I just wrote about an Air France first class fare from the West Coast to London for ~ $1500 roundtrip. Incredible.
Dan’s Deals points out that this fare is available as a one way for $636 as well. And that’s especially useful.
Here’s San Francisco – Paris in Air France first class connecting to intra-European business class to London.
Here’s LAX – Paris in Air France first class, conneceting to intra-European business class to London.
Note that the Airbus A380 of course has Air France’s older first class cabin if that matters to you.
Since these are one ways, if you prefer your destination to be Paris consider just getting off there. Throwaway tickets always present the risk or challenge that in the event of irregular operations (eg Air France cancels the flight) they may decide to put you on a different routing, for instance buying you a non-stop on British Airways to London. It’s worth reading up on the usefulness and risks of throwaway ticketing.