Lille is a popular stop for all points in northwestern Europe and a transportation hub within France, so it's fairly easy to find plenty of opportunities for extended trips to other parts of the country. One of these are the WWII sites along the English Channel coast.
Trips to WWII sites from Lille usually take a few days, and that's for a couple of reasons. First, there is the schlep factor – you don't want to be getting in an out of the minivan and hustling from site to site on a deadline. Visiting the places where some of the defining events of the 20th century took place is overwhelming; the last thing you want to do is be in a stupor because you woke up at the crack of dawn to get there.
The other reason is that it is, in fact, a bit overwhelming. You don't have to be a history buff to be absolutely riveted by the narrative of the battles fought in the Normandy region of France. And many of the sites you visit on a WWII tour are cemeteries, which are understandably moving. You need a bit of time to take in the information as well the emotion, and process your experience.
As for the standard itinerary, Omaha Beach and the American Cemetery and Memorial are high on the list. There are also the British and Canadian landing and dropping zones; Dunkirk, famous for 'Operation Dynamo;' the Dieppe landings of 1942; and other sites along the way that played crucial roles in the direction of the war.
You can cobble together a road trip on your own, but a guided WWII tour is highly recommended. Today, many sites are nothing more than a beach or a field; while you could find them on a map, a guide will bring the places to life with detailed, factual stories, and can answer any and all questions you have.