| Date | 11 October 2018 |
|---|---|
| Location | Natatorium, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires |
| Pos | Competitor | NOC | Time | |||
|---|---|---|---|---|---|---|
| 1 | Mona McSharry |  IRL | 25.76 | |||
| 2 | Mayuka Yamamoto |  JPN | 25.80 | |||
| 3 | Julieta Lema |  ARG | 26.02 | |||
| 4 | Nea-Amanda Heinola |  FIN | 26.08 | |||
| 5 | Elinah Phillip |  IVB | 26.22 | |||
| 6 | Maddy Moore |  BER | 26.81 | |||
| 7 | Karolina Jurczyk |  POL | 27.07 | |||
| 8 | Natalya Kritinina |  UZB | 27.13 |
