| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:00.75 | UBC Winter Warm-Up 2026 | 2026-01-17 |
| 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 | 16:35.37 | 2025 Canada West Swimming Championship | 2025-11-28 |
| 200m Backstroke | 2:11.59 | UBC Winter Warm-Up 2026 | 2026-01-17 |
| 200m Backstroke | 2:01.07 | 2026 U SPORTS Swimming Championships | 2026-03-12 |
| 200m Freestyle | 1:59.91 | UBC Winter Warm-Up 2026 | 2026-01-17 |
| 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 |
Demetrios Mylonas's top personal bests include 100m Backstroke (1:00.75), 100m Backstroke (57.29), 100m Freestyle (54.09), 1500m Freestyle (16:35.37), 200m Backstroke (2:11.59).
Demetrios Mylonas swims for University of Victoria.
Demetrios Mylonas has competed in 8 meets.