Let me start by saying that I am not taking credit for these offers.
There was a very hot deal earlier this week (http://hotukdeals.com/forums/showthread.php?t=233960) that many people used to get very low fares for return trips to the USA (£130 to £180)
Most using the thread used expedia.com.au to get the prices however they were also advised to use Orbitz.com The original thread has been expired because most of the deals from Expedia have now gone. When I complain to the moderators that the Orbitz links are still working, I am told that Orbitz should be started as a new deal.
So credit to dxb83 for the original thread.
Prices are quoted in US dollars, use http://www.xe.com
to get current conversion rates.
Deal I priced up this afternoon, London to San Francisco in May half term for £197 per person and that leaves on the Saturday! Better prices may be available for mid-week travel.