Well, don't look too much at the particular season. Be open to ideas as time goes on. Maybe around 4th of July, for example. And airline pricing is always changing. If you have a free weekend, ask what loads are like out here, and I'll take a look. Worst thing that can happen is that the flight is, in fact, full.

Also, our LHR flights tend to have seats. But there are also high departure taxes.