On December 31st (New Year’s Eve), certain Paris Metro & RER lines stay open and operational all night long.
Paris Metro lines operating all night: 1, 2, 4, 6, 9 et 14 the evening of New Year’s eve.
Paris RER lines operating all night: RER A and RER B the night of 31 December.
Paris Noctilien (night bus) will operate as per normal.
All Paris Metro, Buses, RER, Trams will operate free of charge from 17h (5pm) on Dec. 31 until 12:00 noon January 1.
Please keep in mind that not all Metro stations along the above noted lines will be served during the extended service hours, rather only the more popular stations and stations with connections to other lines.
Paris Metro & RER lines not mentioned above will operate as per normal with service ending at 01:40 for the Metro. For more information RER hours of operation see the Schedules page.
(Thanks to Didier Rouger of RATP for some of the above information).