Getting around by metro and RER
With nearly 400 stations, the Paris metro is one of the main and more practical transportation.
By subway, you can travel quickly to central Paris. Once you cross the ring road (the highway that surrounds Paris), you can take the RER for destinations within Ile-de-France (Disneyland Paris or Versailles, for example)
The metro trains run from 5.30 a.m. to 1.15 a.m. and until 2.15 a.m. on Fridays, Saturdays and eve of holidays. The RER runs from 6 a.m. to 12.30 a.m.
Rates are increasing depending on your travel zones (from 1 to 5).
You can also buy day passes: