These are the full results of the 2018 South American Under-23 Championships in Athletics which took place between September 29 and 30 at Pista de Atletismo Jefferson Pérez in Cuenca, Ecuador.
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September 29 September 30 September 29 September 30 September 29 September 29Wind: +1.2 m/s September 30 September 30 September 29 September 30 September 29 September 29 September 30 September 29 September 30 September 29 September 30 September 29 September 30 September 29–30
September 29 September 30 September 29 September 30 September 29 September 29Wind: -1.4 m/s September 30 September 30 September 29 September 30 September 29 September 30 September 29 September 30 September 29 September 30 September 29 September 30 September 29 September 29–30