The Avenue Verte is the official London to Paris bike route, connecting the London Eye to Notre Dame.
Distance:
398km via Beauvais and Senlis
462km via the Epte Valley and the Vexin regional park
Difficulty: Relatively easy with the odd hilly stretch.
Download the full GPX file
While there are many do-it-yourself London to Paris adventures to be had on a bike, the Avenue Verte is the official signposted one. There are two route options – both outlined in more detail here.
London to Paris guidebook with options via both Dieppe and Calais
More on cycling in Normandy
more on cycling in Paris