| Date | 11 October 2018 |
|---|---|
| Location | Natatorium, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires |
| Pos | Competitor | NOC | Time | |||
|---|---|---|---|---|---|---|
| 1 | Barbora Seemanová |  CZE | 25.33 | |||
| 2 | Mona McSharry |  IRL | 25.42 | |||
| 3 | Neža Klančar |  SLO | 25.47 | |||
| 4 | Kyla Leibel |  CAN | 25.77 | |||
| 5 | Abbey Webb |  AUS | 25.80 | |||
| 6 | Kalia Antoniou |  CYP | 25.95 | |||
| 7 | Julieta Lema |  ARG | 25.99 | |||
| 8 | Elinah Phillip |  IVB | 26.56 |
