Paris is served by two Airports - Orly in the South and Roissy/Charles de Gaulle in the North. Most American flights arrive at Roissy airport, and internal French flights mostly arrive at Orly. Both Orly and Roissy have extensive international airline facilities including duty-free shops, car rental, restaurants, hotels, post offices, and ground transport into the city center.

Flying time to Paris from the United States is about 7 hours from New York or Washington D.C., 8 hours from Atlanta or Miami, 9 hours from Chicago, and 11 hours from Los Angeles. Air France has more connections into Paris from European capitals than any other airline and flying time is approximately one hour. Here are some airlines that fly to and from Paris:
Air France - www.airfrance.com
British Airways - www.britishairways.com
Aer lingus  - www.aerlingus.ie
KLM - www.klm.nl

On Arrival at Charles de Gaulle Airport
23 km north east of Paris near the village of Roissy-en-France is Charles de Gaulle airport. The largest airport serving Paris, it has two terminals, the second of which is split into terminals 2A, 2B, 2C, and 2D.
There are excellent public transport services from Charles de Gaulle airport directly into Paris. Taxis are best avoided as they can be very expensive and usually get stuck in traffic jams. You can take the Train  - the RER B, which takes approximately 40 minutes to/from the city. Another option is the Roissy Bus, an Airport bus serving all terminals which goes directly into the Opera district in Central Paris. It runs every 15 minutes and costs EU 8 for a single fare. The Air France Airport Bus leaves every 15 Minutes (6am-11pm) and takes just 40 minutes to get you into the central Arc de Triomphe (Etoile) or nearby Porte maillot .

On arrival at Orly Airport
Located just 14 kilometres south of Paris is Orly Airport. It has two terminals refered to as Orly-Sud (Orly South) and Orly-Ouest (Orly West). Orly is easily accessible by taxi, but again has similar choices of public transport as offered by Charles de Gaulle Airport. The Orlybus, which arrives at the RER and metro station Denfert-Rochereau in South Paris, is quite reasonable and fast. You can also take the RER B, called Orlyval, but the shuttle connection is not as well organized as at Charles de Gaulle. The Air France bus (departures every 12 minutes ) goes to Invalides but will drop you off, if requested, at Porte d’Orleans or Duroc Metro. Allow 30 minutes. Taxis usually await the Bus, and the metro station is usually a few yards away. On, leaving pick it up again at Etoile.