Paris has one of the best urban transit systems in the world. The Métro and RER together cover the entire city with stations rarely more than ten minutes' walk from any point. A single t+ ticket costs €2.15 (buy a carnet of 10 for better value, or load a Navigo Liberté+ card). The t+ ticket is valid for one journey on the Métro, one bus journey, or one tram journey — you cannot transfer between bus and Métro on the same ticket.
The RER (Réseau Express Régional) runs express trains through central Paris and out to the suburbs. Within central Paris (Zones 1–2) it is included in the standard Métro ticket. The RER B goes to CDG Airport; the RER C goes to Versailles (45 minutes, €7.30).
Bus routes cover the whole city and are particularly useful for enjoying Paris at street level. The RATP app shows real-time departures. The Noctilien night bus network operates after Métro closure (approximately 1am on weekdays, 2:15am on weekends).
Walking is almost always better than it looks on the map. Paris is a compact city and many iconic sites are within 20–30 minutes' walk of each other. The stretch from the Louvre along the Seine to the Musée d'Orsay, for instance, is one of the great urban walks in Europe.
Vélib' is the bike-share scheme with 1,400 stations across the city. Short journeys are cheap and the protected cycle lane network has expanded significantly since the post-2015 infrastructure investment. Traffic on main roads remains aggressive; stick to the pistes cyclables where possible.
Taxis and Uber are plentiful but expensive relative to transit. Fixed-rate fares apply from the airports. In central Paris, unless you have heavy luggage, the Métro is almost always faster.
Driving in Paris is not recommended. One-way streets, difficult parking, and Parisian driving styles make it an experience best reserved for masochists.