[10/03/2018 @ 3:49 PM] Deal is back up.
United and Lufthansa has round-trip flights from Houston (IAH) to Amsterdam (AMS) for $468, NONSTOP. Flights from November to March. 8-day minimum stay required. Christmas / New Year blackout. Expect prices to fluctuate by +/- $15.
Note: Seat selection and carry-on bag are free, but checked bags will have a fee. Upgrades into “Regular Economy”, which include a “free” checked bag are available for +$45 each-way.
Note: This is a very good price for NONSTOP flights which normally cost about $1100.