Update, 08/21: DEAD. The fuel surcharge has been restored.
The flight is being sold by Virgin Atlantic but it’s actually on USAirways.
The actual ticket itself is just $242! The rest are mostly the mandatory UK departure tax ($156) that applies to all LHR flights and other government taxes.
Virgin normally adds a fuel surcharge, though there is none on this ticket. This makes for a discount of about $430 compared to similar flights from NYC, about a 2 hour drive away.
This appears to be valid for departure starting 10/22 through 03/13
The cheapest departure days are Monday, Tuesday, and Wednesday and the cheapest return days are on Tuesday, Wednesday, and Thursday.
Seats are of course limited.
Check the Orbitz box to search “3 days before and after” to help find valid dates.