Virgin Atlantic and SkyTeam partners have round-trip flights from Houston (IAH) to London (LHR) for $482-$498 with a connection. Flights from November to May. 7-day minimum stay required. Christmas Blackout. Expect prices to fluctuate by +/- $15. Flight may operate as a Delta/SkyTeam code-share.
Note: New Years is Available if you can do a 11-day stay or longer.
Note: Carry-on bag is allowed for free, but it will cost +$60 more each-way to check a bag.