| Heat 2 19:05 | time | gap | L | React. | 200m | 400m | 600m | | 1. Sierra Schmidt | USA | 8:27.54 | PR | 2 | 0.80 | 2:02.91 | 1. | 4:10.97 | 1. | 6:20.03 | 1. | | 2. Kristel Köbrich | CHI | 8:29.79 | 2.25 | 7 | 0.80 | 2:05.85 | 4. | 4:13.33 | 2. | 6:21.16 | 2. | | 3. Andreina Pinto | VEN | 8:31.08 | 3.54 | 5 | 0.75 | 2:05.82 | 3. | 4:15.20 | 4. | 6:24.57 | 4. | | 4. Brittany Maclean | CAN | 8:32.06 | 4.52 | 4 | 0.83 | 2:05.60 | 2. | 4:14.94 | 3. | 6:24.52 | 3. | | 5. Joanna Evans | BAH | 8:37.18 | 9.64 | 1 | 0.81 | 2:06.54 | 6. | 4:!6.54 | 6. | 6:27.39 | 5. | | 6. Courtney Harnish | USA | 8:38.00 | 10.46 | 3 | 0.84 | 2:05.85 | 4. | 4:15.60 | 5. | 6:27.52 | 6. | | 9. Carolina Bilich | BRA | 8:47.94 | 20.40 | 8 | 0.75 | 2:07.99 | 8. | 4:20.21 | 7. | 6:34.52 | 7. | | 10.Tabitha Baumann | CAN | 8:48.37 | 20.83 | 6 | 0.73 | 2:07.89 | 7. | 4:22.13 | 8. | 6:36.72 | 8. |
| World Record: Katie Ledecky (USA) 8:11.00, Shenandoah (USA), 22.06.2014. | | Pan American Games Record: Kaitlin Sandeno (USA) 8:34.65, Winnipeg (CAN), 06.08.1999. | | Qualification times. Standard A: 8:52.99, Standard B: 9:24.97. |
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| Heat 1 morning 10:05 | time | gap | L | React. | 200m | 400m | 600m | | 7. Bruna Veronez | BRA | 8:40.75 | | 5 | 0.73 | 2:05.87 | 1. | 4:17.22 | 1. | 6:28.94 | 1. | | 8. Monserrat Ortuño | MEX | 8:45.81 | 5.06 | 3 | 0.79 | 2:09.96 | 5. | 4:21.57 | 2. | 6:33.31 | 2. | | 11.Natalia Jaspeado | MEX | 8:53.70 | 12.95 | 4 | 0.75 | 2:09.69 | 4. | 4:24.71 | 5. | 6:40.06 | 4. | | 12.Valerie Gruest | GUA | 8:55.62 | 14.87 | 6 | 0.73 | 2:08.22 | 2. | 4:23.94 | 4. | 6:41.24 | 5. | | 13.Maria Alvarez | COL | 8:57.29 | 16.54 | 2 | 0.85 | 2:09.27 | 3. | 4:22.02 | 3. | 6:37.94 | 3. | | 14.Rebeca Quinteros | ESA | 9:07.98 | 27.23 | 8 | 0.83 | 2:13.66 | 6. | 4:33.55 | 7. | 6:50.49 | 6. | | 15.Daniella Van Den Berg | ARU | 9:12.30 | 31.55 | 7 | 0.77 | 2:14.06 | 7. | 4:32.65 | 6. | 6:52.17 | 7. | | 16.Lani Cabrera | BAR | 9:16.88 | 36.13 | 1 | 0.76 | 2:14.78 | 8. | 4:34.64 | 8. | 6:56.27 | 8. |
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| No qualification heats. Ranking made by time. Swimmers distributed in heats following their qualification results. | | |
| Swimmer | Q. time | Birth | | Heat 2 Night | | Brittany Maclean | CAN | 8:20.02 | 03 MAR 1994 | | Andreina Pinto | VEN | 8:30.66 | 10 SEP 1991 | | Courtney Harnish | USA | 8:31.88 | 17 APR 1999 | | Tabitha Baumann | CAN | 8:32.37 | 21 JUL 1995 | | Sierra Schmidt | USA | 8:34.58 | 06 MAY 1998 | | Kristel Köbrich | CHI | 8:38.15 | 09 AUG 1985 | | Joanna Evans | BAH | 8:39.61 | 25 JUL 1997 | | Carolina Bilich | BRA | 8:40.79 | 12 JUL 1995 | | Heat 1 Morning | | Natalia Jaspeado | MEX | 8:41.38 | 24 MAY 1998 | | Bruna Veronez | BRA | 8:42.80 | 02 FEB 1997 | | Monserrat Ortuño | MEX | 8:47.41 | 07 JAN 1993 | | Valerie Gruest | GUA | 8:51.18 | 14 MAR 1999 | | Maria Alvarez | COL | 8:52.64 | 10 OCT 1989 | | Standard A: 8:52.99 | | Daniella Van Den Berg | ARU | 8:59.38 | 24 MAY 1996 | | Lani Cabrera | BAR | 9:01.10 | 22 APR 1993 | | Rebeca Quinteros | ESA | 9:16.88 | 28 AUG 1997 | | Standard B: 9:24.97 |
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