Various airlines on the Star Alliance network have roundtrip airfares travelling from Atlanta (ATL) to Amsterdam Netherlands (AMS) for $375-$410, depending on date, flight and airline. Athough the airfare is low, the stops and layovers are LONG so be aware of that. Some flights may even have more than 1 stop. But hey, if you have the time....
Departs ATL: Beginning May 11 thru the 23rd
Returns: May 18 - June 1
Use dates and book it on Priceline [priceline.com]
. On Priceline, use the "flexible dates" option to see what comes up for you and with which airline. You will get a better idea of what you want to choose by seeing the options it will pull up.
Two samples here using two different set of vacation dates.