| Date | 7 October 2018 — 18:00 |
|---|---|
| Location | Natatorium, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires |
| Pos | Competitor | NOC | Time | |||
|---|---|---|---|---|---|---|
| 1 | Kristóf Milák |  HUN | 3:48.08 | |||
| 2 | Marco De Tullio |  ITA | 3:48.55 | |||
| 3 | Keisuke Yoshida |  JPN | 3:48.68 | |||
| 4 | Nguyễn Huy Hoàng |  VIE | 3:48.85 | |||
| 5 | Ákos Kalmár | HUN | 3:51.56 | |||
| 6 | Denis Loktev |  ISR | 3:52.12 | |||
| 7 | Antonio Djakovic |  SUI | 3:53.74 | |||
| 8 | Ahmed Hafnaoui |  TUN | 3:55.94 |
