Round 1
| Position | BIB | Name | Team | Echelon | Mark | 
|---|---|---|---|---|---|
| 1 | 174 | Ema Ramires |  QFC | SUB-14 | 18:48.16 (~)   | 
| 2 | 572 | Daniela Delgado |  GDRV | SUB-14 | 19:52.00   | 
| 3 | 578 | Rita Damásio |  GDRV | SUB-12 | 21:14.32 (~<)   | 
| 4 | 219 | Inês Bate |  QFC | SUB-12 | 21:42.43 (~) | 
| 5 | 175 | Sara Silva |  QFC | SUB-14 | 22:11.83 | 
| 6 | 203 | Mia Lourenço Ramires |  QFC | SUB-12 | 22:54.19 | 
| 7 | 713 | Larissa Gomes |  GDRV | SUB-14 | 25:12.44 |