[01/02/2019 @ 5:30 PM] Still available.
Finnair and British Airways have flights from Dallas (DFW) to London or Paris (LHR/CDG) for $405-$499, NONSTOP. Flights January to May. 7-day minimum stay required. Flight may operate as a American/British Airways code-share.
Note: Cheapest flights are in January and February.
Note: Fare allows for a free carry-on bag, but checked bags will cost about +$55 each-way.