| Date | 7 October 2018 |
|---|---|
| Location | Natatorium, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires |
| Pos | Competitor | NOC | Time | |||
|---|---|---|---|---|---|---|
| 1 | Miku Kojima |  JPN | 2:15.37 | |||
| 2 | Neža Klančar |  SLO | 2:15.94 | |||
| 3 | Kate Douglass |  USA | 2:16.47 | |||
| 4 | Kaylee McKeown |  AUS | 2:17.03 | |||
| 5 | Nikol Pavlopoulou |  GRE | 2:17.35 | |||
| 6 | Alba Vázquez |  ESP | 2:17.54 | |||
| 7 | Nea-Amanda Heinola |  FIN | 2:19.01 | |||
| 8 | Mariella Venter |  RSA | 2:27.89 |
