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Join Date: Feb 2010
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Thanks for the screen shot.
There is actually availability almost every day in December and January between Washington and London, not immediately around Christmas and New Year. Paris also has lots of options.
Have a look for WAS to LON first, find some options. Then check LON to CDG separately and see what works best. Then call BA to get it all on one booking.
If you want to save a bit of time, use rewardflightfinder.com, it takes you to the options more quickly, then go to BA.com. Search using WAS/LON/PAR rather than airport codes.