| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Trinidad, Mianny (17)
|
MRRED |
1:06.14 |
1:05.69 |
-0.45 |
| 2 |
Wright, Ellen J (16)
|
MRRED |
1:09.53 |
1:08.33 |
-1.20 |
| 3 |
McKinney, Emilia W (15)
|
MRCIY |
1:14.33 |
1:12.66 |
-1.67 |
| 4 |
Lin, Wenxi (16)
|
MRCIY |
1:10.99 |
1:12.78 |
1.79 |
| 5 |
Minchala, Lesly Y (18)
|
MRFLY |
1:13.54 |
1:12.80 |
-0.74 |
| 6 |
Soulantzos, Josephine M (15)
|
MRFLY |
|
1:14.50 |
- |
| 7 |
Sandoval, Joselyn (15)
|
MRRED |
1:15.28 |
1:15.48 |
0.20 |
| 8 |
Heerey, Karolina A (15)
|
MRCIY |
1:14.01 |
1:15.66 |
1.65 |
| 9 |
Ng, Tiffany (17)
|
MRCIY |
1:16.98 |
1:29.37 |
12.39 |
| 10 |
Rojas, Denisse (16)
|
MRFLY |
|
1:34.02 |
- |
| 11 |
Arcentales, Daffnia J (16)
|
MRFLY |
|
1:38.99 |
- |
| 12 |
Zhong, Runjia (15)
|
MRFLY |
|
1:54.83 |
- |