The 2018 South American Junior Championships were held from October 17 through October 21 in Lima, Peru.
All-Around Results
| Rank | Athlete | Nation | VT | UB | BB | FX | AA |
| 1 | Ana Luiza Lima | Brazil | 13.033 | 13.250 | 12.467 | 11.767 | 50.517 |
| 2 | Christal Bezerra | Brazil | 12.167 | 13.100 | 12.833 | 11.700 | 49.800 |
| — | Julia Soares | Brazil | 12.300 | 12.900 | 12.600 | 11.867 | 49.667 |
| 3 | Brisa Carraro | Argentina | 12.267 | 12.700 | 11.167 | 12.200 | 48.334 |
| 4 | Hillary Heron | Panama | 11.800 | 13.150 | 11.767 | 11.167 | 47.884 |
| 5 | Fabiola Diaz | Peru | 11.267 | 12.900 | 11.667 | 11.667 | 47.501 |
| 6 | Alais Perea | Ecuador | 12.100 | 12.650 | 11.267 | 11.433 | 47.450 |
| 7 | Abigail Magistrati | Argentina | 10.833 | 13.100 | 12.233 | 11.000 | 47.166 |
| — | Lucia Esposito | Argentina | 12.300 | 12.600 | 11.567 | 10.567 | 47.034 |
| 8 | Martina Palamara | Chile | 11.967 | 12.250 | 10.833 | 9.900 | 44.950 |
| 9 | Maria Jose Villegas | Colombia | 11.567 | 12.250 | 10.267 | 10.433 | 44.517 |
| 10 | Paula Arevalo | Colombia | 10.667 | 11.300 | 11.333 | 10.600 | 43.900 |
| 11 | Karla Navas | Panama | 11.533 | 13.050 | 9.633 | 9.533 | 43.749 |
| 12 | Nadya Chacon | Peru | 10.667 | 11.850 | 10.000 | 10.400 | 42.917 |
| 13 | Renata Merino | Chile | 12.033 | 12.550 | 8.600 | 9.567 | 42.750 |
| 14 | Genesis Yanez | Ecuador | 10.733 | 11.950 | 9.667 | 9.900 | 42.250 |
| — | Genesis Gibson | Ecuador | 8.967 | 11.950 | 10.067 | 11.067 | 42.051 |
| — | Sofia Casella | Chile | 11.033 | 12.700 | 7.867 | 9.867 | 41.467 |
| — | Juana Prieto | Colombia | 9.633 | 10.700 | 8.367 | 10.167 | 38.867 |
| — | Luna Fernandez | Argentina | 12.567 | 12.300 | 12.000 | —— | 36.867 |
| — | Francisca Bello | Chile | 11.100 | 11.850 | 4.867 | 7.600 | 35.417 |
| — | Maria Zuñiga | Peru | —— | 12.500 | 10.800 | 10.033 | 33.333 |
| — | Daniela Jimenez | Ecuador | —— | —— | 10.067 | —— | 10.067 |
Vault Final Results
| Rank | Athlete | Nation | Average |
| 1 | Abigail Magistrati | Argentina | 13.450 |
| 2 | Hillary Heron | Panama | 13.434 |
| 3 | Ana Luiza Lima | Brazil | 13.000 |
| 4 | Christal Bezerra | Brazil | 12.950 |
| 5 | Luna Fernandez | Argentina | 12.917 |
| 6 | Fabiola Diaz | Peru | 12.667 |
| 7 | Sofia Casella | Chile | 12.300 |
| 8 | Maria Zuñiga | Peru | 11.850 |
Bars Final Results
| Rank | Athlete | Nation | Total |
| 1 | Christal Bezerra | Brazil | 12.667 |
| 2 | Abigail Magistrati | Argentina | 12.067 |
| 3 | Julia Soares | Brazil | 11.833 |
| 4 | Hillary Heron | Panama | 11.600 |
| 5 | Alais Perea | Ecuador | 11.033 |
| 6 | Fabiola Diaz | Peru | 11.033 |
| 7 | Paula Arevalo | Colombia | 10.900 |
| 8 | Luna Fernandez | Argentina | 9.933 |
Beam Final Results
| Rank | Athlete | Nation | Total |
| 1 | Fabiola Diaz | Peru | 12.767 |
| 2 | Hillary Heron | Panama | 12.167 |
| 3 | Luna Fernandez | Argentina | 12.067 |
| 4 | Julia Soares | Brazil | 11.800 |
| 5 | Ana Luiza Lima | Brazil | 11.733 |
| 6 | Brisa Carraro | Argentina | 11.600 |
| 7 | Alais Perea | Ecuador | 11.500 |
| 8 | Genesis Gibson | Ecuador | 7.967 |
Floor Final Results
| Rank | Athlete | Nation | Total |
| 1 | Julia Soares | Brazil | 13.000 |
| 2 | Ana Luiza Lima | Brazil | 12.867 |
| 3 | Lucia Esposito | Argentina | 12.567 |
| 4 | Luna Fernandez | Argentina | 12.467 |
| 5 | Hillary Heron | Panama | 12.000 |
| 6 | Martina Palamara | Chile | 11.933 |
| 7 | Alais Perea | Ecuador | 11.733 |
| 8 | Renata Merino | Chile | 11.200 |
Team Final Results
| Rank | Nation | Total |
| 1 | BRAZIL (Christal Bezerra, Ana Luiza Lima, Julia Soares) | 149.984 |
| 2 | ARGENTINA (Brisa Carraro, Lucia Esposito, Luna Fernandez, Abigail Magistrati) | 145.567 |
| 3 | PERU (Nadya Chacon, Fabiola Diaz, Maria Zuñiga) | 133.918 |
| 4 | ECUADOR (Genesis Gibson, Daniela Jimenez, Alais Perea, Genesis Yanez) | 131.751 |
| 5 | CHILE (Francisca Bello, Sofia Casella, Renata Merino, Martina Palamara) | 129.234 |
| 6 | COLOMBIA (Paula Arevalo, Juana Prieto, Maria Jose Villegas) | 127.284 |
The Gymternet 