If you haven't noticed, BA is putting London on sale. I'm not sure about other BA's destinations. Here's are some sample prices. BTW the sale ends this Fri and weekend travels are extra $20 each way.

From NYC: $178
From PHL: $188
From IAD/BWI: $198

------------------
"It is not doing the things we like to do, but liking the things we have to do, that makes life blessed." - Goethe