Paris Gare de Lyon

Paris Gare de Lyon is located in the 12th district of Paris, trains serve not only some French cities (like Lyon, Grenoble, Montpellier, Dijon, Aix-en-Provence, Toulon, Nice...), but also European cities (trains go to Italy, Switzerland, Spain). You have also the transilien network (between Paris and its suburbs) which goes through Paris gare de Lyon towards Montargis (south-est of Paris, Loiret Department) by the transilien line R.

How to go to Paris Gare de Lyon train station from Charles de gaulle airport or Orly airport?
*The Cars Air France line 4 goes from/to the Charles de Gaulle airport (terminus 1 and 2) to/from Gare Montparnasse train station by Paris gare de Lyon. The line 4 runs every 30 minutes. The cost is 16.5€ one way, 27€ round trip and 8€ for children (2 to 11 years old).
*You can take the metro or RER, it will be cheaper however you will have some connections to do.

Connections between Paris Gare de Lyon train station and subway and train?
The subways line 1 (Chateau de vincennes<---> la Défense) and line 14 (Saint-Lazare <--->Olympiades) go by the Gare de Lyon (Gare de Lyon station).

You can catch the RER (lines A and D), both have a station close to the gare (Gare de Lyon station).
For the RER A (for one way), the week-end you have 12 trains per hour, and for the week from 18 to 30 trains depending on rush hours. For the evening, you have around 8 trains per hour.
For the RER D (for one way), the week until saturday it reaches 12 to 16 trains (per hour) in rush hours, and least half in off-peak hours. On sunday and evening until 4 trains per hour.

As well as some bus line. 

Some specials bus like Balabus (from la Défense to Paris Gare de Lyon and only the sunday afternoon from April to September), Paris l'Open Tour, you have also some Noctilien bus (bus by night)

What ticket can I use to go to Paris Gare de Lyon train station?
With the metro, a single ticket t+ (1.70€) is sufficient.
The Gare de Lyon is located in zone 1 of Paris, so the rate is depending on your pass, the place you are coming from, the transportation you use.

Opening hours
The Paris Gare de Lyon is equipped with wireless connections (wifi) and is opened every day (even for holidays days) from 4h45am to 1:30am.