| Final | time | | 1. Leonore Fisher | CAN | 1:16.7 | | 2. Cora O'Connor | USA | 1:17.8 | | 3. Cynthia Gill | USA | 1:17.9 | | 4. Shelley Mann | USA | 1:18.2 | | 5. Sara Barber | CAN | 1:18.8 | | 6. Isa Teixeira | BRA | 1:20.4 | | 7. Vanna Rocco | ARG | 1:20.6 | | 8. Liliana Gonzalles | ARG | NT |
|
|
| Heat 1 | time | Rk. | | 1. Cynthia Gill | USA | 1:17.6 | | 2. Cora O'Connor | USA | 1:18.0 | | 3. Sara Barber | CAN | 1:19.0 | | 4. Isa Teixeira | BRA | 1:20.5 | | 5. Elvia Ramirez | MEX | 1:25.4 | | 6. Cristina Kujath | ARG | 1:28.5 |
|
| Heat 2 | time | Rk. | | 1. Leonore Fisher | CAN | 1:16.8 | | 2. Shelley Mann | USA | 1:18.0 | | 3. Vanna Rocco | ARG | 1:20.3 | | 4. Liliana Gonzalles | ARG | 1:21.0 | | 5. Gloria Botelia | MEX | 1:21.7 | | 6. Shirley Jones | CAN | 1:24.6 |
|
|