| Final | time | L | | 1. Wanda Werner | USA | 2:32.5 | | 2. Liliana Gonzalias | ARG | 2:32.9 | | 3. Hilda Aranda | MEX | 2:33.9 | | 4. Susan Gray | USA | 2:33.7 | | 5. Beth Whitthall | CAN | 2:37.7 | | 6. Gladys Priestley | CAN | 2:37.8 |
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| Heat 1 | time | L | | 1. Gilda Aranda | MEX | 2:33.1 | | 2. Susan Gray | USA | 2:34.2 | | 3. Beth Whitthall | CAN | 2:41.7 | | 4. Ana Maria Schultz | ARG | 2:43.5 | | 5. A. Smith | MEX | 2:50.2 | | 6. Vergara | BRA | 2:51.4 | | 7. Navarrette | CUB | 3:00.6 |
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| Heat 2 | time | L | | 1. Liliana Gonzalias | ARG | 2:34.2 | | 2. Wanda Werner | USA | 2:37.1 | | 3. Gladys Priestley | CAN | 2:37.6 | | 4. Elleen Holt | ARG | 2:39.7 | | 5. P.L. Barrow | MEX | 2:40.6 | | 6. Carol Tait | USA | 2:43.2 |
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