RATP is your ticket to Paris and the Ile-de-France region. Weekdays, the metro operates from 5:30 a.m. to about 1:15 a.m. On Friday and Saturday evenings, as well as on the day before a bank holiday, trains run until about 2:15 a.m. The RER operates daily from 5:30 a.m. to about 1:20 a.m.