| Final 20:23 | | time | | L | birth | | 1. Martina Weil |  Chile | 51.48s | | 6 | 12.07.99 | | 2. Nicole Caicedo |  Ecuador | 51.76s | | 8 | 02.09.00 | | 3. Evelis Jazmin Aguilar |  Colombia | 51.95s | | 5 | 03.01.93 | | 4. Grace Konrad |  Canada | 52.10s | | 7 | 16.08.99 | | 5. Aliyah Abrahams |  Guyana | 52.66s | | 4 | 03.04.97 | | 6. Tiffani Beatriz Domingos |  Brazil | 52.81s | PB | 2 | 06.05.99 | | 7. Madeline Price | Canada | 53.59s | | 3 | 11.09.95 | | -. Tabata Vitorino | Brazil | DNS | | | 23.04.96 |
| 10 competitors from 8 nations. Venue: Julio MartÃnez National Stadium. |
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| World Record: Marita Koch, East Germany 47.60s Canberra, Australia 6th October 1985 | | America Record: Shaunae Miller-Uibo, Bahamas 48.36s Tokyo, Japan 6th August 2021 | | PanAmerican Games Record: Ana Quirot, Cuba 49.61s La Habana, Cuba 5th August 1991 1979 |
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Heats - Monday, 30th October 17:50 | | First 3 from each Heat and Best 2 times advanced to Final. |
| Heat 1 | | time | | L | | 1. Martina Weil | Chile | 51.47s | Q | 7 | | 2. Aliyah Abrahams | Guyana | 51.82s | Q | 5 | | 3. Nicole Caicedo | Ecuador | 52.32s | Q | 4 | | 4. Madeline Price | Canada | 52.70s | q | 3 | | 5. Tiffani Beatriz Domingos | Brazil | 52.83s | q, PB | 6 |
| Heat 2 | | time | | L | | 6. Evelis Jazmin Aguilar | Colombia | 53.64s | Q | 4 | | 7. Grace Konrad | Canada | 53.64s | Q | 7 | | 8. Tabata Vitorino | Brazil | 55.57s | | 6 | | -. Anabel Medina |  Dominicana | TR 16.8 | DQ | 5 | | -. Roxana Gomez |  Cuba | DNS | | 3 |
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Prepared and maintained by Todor Krastev
todor1966@yahoo.com
Last updated: 6 Nov 2023
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