| Final 19:14 | time | gap | L | React. | 50m | | 1. Etiene Medeiros |  BRA | 59.61s | PR | 3 | 0.65 | 30.51s | 1. | | 2. Olivia Smoliga |  USA | 1:00.06 | 0.45 | 4 | 0.69 | 30.92s | 2. | | 3. Clara Smiddy | USA | 1:00.49 | 0.88 | 6 | 0.63 | 31.16s | 4. | | 4. Dominique Bouchard |  CAN | 1:00.54 | 0.93 | 5 | 0.62 | 31.23s | 3. | | 5. Hilary Caldwell | CAN | 1:01.01 | 1.40 | 2 | 0.63 | 31.01s | 8. | | 6. Maria Gonzalez |  MEX | 1:01.06 | 1.45 | 1 | 0.61 | 31.28s | 6. | | 7. Gisela Morales |  GUA | 1:01.31 | 1.70 | 7 | 0.64 | 31.57s | 5. | | 8. Andrea Berrino |  ARG | 1:01.76 | 2.15 | 8 | 0.65 | 31.91s | 7. |
| World Record: Gemma Spofforth (GBR) 58.12s, Roma (ITA), 28.07.2009. | | Pan American Games Record: Rachel Bootsma (USA) 1:00.37, Guadalajara (MEX), 16.11.2011. | | Qualification times. Standard A: 1:04.09, Standard B: 1:07.94 |
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| Final B 19:09 | time | gap | L | React. | 50m | | 9. Natalia De Luccas | BRA | 1:02.15 | | 4 | 0.49 | 32.43s | 1. | | 10.Carolina Colorado |  COL | 1:02.16 | 0.01 | 5 | 0.64 | 32.15s | 2. | | 11.Isabella Arcila | COL | 1:02.44 | 0.29 | 3 | 0.60 | 32.03s | 3. | | 12.Estela Davis | MEX | 1:03.19 | 1.04 | 6 | 0.60 | 32.63s | 5. | | 13.Carla Gonzalez |  VEN | 1:03.68 | 1.53 | 2 | 0.60 | 33.24s | 4. | | 14.Karen Vilorio |  HON | 1:05.06 | 2.91 | 7 | 0.65 | 33.71s | 6. | | 15.Florencia Perotti | ARG | 1:05.18 | 3.03 | 1 | 0.68 | 33.77s | 7. | | 16.Ines Remersaro |  URU | 1:05.78 | 3.63 | 8 | 0.66 | 34.11s | 8. |
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Heats - Friday 17.07 10:05 | | First 8 to Final. Next 8 to Final B. |
| Ranking | time | gap | L | React. | 50m | Heat | | 1. Olivia Smoliga | USA | 1:00.35 | PR | 5 | 0.86 | 31.04s | 1. | Heat 3 | | 2. Dominique Bouchard | CAN | 1:00.44 | 0.09 | 4 | 0.66 | 30.97s | 2. | Heat 3 | | 3. Etiene Medeiros | BRA | 1:00.74 | 0.39 | 4 | 0.63 | 31.06s | 3. | Heat 1 | | 4. Clara Smiddy | USA | 1:00.79 | 0.44 | 5 | 0.64 | 31.34s | 1. | Heat 1 | | 5. Hilary Caldwell | CAN | 1:00.97 | 0.62 | 4 | 0.60 | 30.94s | 3. | Heat 2 | | 6. Gisela Morales | GUA | 1:00.99 | 0.64 | 6 | 0.63 | 31.46s | 2. | Heat 1 | | 7. Maria Gonzalez | MEX | 1:01.25 | 0.90 | 3 | 0.62 | 31.35s | 2. | Heat 2 | | 8. Andrea Berrino | ARG | 1:01.32 | 0.97 | 5 | 0.63 | 32.09s | 1. | Heat 2 | | to Final B | | 9. Natalia De Luccas | BRA | 1:01.89 | 1.54 | 3 | 0.49 | 32.06s | 3. | Heat 3 | | 10.Carolina Colorado | COL | 1:02.10 | 1.75 | 6 | 0.69 | 31.90s | 4. | Heat 3 | | 11.Isabella Arcila | COL | 1:02.62 | 2.27 | 3 | 0.60 | 32.42s | 4. | Heat 1 | | 12.Estela Davis | MEX | 1:03.36 | 3.01 | 6 | 0.60 | 32.67s | 4. | Heat 2 | | 13.Carla Gonzalez | VEN | 1:04.09 | 3.74 | 7 | 0.59 | 33.35s | 5. | Heat 2 | | 14.Karen Vilorio | HON | 1:04.29 | 3.94 | 2 | 0.64 | 33.30s | 5. | Heat 1 | | 15.Florencia Perotti | ARG | 1:04.81 | 4.46 | 2 | 0.69 | 33.29s | 5. | Heat 3 | | 16.Mckenna De Bever |  PER | 1:05.00 | 4.65 | 2 | 0.66 | 33.91s | 6. | Heat 2 | | 17.Ines Remersaro | URU | 1:05.21 | 4.86 | 7 | 0.66 | 33.41s | 6. | Heat 3 | | eliminated | | 18.Sharon Bravo |  ECU | 1:08.36 | 8.01 | 7 | 0.70 | 35.22s | 6. | Heat 1 | | 19.Jamaris Washshah |  ISV | 1:10.50 | 10.15 | 1 | 0.64 | 37.06s | 7. | Heat 3 |
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| Swimmer | Q. time | Birth | | Dominique Bouchard | CAN | 1:00.20 | 29 MAY 1991 | | Hilary Caldwell | CAN | 1:00.54 | 13 MAR 1991 | | Etiene Medeiros | BRA | 1:00.61 | 24 MAY 1991 | | Olivia Smoliga | USA | 1:01.04 | 12 OCT 1994 | | Andrea Berrino | ARG | 1:01.04 | 14 FEB 1994 | | Clara Smiddy | USA | 1:01.22 | 04 JAN 1996 | | Natalia De Luccas | BRA | 1:01.39 | 13 SEP 1996 | | Maria Gonzalez | MEX | 1:01.57 | 25 APR 1990 | | Isabella Arcila | COL | 1:02.04 | 11 MAR 1994 | | Carolina Colorado | COL | 1:02.07 | 07 SEP 1987 | | Estela Davis | MEX | 1:03.11 | 28 OCT 1994 | | Gisela Morales | GUA | 1:03.18 | 17 DEC 1987 | | Florencia Perotti | ARG | 1:04.02 | 24 SEP 1992 | | Standard A: 1:04.09 | | Mckenna De Bever | PER | 1:04.61 | 05 JUN 1996 | | Karen Vilorio | HON | 1:04.61 | 27 MAY 1993 | | Ines Remersaro | URU | 1:04.64 | 02 DEC 1992 | | Carla Gonzalez | VEN | 1:05.04 | 17 DEC 1997 | | Standard B: 1:07.94 | | Sharon Bravo | ECU | 1:08.13 | 25 MAY 1994 | | Allyson Ponson |  ARU | 1:09.75 | 04 DEC 1995 | | Jamaris Washshah | ISV | 1:14.49 | 27 JUN 1997 |
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