| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 57.29 | 2025 Canada West Swimming Championship | 2025-11-28 |
| 100m Freestyle | 54.09 | Blue Gold Time Trial 1 | 2025-11-22 |
| 1500m Freestyle | 15.48 | UBC University Cup Pacific 2025 | 2025-11-08 |
| 200m Backstroke | 2:01.07 | 2026 U SPORTS Swimming Championships | 2026-03-12 |
| 200m Freestyle | 1:53.44 | 2026 U SPORTS Swimming Championships | 2026-03-12 |
| 200m IM | 2:09.63 | UVic - SFU Dual Meet | 2026-01-31 |
| 400m Freestyle | 3:59.59 | 2026 U SPORTS Swimming Championships | 2026-03-12 |
| 50m Backstroke | 27.32 | Blue Gold Time Trial 3 | 2026-02-25 |
Mylonas, Demetrios's top personal bests include 100m Backstroke (57.29), 100m Freestyle (54.09), 1500m Freestyle (15.48), 200m Backstroke (2:01.07), 200m Freestyle (1:53.44).
Mylonas, Demetrios swims for University of Victoria.
Mylonas, Demetrios has competed in 8 meets.