Charles de Gaulle Airport has three terminals: Terminal 1 is the oldest and situated opposite to Terminal 3; Terminal 2 is located at another side with 7 sub-terminal buildings (2A to 2G).

Paris Charles de Gaulle Airport (CDG) is one of the largest and most complex aviation hubs in the world, currently organized into three primary terminal complexes: Terminal 1, Terminal 2, and Terminal 3. Terminal 1 is the iconic circular building known for its avant-garde "octopus" design and glass skywalks. Terminal 2 is by far the largest and most sprawling, divided into seven distinct sub-terminals (2A, 2B, 2C, 2D, 2E, 2F, and 2G). Terminal 2E and 2F are the primary hubs for Air France and SkyTeam partners, featuring massive satellite concourses known as Halls K, L, and M. Terminal 3 is a separate, more functional facility primarily used by low-cost and charter airlines. Navigating between these terminals is facilitated by the CDGVAL, a free automated light rail system that connects all terminals, the long-term parking lots, and the RER/TGV train stations. It is important for travelers to check their specific sub-terminal letter in Terminal 2, as walking between 2A and 2G, for example, is not possible; a shuttle bus is required for 2G as it is located away from the main complex. The airport’s immense size means that transferring between terminals can take anywhere from 10 to 30 minutes.