29.29s | 2 | 20 | 740 | 23. | 2:06.69 | 4:20.85 | 6:39.55 |  | 6. Eva Petrovska |   N. Macedonia | 9:04.27 | +37.78s | 1 | 19 | 706 | 24. | 2:13.13 | 4:30.09 | 6:48.16 |  | 7. Lana Hijazi |   Lebanon | 9:33.90 | +1:07.41s | 8 | 15 | 602 | 25. | 2:18.82 | 4:45.11 | 7:10.95 |  | -. Marlene Kahler |   Austria | DNS |   | 7 | 22 | - | -. |   |   |   
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