Fly nonstop from New York JFK to Amsterdam, Holland for $407 round-trip on Delta Airlines this Fall.
Searching on Delta.com, I was able to find flights departing JFK on Wednesday, September 19 and returning from AMS on Friday, September 28, 2018. Flights are available daily from late September through October 26th. There looks to be a 7-night minimum stay requirement to get this route at the listed price.
This fare books into Delta's Basic Economy fare bucket meaning that you will only be allowed carry-on luggage. If you wish to check a bag it will cost additional. The Gold Delta SkyMiles Credit Card from American Express will allow you to check your first bag free, for you and up to 4 people in your traveling party. That could mean big savings for a family of four.
Need a room in Amsterdam? Have a look at what's available on Hotelwatchdog for the mentioned travel dates listed.