A friend emailed me this. Great introductory prices if you can make a quick decision on a trip from Seattle or Denver to London!
Prices from Denver seem to be good through the fall starting in September. RT Denver to London is base price $478. Just booked for Thanksgiving break. But you need to pay for anything above you and a handbag $45 checked bag, $45 seat assignment, $45 meal. Take this into account. There is an economy plus that includes these for about $100 each way.