| Final 20:36 | time | gap | L | React. | 50m | | 1. Katie Meili |  USA | 1:06.26 | | 4 | 0.68 | 35.35s | 2. | | 2. Alia Atkinson |  JAM | 1:06.59 | 0.33 | 3 | 0.73 | 35.78s | 1. | | 3. Rachel Nicol |  CAN | 1:07.91 | 1.65 | 5 | 0.77 | 36.20s | 3. | | 4. Tera Van Beilen | CAN | 1:08.22 | 1.96 | 6 | 0.72 | 36.36s | 4. | | 5. Annie Lazor | USA | 1:08.72 | 2.46 | 7 | 0.71 | 36.58s | 5. | | 6. Beatriz Travalon |  BRA | 1:09.23 | 2.97 | 1 | 0.72 | 36.96s | 6. | | 7. Julia Sebastian |  ARG | 1:09.83 | 3.57 | 8 | 0.74 | 36.99s | 8. | | -. Jhennifer A Conceicao | BRA | DSQ | | 2 | | | |
| World Record: Ruta Meilutyte (LTU) 1:04.35, Barcelona (ESP), 27.07.2013. | | Pan American Games Record: Annamay Pierse (CAN) 1:07.78, Rio de Janeiro (BRA), 17.07.2007. | | Qualification times. Standard A: 1:11.89, Standard B: 1:16.20 |
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| Final B 20:36 | time | gap | L | React. | 50m | | 8. Macarena Ceballos | ARG | 1:09.03 | | 4 | 0.78 | 36.36s | 1. | | 9. Esther Gonzalez |  MEX | 1:10.54 | 1.51 | 3 | 0.77 | 37.00s | 3. | | 10.Mercedes Toledo |  VEN | 1:10.90 | 1.87 | 5 | 0.71 | 37.59s | 2. | | 11.Arantxa Medina | MEX | 1:11.32 | 2.29 | 6 | 0.72 | 37.50s | 5. | | 12.Lisa Blackburn |  BER | 1:14.45 | 5.42 | 8 | 0.78 | 39.54s | 7. | | 13.Paula Tamashiro |  PER | 1:14.84 | 5.81 | 7 | 0.78 | 39.33s | 8. | | 14.Laura Morley |  BAH | 1:15.20 | 6.17 | 2 | 0.77 | 40.37s | 6. | | 15.Evita Leter |  SUR | 1:15.38 | 6.35 | 1 | 0.73 | 41.67s | 4. |
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Heats - Friday 11.07 | | First 8 to Final. Next 8 to Final B. |
| Ranking | time | gap | L | React. | 50m | Heat | | 1. Katie Meili | USA | 1:05.64 | PR | 4 | 0.66 | 34.85s | 1. | Heat 2 | | 2. Rachel Nicol | CAN | 1:07.10 | 1.46 | 5 | 0.73 | 35.54s | 2. | Heat 3 | | 3. Alia Atkinson | JAM | 1:07.46 | 1.82 | 4 | 0.74 | 36.63s | 1. | Heat 3 | | 4. Tera Van Beilen | CAN | 1:08.11 | 2.47 | 4 | 0.74 | 36.18s | 1. | Heat 1 | | 5. Jhennifer A Conceicao | BRA | 1:08.75 | 3.11 | 5 | 0.72 | 36.44s | 2. | Heat 1 | | 6. Annie Lazor | USA | 1:08.94 | 3.30 | 6 | 0.72 | 36.70s | 2. | Heat 2 | | 7. Beatriz Travalon | BRA | 1:08.99 | 3.35 | 3 | 0.70 | 36.67s | 3. | Heat 3 | | 8. Julia Sebastian | ARG | 1:09.97 | 4.33 | 3 | 0.75 | 37.24s | 3. | Heat 2 | | to Final B | | 9. Macarena Ceballos | ARG | 1:10.02 | 4.38 | 5 | 0.70 | 37.04s | 4. | Heat 2 | | 10.Mercedes Toledo | VEN | 1:10.53 | 4.89 | 6 | 0.72 | 37.35s | 4. | Heat 1 | | 11.Esther Gonzalez | MEX | 1:10.83 | 5.19 | 6 | 0.71 | 37.04s | 4. | Heat 3 | | 12.Arantxa Medina | MEX | 1:11.70 | 6.06 | 3 | 0.71 | 38.55s | 3. | Heat 1 | | 13.Laura Morley | BAH | 1:14.70 | 9.06 | 7 | 0.77 | 39.80s | 5. | Heat 3 | | 14.Paula Tamashiro | PER | 1:15.46 | 9.82 | 7 | 0.77 | 39.69s | 6. | Heat 2 | | 15.Evita Leter | SUR | 1:15.84 | 10.20 | 2 | 0.72 | 41.99s | 5. | Heat 2 | | 16.Lisa Blackburn | BER | 1:16.14 | 10.50 | 2 | 0.77 | 41.08s | 6. | Heat 3 | | eliminated | | 17.Izzy Joachim |  VIN | 1:20.25 | 14.61 | 2 | 0.86 | 45.18s | 5. | Heat 1 | | 18.Oreoluwa Cherebin |  GRN | 1:21.52 | 15.88 | 7 | 0.76 | 44.39s | 6. | Heat 1 |
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| Swimmer | Q. time | Birth | | Alia Atkinson | JAM | 1:06.79 | 11 DEC 1988 | | Katie Meili | USA | 1:07.16 | 16 APR 1991 | | Tera Van Beilen | CAN | 1:08.11 | 30 MAR 1993 | | Rachel Nicol | CAN | 1:08.15 | 16 FEB 1993 | | Julia Sebastian | ARG | 1:08.85 | 23 NOV 1993 | | Jhennifer A Conceicao | BRA | 1:09.35 | 13 JUN 1997 | | Beatriz Travalon | BRA | 1:09.49 | 19 JUL 1993 | | Macarena Ceballos | ARG | 1:09.75 | 12 JAN 1995 | | Arantxa Medina | MEX | 1:10.59 | 03 AUG 1994 | | Esther Gonzalez | MEX | 1:10.68 | 26 JUN 1995 | | Annie Lazor | USA | 1:10.70 | 17 AUG 1994 | | Mercedes Toledo | VEN | 1:10.83 | 17 MAY 1989 | | Standard A: 1:11.89 | | Lisa Blackburn | BER | 1:12.86 | 19 NOV 1971 | | Evita Leter | SUR | 1:13.06 | 05 JUL 1995 | | Izzy Joachim | VIN | 1:14.69 | 11 MAY 2000 | | Laura Morley | BAH | 1:14.95 | 01 OCT 1996 | | Paula Tamashiro | PER | 1:15.64 | 29 AUG 2000 | | Standard B: 1:16.20 | | Oreoluwa Cherebin | GRN | 1:19.58 | 24 DEC 1997 |
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