Lille Flights

From Paris, Bruxelle or London, the easiest way is the train : Bruxelles is 30 minutes, London 2 hours and Paris 1 hour.
Walking in the centre

From London, the Eurostar from Waterloo Station. Fares start at £79 return or even sometimes as low as £40 return during promotional periods.
I walked and walked and walked. The city center is within walking distance of the Eurostar station.

The best way to get to Lille is probably by train. The Eurostar from Waterloo International in London and from Gare du Nord in Paris come to Lille. The old train station is close to the Eurolille station. Trains serve both stations. Lesquin Airport (obviously in Lesquin) is close to Lille but poorly served. Before the advent of the Channel Tunnel, there were flights to LHR, but no more. A flight to Algeria, some to Nice, and a few far away French cities and that's it.
Parking in Lille is not too difficult. It's a bit hard to find in the city center, but not impossible.

I arrived to the airport of Lille (http://www.lille.aeroport.fr/) but as I said before, if you're in UK, France, Belgium, the Netherlands, Luxembourg...) you can arrive by one of the modern high-speed trains. Remember that Lille is in the center of a very dense population area, with a very useful net of transports.

Rail - easily accessible from the UK.

The best way to travel into Lille is by train. Since Lille is very central between Brussels, London, and Paris, it only takes a few hours from all these locations by TGV. From Paris, one need take a train from the Gare du Nord. From London and Brussels you need to take the TGV main trains.
The best way to get around Lille is by riding the metro. The metro is cheap, easy, and fast. It is a much smaller and less complex system than that of Paris, London, or New York for example. There are only two lines. To ride the metro you must buy and compost a ticket before you board. I would suggest buying day passes for the metro if you'll be hopping on and off frequently. These cost much less than if you had to buy a seperate ticket each time. You can buy these on any of the automated machines in the metro stations.
The bus system is also well used and organized in Lille, but I found it more confusing than the Metro. And of course there is always a lot of walking involved, my favorite form of transportation. :)
The photo shows a few of the main attractions in Lille and the map of the centre ville.

Travel within Lille is also made easy, as there are a number of ways of getting around. The most popular method is the Metro. There are two metro lines in Lille linking many of the quartiers. The metro is also reasonably priced with a single journey costing 1,15 euros and a day ticket 3,35 euros.
The metro runs from 5.30 in the morning (6.30 on Sunday) until 12.30 at night.
Other travel options around Lille are by tram and bus and the tickets for these are the same as the Metro.

Not only the new station Lille Europe is worth seeing, also the old station Lille Flandres is wonderful. Most trains from Belgium and the North of France arrive here. It is only 10 minutes walking from Lille Europe, next to the large shopping mall and close to the city center. The metro has a stop under the station.