[02/10/2017 @ 5:24 PM] Paris, Amsterdam and Rome are still available via Priceline, but It looks like all of the other fares were removed by BA/AA. We’re no longer seeing them in the system.
British Airways has round-trip flights from Houston (IAH/HOU) to many destination in Europe (Full list in post) starting at $392, with a connection. Flights in March to December. Expect prices to fluctuate greatly +/- $50.
Note: Prices are highest and availability is lowest in July and August.