British Airways, Finnair, and Iberia have round-trip flights from Dallas (DFW) to London or Amsterdam (LHR, AMS) for $452-$482, NONSTOP. Flights March, April, May, September, and October. Extended weekends available.
This seems to be in response to the Delta sale we mentioned earlier today. This is the lowest we’ve seen NONSTOP fares to London or Amsterdam in over a year (though we have seen cheaper 1-stop fares in the past).