[3] The metro was projected to be operational by August 2020,[4] but the opening was delayed numerous times.

The official inauguration was held on 21 December 2022,[5] and commercial service started with some tests with passengers on 2 May 2023.

[7] Later that year, the Quito metro initiated its commercial operations on 1 December 2023.

[3] Due to archaeological remains found at the proposed site of the San Francisco station in late 2016, the station was moved two blocks further south to the Plaza 24th of May, and the remains will not be disturbed further.

[10] The design of Line 1 allows for five infill stations to be built if demand warrants, and for a potential 5 km extension northwards to the Ofelia bus terminal.