| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Barone, Adrianna M (14)
|
FGPCS |
19:03.14 |
18:10.87 |
-52.27 |
| 2 |
Hew, Lauren E (17)
|
FGSAS |
17:59.99 |
18:13.80 |
13.81 |
| 3 |
Fetes, Shayna A (16)
|
FGSAS |
18:22.19 |
18:28.58 |
6.39 |
| 4 |
Miller, Lucia C (13)
|
FGSAS |
19:00.99 |
18:43.62 |
-17.37 |
| 5 |
Trieschmann, Hannah C (17)
|
FGSAS |
18:29.26 |
18:52.30 |
23.04 |
| 6 |
Beleznay, Flora (13)
|
FGPCS |
19:03.83 |
18:58.72 |
-5.11 |
| 7 |
Torres, Sydney C (15)
|
FGSAS |
19:26.07 |
19:29.56 |
3.49 |
| 8 |
Mullen, Marin E (18)
|
FGSAS |
19:37.01 |
19:35.25 |
-1.76 |
| 9 |
Beltrano, Gabriella J (14)
|
FGSAS |
19:01.11 |
19:37.37 |
36.26 |
| 10 |
Mackler, Danni R (16)
|
FGSAS |
20:07.10 |
19:52.88 |
-14.22 |
| 11 |
Zlateva, Victoria A (13)
|
FGPCS |
19:34.26 |
20:00.02 |
25.76 |
| 12 |
Amorim, Beatriz A (13)
|
FGBMSC |
|
20:00.56 |
- |
| 13 |
Szakacs, Lydia C (14)
|
FGSAS |
19:46.58 |
20:08.00 |
21.42 |
| 14 |
Najarro, Lejla (14)
|
FGPCS |
19:29.48 |
20:10.56 |
41.08 |
| 15 |
Gomez, Emma C (13)
|
FGPCS |
19:31.01 |
20:20.41 |
49.40 |
| 16 |
Nordheim, Caroline K (14)
|
FGSAS |
19:30.99 |
20:27.90 |
56.91 |
| 17 |
Seniuta, Monika (13)
|
FGSAS |
19:50.99 |
21:15.20 |
84.21 |
| 18 |
Brady, Alyson D (16)
|
FGSAS |
|
21:41.63 |
- |
| 19 |
Sare, Ema G (13)
|
FGSAS |
|
22:22.65 |
- |