Cheap Ticket Flights

hi i am in desperate need of a flight from Manchester to los angeles from 22nd july to 21st August, i can be slightly flexible, it is really really imporant i go

i need two tickets, i am looking for tickets at 500 pounds each, i have been trying for a long time they are coming out at around 640 pounds return

please can anyone help or suggest what i can do or where else i can look?

thankyou very much

ps. i dont need a hotel

check : www.abctravel.com and airlinetickets.de ( click english at the top ) they usually ofer quite chep flights
the the US.

im a frequent flyer.