| | Event type
400 metres Hurdles, Girls
| Date | 13 – 16 October 2018 | |
|---|---|---|
| Status | YOG | |
| Location | Athletics Field, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires | |
| Participants | 19 from 19 countries | |
| Format | Two stages with final results determined by cumulative time. | |
| Pos | Nr | Athlete | NOC | Time | Stage One | Stage Two | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | – | Valeria Cabezas |  COL | 1:57.58 | 59.19 (1) | 58.39 (1) | Gold | ||
| 2 | – | Loubna Benhadja |  ALG | 2:00.68 | 1:00.98 (6) | 59.70 (2) | Silver | ||
| 3 | – | Carla García |  ESP | 2:00.76 | 1:00.84 (3) | 59.92 (5) | Bronze | ||
| 4 | – | Julia Lovsin |  CAN | 2:00.84 | 1:00.95 (5) | 59.89 (3) | |||
| 5 | – | Emma Silvestri |  ITA | 2:01.50 | 1:00.88 (4) | 1:00.62 (7) | |||
| 6 | – | Yara Amador |  MEX | 2:01.54 | 1:01.63 (8) | 59.91 (4) | |||
| 7 | – | Gisèle Wender |  GER | 2:02.18 | 1:01.16 (7) | 1:01.02 (8) | |||
| 8 | – | Kristýna Korelová |  CZE | 2:02.97 | 1:01.84 (9) | 1:01.13 (10) | |||
| 9 | – | Lena Pressler |  AUT | 2:03.18 | 1:01.85 (10) | 1:01.33 (11) | |||
| 10 | – | Yang Jui-Hsuan |  TPE | 2:03.69 | 1:02.65 (12) | 1:01.04 (9) | |||
| 11 | – | Gontse Morake |  RSA | 2:04.30 | 1:04.35 (15) | 59.95 (6) | |||
| 12 | – | Vishnu Jayaprakasan |  IND | 2:04.48 | 1:02.56 (11) | 1:01.92 (12) | |||
| 13 | – | Miriam Daly |  IRL | 2:04.87 | 1:02.72 (13) | 1:02.15 (13) | |||
| 14 | – | Jéssica Moreira |  BRA | 2:05.54 | 59.41 (2) | 1:06.13 (15) | |||
| 15 | – | Ariana Durand |  NCA | 2:11.75 | 1:05.72 (16) | 1:06.03 (14) | |||
| 16 | – | Evedieu Samba |  CGO | 2:18.78 | 1:10.63 (18) | 1:08.15 (16) | |||
| 17 | – | Phailin Khonepaseuth |  LAO | 2:19.17 | 1:09.68 (17) | 1:09.49 (18) | |||
| 18 | – | Aminata Kaboré |  BUR | 2:20.31 | 1:12.05 (19) | 1:08.26 (17) | |||
| – | Kia Laisi |  FIN | – | 1:03.23 (14) | – ( |