American Airlines, Finnair, British Airways, Iberia and various other airlines have round-trip flights from Los Angeles (LAX) to London, United Kingdom (LHR) for $352, NONSTOP. Flights April, May, September, October, November, and January. Departures on Thursday, Friday, and Saturday. 7-day minimum stay required.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Click for more details and booking links Nonstop Flights: Los Angeles to London, United Kingdom $352 r/t [Apr-May, Sep-Nov, Jan] – American Airlines / Oneworld