In June 2015 he was appointed technical director of the Chile women's national football team, with his first task to prepare an under 20 team for the 2015 South American U-20 Women's Championship. When the senior women's national team played their first fixture in three years in May 2017, they thrashed hapless Peru 12–0. At the 2018 Copa América Femenina, Letelier steered hosts Chile to a runners-up finish, securing qualification to their first ever FIFA Women's World Cup in 2019.