| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Butterfly | 1:18.41 | Marianne Limpert Team Championship | 2026-02-05 |
| 100m Freestyle | 1:10.61 | Marianne Limpert Team Championship | 2026-02-05 |
| 100m IM | 1:20.85 | Premier 1 Sharknado 2025 | 2025-11-02 |
| 200m Freestyle | 2:52.48 | Premier 1 Sharknado 2025 | 2025-11-02 |
| 200m IM | 2:52.68 | Marianne Limpert Team Championship | 2026-02-05 |
| 50m Backstroke | 37.51 | Marianne Limpert Team Championship | 2026-02-05 |
| 50m Butterfly | 34.22 | Marianne Limpert Team Championship | 2026-02-05 |
| 50m Butterfly | 36.39 | Premier 1 Sharknado 2025 | 2025-11-02 |
| 50m Freestyle | 30.51 | Marianne Limpert Team Championship | 2026-02-05 |
| 50m Freestyle | 30.77 | Premier 1 Sharknado 2025 | 2025-11-02 |
Langseth, Dylan John's top personal bests include 100m Butterfly (1:18.41), 100m Freestyle (1:10.61), 100m IM (1:20.85), 200m Freestyle (2:52.48), 200m IM (2:52.68).
Langseth, Dylan John swims for Saint John Fundy Aquatic Club.
Langseth, Dylan John has competed in 2 meets.