Grand Circle Travel visits Omaha Beach on their Seine river cruise. We toured several sites (WN60, the DDay Memorial, Sainte-Mère-Église, and Arromanches-les-Bains) in addition to Pointe du Hoc and the American Cemetery. It was a long day, but we’ll worth it.
ETA: Our visit was six or so years ago. The current itinerary can be viewed at https://www.gct.com/trips/river-cruises/europe/the-seine-paris-to-normandy/2021/itineraries?icid=global:itineraries:europe-by-river-cruise:river-cruises:sen