In the presidential election, former president Sebastián Piñera received a lower-than-expected 36% of the vote, nearly 14 points ahead of senator Alejandro Guillier, who was backed by the sitting administration.

In the runoff election on 17 December 2017, Piñera surprised many by defeating Guillier with 54% of the vote, and turnout was two points higher than in the first round.

[1] Multi-seat constituencies were reestablished, replacing the previous binomial system of two seats per district, installed by the outgoing Pinochet dictatorship in 1989.

[6] Sebastián Piñera won the Chile Vamos primary with 58% of the vote while Beatriz Sánchez became the Broad Front (Frente Amplio) nominee with nearly 68%.

[14] On 6 August 2017, Political Evolution, which had supported Felipe Kast during the primaries, officially joined Piñera's campaign team.

[31] As the New Majority coalition failed to organize a primary and Guillier decided to stay as an independent, he was forced to collect thousands of signatures in order to compete.

[41] On 31 July 2017, Sánchez presented her campaign team, which included members of the Equality Party, which had supported her primary opponent, Alberto Mayol.

[63] On 11 May 2017 Goic officially registered her pre-candidacy before the Servel, accompanied by former president Eduardo Frei Ruiz-Tagle.