We've found some amazingly low fares from the US to Dusseldorf, Germany for late August travel.
Charlotte to DUS is just $411 RT including taxes. Newark to DUS is $573 RT. Search for flights departing beginning August 27 or 28 from almost any airport served by Northwest, which is the airline behind this sale. Northwest now flies nonstop from Detroit to Dusseldorf ,which may be the reason these late summer fares are so reasonable.