A Harley-Davidson Flathead averages €8,500 across all model years. Right now 1 are listed for sale, with the cheapest sitting around €8,500 (typically older years) and the priciest around €8,500 (recent years). The median is €8,500. A good price for a Harley-Davidson Flathead is under €8,500; anything over €8,500 is on the high side compared with similar listings. Selling to a dealer instead of privately usually means a lower price: expect roughly €6,375 to €7,650 for this model, depending on year and condition.