| | Event type
400 metres, Girls
| Date | 11 – 14 October 2018 | |
|---|---|---|
| Status | YOG | |
| Location | Athletics Field, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires | |
| Participants | 25 from 25 countries | |
| Format | Two stages with final results determined by cumulative time. | |
| Pos | Nr | Athlete | NOC | Time | Stage One | Stage Two | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 | – | Barbora Malíková |  CZE | 1:48.86 | 54.18 (5) | 54.68 (3) | Gold | ||
| 2 | – | Marie Scheppan |  GER | 1:50.06 | 54.91 (6) | 55.15 (4) | Silver | ||
| 3 | – | Niddy Mingilishi |  ZAM | 1:50.48 | 55.16 (7) | 55.32 (5) | Bronze | ||
| 4 | – | Erica Cavalheiro |  BRA | 1:51.03 | 55.60 (8) | 55.43 (6) | |||
| 5 | – | Liefde Schoemaker |  BEL | 1:51.89 | 56.14 (11) | 55.75 (8) | |||
| 6 | – | Alina Luchshava |  BLR | 1:51.90 | 55.93 (9) | 55.97 (11) | |||
| 7 | – | Janka Molnár |  HUN | 1:51.93 | 56.00 (10) | 55.93 (10) | |||
| 8 | – | Andrea Jiménez |  ESP | 1:52.14 | 56.38 (12) | 55.76 (9) | |||
| 9 | – | Meghan Hunter |  USA | 1:52.91 | 56.83 (13) | 56.08 (12) | |||
| 10 | – | Favour Ofili |  NGR | 1:53.02 | 57.51 (17) | 55.51 (7) | |||
| 11 | – | Deshana Skeete |  GUY | 1:53.57 | 56.85 (14) | 56.72 (14) | |||
| 12 | – | Lorena Rangel |  MEX | 1:53.94 | 57.08 (15) | 56.86 (15) | |||
| 13 | – | Ola Buwaro |  GAM | 1:55.00 | 58.37 (23) | 56.63 (13) | |||
| 14 | – | Jasneet Nijjar |  CAN | 1:55.72 | 57.97 (21) | 57.75 (16) | |||
| 15 | – | Nataliya Dyshliuk |  UKR | 1:55.73 | 57.67 (19) | 58.06 (17) | |||
| 16 | – | Aleksandra Zalyubovskaya |  KAZ | 1:55.76 | 57.21 (16) | 58.55 (19) | |||
| 17 | – | Ana Costa |  POR | 1:56.30 | 57.58 (18) | 58.72 (20) | |||
| 18 | – | Kinga Gacka |  POL | 1:56.57 | 58.30 (22) | 58.27 (18) | |||
| 19 | – | Wang You-Hsuan |  TPE | 1:57.66 | 58.45 (24) | 59.21 (21) | |||
| 20 | – | Adina Cîrciogel |  ROU | 1:57.82 | 57.76 (20) | 1:00.06 (1) | |||
| 21 | – | Serenia Ragatu |  FIJ | 2:02.92 | 1:00.95 (2) | 1:01.97 (2) | |||
| – | Daniella Deer |  JAM | – | 1:00.12 (1) | – ( | ||||
| – | Megan Moss |  BAH | – | 1:02.25 (3) | – ( | ||||
| – | Jiijo Hassan Mohamed |  SOM | – | 1:20.76 (4) | – ( | ||||
| – | Aissata Denn Conte |  GUI | – | – ( | – ( |