| Final | time | | 1. Julia Sanchez Deze |  Peru | 12.2s | | 2. Jean Patton |  United States | 12.3s | | 3. Lilian Heinz |  Argentina | 12.7s | | 4. Janet Moreau | United States | 12.7s | | 5. Adriana Millard Pacheco |  Chile | 12.8s | | 6. Olga Bianchi | Argentina | 12.9s |
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| Semi 1 | time | | 1. Julia Sanchez Deze | Peru | 12.5s | | 2. Adriana Millard Pacheco | Chile | 12.8s | | 3. Olga Bianchi | Argentina | 12.9s | | 4. Dolores Dwyer | United States | 12.9s | | 5. Beatriz Kretschmer de Buccicardi | Chile | 13.0s | | 6. Deyse Jurdelina de Castro |  Brazil | 13.1s |
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| Semi 2 | time | | 1. Jean Patton | United States | 12.6s | | 2. Lilian Heinz | Argentina | 12.9s | | 3. Janet Moreau | United States | 13.2s | | 4. Elisabeth Clara Muller | Brazil | 13.2s | | 5. Helena Cardoso de Menezes | Brazil | 13.2s | | 6. Ana Maria Fontán | Argentina | 13.2s |
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| Heat 1 | time | | 1. Adriana Millard Pacheco | Chile | 12.7s | | 2. Dolores Dwyer | United States | 12.8s | | 3. Olga Bianchi | Argentina | 13.0s | | 4. Graviola Ewing |  Guatemala | 13.5s | | 5. Carmen Matos Garcia |  Ecuador | |
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| Heat 2 | time | | 1. Julia Sánchez Deze | Peru | 12.6s | | 2. Beatriz Kretschmer de Buccicardi | Chile | 12.8s | | 3. Deyse Jurdelina de Castro | Brazil | 13.1s | | 4. Esther Villalón |  Mexico | 13.5s | | 5. Leonor Estevez Bucheli | Ecuador | |
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| Heat 3 | time | | 1. Jean Patton | United States | 12.6s | | 2. Lilian Heinz | Argentina | 12.9s | | 3. Elisabeth Clara Muller | Brazil | 13.3s | | 4. Alejandrina Correa |  Colombia | 13.4s | | 5. Aida Mawyn Cedeno | Ecuador | |
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| Heat 4 | time | | 1. Janet Moreau | United States | 12.8s | | 2. Helena Cardoso de Menezes | Brazil | 13.0s | | 3. Ana Maria Fontán | Argentina | 13.1s | | 4. Cecilia Navarrete | Colombia | 13.3s | | 5. Eliana Gaete Lazo | Chile | |
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