If you look at the Virgin Atlantic web site you will see that they have posted the fares for Fall, Winter and early Spring to London. Be sure to read the fine print as it explains any additional taxes, surcharges, etc you have to pay. Particularly note the LA fares as there is a different
situation for surcharges, etc. from there. Also note that these are ONE WAY fares. They also list a deadline for booking which I believe was tomorrow. However, in my experience, they always extend these deadlines.( In light of the current economic situation, I cannot imagine a rush to book!!!) Bookmark this site and/or register if you want to keep up with their fare changes. I really have a feeling that they may well go lower esp. for the dead of winter (my favorite time to go!)
http://www.virgin-atlantic.com/en/us/specialoffers/usspecialoffers.jsp