The cheapest way to the airport. Nothing listed is quicker.
RER B
RER B · RER B, Île-de-France Mobilités airport farePickup, hours & luggage
Boards at. Any RER B station in Paris, boarding a train signed "Aéroport Charles de Gaulle 2-TGV" — Gare du Nord and Châtelet–Les Halles both call at it
The airport ticket is EUR 14 (EUR 7 reduced), covering the RER B and any connection within two hours — but not buses, Noctilien, trams or the cable car. The ordinary EUR 2.55 metro ticket and EUR 12.30 Navigo Jour do not work here. Navigo Semaine (EUR 32.40), Navigo Mois and Paris Visite (from EUR 30.60/day) do include the airport; Navigo Liberté+ bills the full EUR 14. There is no group or family fare. The reduced fare applies to children aged 4 to 9; under 4 travel free.
Luggage. A commuter train with luggage space by the doors; no restriction, and crowded at rush hour.
Hours. Île-de-France Mobilités says a train runs every 6 to 15 minutes in both directions, 04:50 to about midnight, without giving an exact last minute this way. Some autumn 2026 evenings cut the airport-bound train short; check the departure board before counting on a late one back to the airport.