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• The Paris public transport system is run by RATP and consists of the Métro (underground), Tram, RER suburban express train (which interconnects with the Métro inside Paris), bus and Noctilien (night bus). Paris and its surburbs divide into 6 zones.
• Zones 1 and 2 cover the city center and ALL Métro lines. RATP tickets and passes are valid on the Métro, tram, buses and RER. The Métro alone is very efficient and will take you anywhere you need to go within Paris city limits, and sometines slightly beyond. Buses are less reliable but still offer a good service. Smoking is not allowed.


• On the bus, transfers (bus/bus or bus/tram) are also permitted for up to 1 hour 30 minutes (from first to last check-in). Between 1 a.m. and 5.30 a.m., while the Métro is closed, Noctambus lines may be used 7 days a week. A special fare will apply. 

Buses, ​including the 'Noctilien' night buses, in Paris are run by state-owned transport operator RATP (Régie Autonome des Transports Parisiens).  
Paris buses run Monday to Saturday from 7am until 8.30pm. There are some services operating in the evenings  between 8.30pm and 12.30am serving the main staions and airports of the city.The company offer a reduced service on Sundays and public holidays.  The city has 64 bus routes  which complement the metro network above ground.
The public transport system in the city of Paris is run by state-owned transport operator RATP and includes the Métro system (underground), Trams, RER suburban trains (which link with the Métro inside Paris) and buses including the 'Noctilien' night buses. Paris and its surburbs divide into 6 zones.