| Final A | Team | time | -)time | L | React. | 100m | 200m | 300m | | 1. Gillian Rene Ryan | USA | 4:11.58 | | 3 | | 4. | 1:01.99 | 4. | 2:06.31 | 4. | 3:10.45 | | 2. Andreina Pinto | VEN | 4:11.81 | 0.23s | 4 | | 1. | 1:01.55 | 2. | 2:05.66 | 2. | 3:09.80 | | 3. Kristel Kobrich | CHI | 4:13.31 | 1.73s | 5 | | 2. | 1:01.78 | 1. | 2:05.26 | 1. | 3:09.25 | | 4. Joanna Maranhao | --- | 4:13.71 | 2.13s | 7 | 0.79s | 7. | 1:02.71 | 5. | 2:06.45 | 3. | 3:10.24 | | 5. Cecilia Biagioli | --- | 4:15.41 | 3.83s | 2 | 0.85s | 3. | 1:01.87 | 3. | 2:06.07 | 5. | 3:10.71 | | 6. Patricia Castaneda | --- | 4:17.20 | 5.62s | 6 | | 6. | 1:02.57 | 6. | 2:07.25 | 6. | 3:12.00 | | 7. Susana Escobar | --- | 4:17.55 | 5.97s | 8 | | 8. | 1:03.08 | 8. | 2:07.97 | 7. | 3:12.67 | | 8. Ashley Steenvoorden | --- | 4:20.51 | 8.93s | 1 | | 5. | 1:02.03 | 7. | 2:07.49 | 8. | 3:14.13 |
| Final B | Team | time | -)time | L | React. | 100m | 200m | 300m | | 9. Sherry Liu | --- | 4:18.11 | | 2 | | 1. | 1:02.81 | 1. | 2:08.79 | 1. | 3:14.43 | | 10.Yanel Pinto | --- | 4:20.13 | 2.02s | 4 | 0.71s | 4. | 1:03.50 | 2. | 2:10.11 | 2. | 3:16.45 | | 11.Alexia Benitez | --- | 4:23.53 | 5.42s | 6 | 0.88s | 6. | 1:04.72 | 6. | 2:11.75 | 4. | 3:18.76 | | 12.Bridget Coley | --- | 4:26.36 | 8.25s | 3 | | 5. | 1:03.95 | 3. | 2:10.12 | 3. | 3:18.40 | | 13.Andrea Cedron | --- | 4:26.76 | 8.65s | 1 | | 3. | 1:03.43 | 4. | 2:10.71 | 5. | 3:19.08 | | 14.Virginia Bardach | --- | 4:27.31 | 9.20s | 7 | | 2. | 1:03.08 | 5. | 2:11.02 | 6. | 3:19.19 | | 15.Manuella Lyrio | --- | 4:29.93 | 11.82 | 5 | | 7. | 1:05.25 | 7. | 2:13.65 | 7. | 3:21.89 |
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| World record: | | Pan American Games record: |
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| Qualification: | | Standard A: 4:19.9 | | Standard B: 4:27.7 |
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| Heats | Team | time | -)time | L | React. | 100m | 200m | 300m | Heat | | 1. Andreina Pinto | VEN | 4:16.12 | | 4 | | 1. | 1:02.20 | 1. | 2:06.74 | 1. | 3:11.58 | Heat 2. | | 2. Kristel Kobrich | CHI | 4:16.23 | 0.11s | 5 | | 1. | 1:03.25 | 1. | 2:07.56 | 1. | 3:11.90 | Heat 3. | | 3. Gillian Rene Ryan | USA | 4:16.51 | 0.39s | 4 | | 3. | 1:02.39 | 3. | 2:07.73 | 3. | 3:12.99 | Heat 1. | | 4. Patricia Castaneda | --- | 4:16.91 | 0.79s | 5 | | 5. | 1:03.03 | 4. | 2:07.93 | 2. | 3:12.78 | Heat 1. | | 5. Cecilia Biagioli | --- | 4:16.96 | 0.84s | 6 | 0.88s | 1. | 1:02.27 | 1. | 2:07.39 | 1. | 3:12.55 | Heat 1. | | 6. Joanna Maranhao | --- | 4:18.85 | 2.73s | 3 | | 2. | 1:02.33 | 2. | 2:07.68 | 4. | 3:13.09 | Heat 1. | | 7. Ashley Steenvoorden | --- | 4:19.16 | 3.04s | 4 | | 2. | 1:03.52 | 2. | 2:08.74 | 2. | 3:14.10 | Heat 3. | | 8. Susana Escobar | --- | 4:20.16 | 4.04s | 5 | | 2. | 1:02.92 | 2. | 2:07.90 | 2. | 3:13.47 | Heat 2. | | 9. Yanel Pinto | --- | 4:22.56 | 6.44s | 2 | 0.71s | 4. | 1:03.94 | 4. | 2:10.77 | 3. | 3:17.73 | Heat 3. | | 10.Manuella Lyrio | --- | 4:22.97 | 6.85s | 2 | | 5. | 1:03.72 | 5. | 2:10.16 | 4. | 3:17.13 | Heat 2. | | 11.Bridget Coley | --- | 4:23.04 | 6.92s | 6 | 0.79s | 4. | 1:03.56 | 4. | 2:09.94 | 3. | 3:17.01 | Heat 2. | | 12.Samantha Arevalo | --- | 4:24.81 | 8.69s | 2 | | 4. | 1:02.72 | 5. | 2:09.02 | 5. | 3:17.00 | Heat 1. | | 13.Alexia Benitez | --- | 4:26.05 | 9.93s | 3 | | 3. | 1:03.56 | 3. | 2:10.26 | 4. | 3:18.07 | Heat 3. | | 14.Sherry Liu | --- | 4:26.80 | 10.68s | 3 | | 3. | 1:03.14 | 3. | 2:09.81 | 5. | 3:18.45 | Heat 2. | | 15.Virginia Bardach | --- | 4:30.23 | 14.11s | 6 | 0.86s | 5. | 1:04.25 | 5. | 2:12.15 | 5. | 3:20.97 | Heat 3. | | 16.Andrea Cedron | --- | 4:33.75 | 17.63s | 7 | | 6. | 1:05.07 | 6. | 2:13.80 | 6. | 3:23.73 | Heat 3. | | 17.Britany Van Lange | --- | 4:57.58 | 41.46s | 7 | | 6. | 1:07.22 | 6. | 2:22.44 | 6. | 3:40.08 | Heat 2. |
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