To save up to 12% on this flight, we recommend booking at least 16 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Appleton to Dusseldorf from $750 1-2 weeks out and tickets from $891 for flights departing within the next 72 hours.
Flights from Appleton to Dusseldorf lean towards being more expensive in August. Prices are generally better when you fly from Appleton to Dusseldorf in September, with the cheapest ticket starting at $410.