travel from Normandy to London?

Your choices are taking a ferry from Caen (Ouistreham) to Portsmouth and then to London or catching the Eurostar in Paris or Lille to London. We prefer taking the train to Paris for a night or two then Eurostar to London a day or two prior to our flight home. It all depends on whether you want to spend the days in Paris and/or London. If rushed you could do it in two days, one overnight stay, since most flights from London to the US leave no later than mid morning and getting there from Normandy would be a stretch IMHO. You could always fly to London from France but I don't know about connections, maybe others can help you out with flights.