The cheapest parking at Paris Charles de Gaulle Airport
If you're arriving at the airport by car and need to park it somewhere during your absence, you have a wide range of options. You can choose covered parking, open-air parking, and the airport also caters to passengers arriving on motorcycles. Among the areas PR, PX, PH, and P3Résa, you can get closer to the terminals using CDGVAL, and the PW parking lot is connected to the airport by shuttle service. Another option is cheaper private parking lots, where you can compare prices through the Parkvia website.
You can view the parking map and descriptions of individual areas here.
Short-term Parking "Kiss and Fly"
If you are picking up or dropping off passengers at the airport, you have 10 minutes of free parking in the Drop Off zones and Drop-off "Départ minute" T2E. At the Drop-off "Arrivée minute" T2E parking lot, you can stop for free for up to half an hour. More information and the price list for exceeding the free parking time can be found here.
Long-term Parking
If you plan to park for an extended period (several days), it's worth parking in areas marked EKO. They may not be right at the terminal entrance, but you can get closer by shuttle service, and the savings are definitely worth it.