From Belgium
As according to an agreement with the CFL, the Belgian railways are directing all passenger trains to France through Luxembourg thus causing an extra unnecessary border crossing, it may be useful to cross the border directly, on foot. The terminus of the French railways in Longwy can be reached from the Belgian train station of Halanzy the line operates only on work days, however, or from the bigger Belgian stations of Arlon or Virton. Between these two stations there's a bus operated by the TEC company which stops at Aubange Place, a good point of departure/arrival for the walking tour. The path leads almost exclusively through inhabited areas in the community of Mont-Saint-Martin yet partially in a forest if you go to/from Halanzy and takes some 7 km. The city of Longwy itself is quite steep in some of its parts, so pay attention to this when planning your route.
There are domestic Belgian trains that terminate in Lille station Lille-Flanders.
Between the De Panne terminus of the Belgian railways and the Coast tram – Kusttram and the French coastal city of Dunkerque, there is a bus line run by DK'BUS Marine: (http://www.dkbus.com/). It may, however, be operating only in certain time of the year. It is also possible to take a DK'BUS bus which goes to the closest possible distance of the border and then cross it on foot by walking on the beach and arriving at a convenient station of the Coast tram, such as Esplanade.
By plane
The main international airport, Roissy - Charles de Gaulle IATA: CDG, (http://www.easycdg.com), is likely to be your port of entry if you fly into France from outside Europe. CDG is the home of Air France AF, the national company, for most intercontinental flights. AF and the companies forming the SkyTeam Alliance Dutch KLM, AeroMexico, Alitalia, Delta Air Lines, Korean Air use Terminal 2 while most other foreign airlines use Terminal 1. A third terminal is used for charter flights. If transferring through CDG especially between the various terminals it is important to leave substantial time between flights. Ensure you have no less than one hour between transfers. Add more if you have to change terminals as you will need to clear through security.
Transfers to another flight in France: AF operates domestic flights from CDG too, but a lot of domestic flights, and also some internal European flights, use Orly, the second Paris airport. For transfers within CDG you can use the free bus shuttle linking all terminals, train station, parking lots and hotels on the platform. For transfers to Orly there is a bus link operated by AF free for AF passengers. The two airports are also linked by a local train RER which is slightly less expensive, runs faster but is much more cumbersome to use with heavy luggage. AF has agreements with the SNCF, the national rail company, which operates TGVs see below out of CDG airports some trains carry flight numbers. The TGV station is in Terminal 2 and is on the route of the free shuttle. For transfers to the city centre of Paris, see Paris. Paris Star Shuttle (http://www.paristarshuttl...) offers transfers from CDG into Paris.
Some low-cost airlines, including Ryanair and Volare, fly to Beauvais airport situated about 80 km northwest of Paris. Buses to Paris are provided by the airlines. Check schedules and fares on their websites.