| Final | time | Rk. | | 1. Mary Lou Elsenius | USA | 3:08.4 | | 2. Mary Jane Sears | USA | 3:09.0 | | 3. Beatriz Rohde | ARG | 3:09.4 | | 4. Mary Louise Gillet | USA | 3:19.9 | | 5. Irma Schluter | MEX | 3:21.5 | | 6. Wanda Castro | BRA | 3:21.6 | | 7. Adriana Hernandez | MEX | 3:23.0 | | 8. Helen Stewart | CAN | 3:24.8 |
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| Heat 1 | time | Rk. | | 1. Beatriz Rohde | ARG | 3:06.2 | | 2. Mary Lou Elsenius | USA | 3:14.4 | | 3. Irma Schluter | MEX | 3:16.5 | | 4. Margaret Peebles | CAN | 3:20.3 | | 5. Sonia Aparecida | BRA | 3:34.8 | | 6. Maria del Carmen Guardiola | MEX | 3:30.4 |
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| Heat 2 | time | Rk. | | 1. Mary Jane Sears | USA | 3:21.0 | | 2. Helen Stewart | CAN | 3:18.9 | | 3. Wanda Castro | BRA | 3:19.4 | | 4. Adriana Hernandez | MEX | 3:19.7 | | -. Rudy Bonder | CHI | DQ |
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