Use one of the official apps (Île-de-France Mobilités, Bonjour RATP, or any other app from an official retailer*) to:
- Plan your itinerary ahead of time (line, direction and changes).
- Select your transport ticket and, whenever possible, purchase it before going to the station.
- Check timetables and traffic updates in real time before your journey.
*List of official retailers available at https://iledefrance-mobilites.fr/revendeurs-officiels