Is there a website that will list the KLM flights Ny to Amsterdam?

www.klm.com

If you are starting your trip from the US the KLM website will send you to the Northwest Airline website which is www.nwa.com., so you might as well go to nwa. You can put in the info and you will see the NWA and KLM flight info. Best wishes.

If it's your first time to klm.com, you'll be asked what country and what language. You can use Netherlands, UK, etc, just not the US, and you will stay at KLM's website.

If it automatically redirects you to nwa.com already, you can click on the KLM symbol in the top right, and it should lead you to the page where you can choose your country/language.

But as LoveItaly says, you can also just search NW's website for those flights.

You should find:
KL642/NW8642 from JFK daily
KL644/NW8644 from JFK except Monday
KL658/NW8658 from EWR daily

All KLM-operated flights. No NW metal for NYC-AMS.

BTW, KLM doesn't post the aircraft type on its timetable, but JFK uses the new 777-200 and EWR uses the 767-300.