| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Sayers, Emma R (12)
|
AZNEP |
17:40.07 |
17:34.49 |
-5.58 |
| 2 |
Chavez-Varela, Isabella (12)
|
SISBA |
17:58.50 |
17:44.76 |
-13.74 |
| 3 |
Marakovic, Aliana W (12)
|
PCLO |
18:19.32 |
18:01.18 |
-18.14 |
| 4 |
Manley, Laura E (12)
|
AZOV |
18:42.34 |
18:06.55 |
-35.79 |
| 5 |
Naval, Victoria Mari D (12)
|
SISBA |
19:53.63 |
18:51.21 |
-62.42 |
| 6 |
Wilson, Hazel E (12)
|
PCCRUZ |
18:53.54 |
18:58.22 |
4.68 |
| 7 |
McCallen, Felicity A (12)
|
AZHEAT |
19:36.24 |
19:02.06 |
-34.18 |
| 8 |
Grant, Alexandra G (12)
|
PCVJO |
19:39.54 |
19:11.61 |
-27.93 |
| 9 |
Parker, Ava S (12)
|
AZOV |
19:46.44 |
19:27.45 |
-18.99 |
| 10 |
Dingeldein, Chloe A (12)
|
CCMERC |
20:01.89 |
19:31.63 |
-30.26 |
| 11 |
Ma, Allison (12)
|
PCSCSC |
19:55.27 |
19:33.93 |
-21.34 |
| 12 |
Bennett, Brooke A (11)
|
PCPLS |
19:40.40 |
19:37.15 |
-3.25 |
| 13 |
Taylor, Ava V (11)
|
PCSCSC |
19:00.19 |
19:38.94 |
38.75 |
| 14 |
Carver, Mia R (12)
|
AZOV |
19:33.38 |
19:43.08 |
9.70 |
| 15 |
Loftus, Emmy L (11)
|
PCPLS |
20:08.34 |
19:59.41 |
-8.93 |