A380 at CDG
If you need to get from Orly to Charles de Gaulle Airport (CDG), you have several options. Here are three ways to get between the two major airports in Paris:
Trains from Orly to Charles de Gaulle
Trains from Orly to CDG are called RER B trains. They are suburban trains that cut through the Paris city center. The train trip involves a tram ride at the beginning that takes passengers from Orly to the Antony RER B stop, then a rail journey to the airport.
Buses from Orly to Charles de Gaulle
Buses from Orly to Charles de Gaulle Airport are called Les Cars Air France. They are direct, efficient, and slightly faster than the RER.
Taxis from Orly to Charles de Gaulle
Taxis are an expensive way to get between Paris airports, but they are convenient and fast if there is no traffic.
Whichever way you choose to travel, make sure to allow enough time to make your connection.
Also, be sure to check whether your preferred transportation option is running on the day you need to get from Orly to Charles de Gaulle Airport. Strikes and maintenance work are common, especially on the trains.