Arriving in Destination
Charles de Gaulle Airport Trains (RER), buses and night buses to the city centre €6 to €18; taxi €50 to €55, 15% higher evenings and Sundays.
Orly Airport Trains (Orlyval then RER), buses and night buses to the city centre €8.70 to €13.25; T7 tram to Villejuif–Louis Aragon then metro to centre (€3.80); taxi €30 to €35, 15% higher evenings and Sundays.
Beauvais Airport Buses (€17) to Porte Maillot then metro (€1.90); taxi during the day/night around €170/210 (probably more than the cost of your flight!).
Gare du Nord train station Within central Paris; served by metro (€1.90).