While searching for a holiday of my own I came across this deal. Absolute bargain to go to vegas for a few days considering flights alone are usually around this price per person!!
Date: 04-Feb-10 for 5 nights
From: Heathrow Via Houston
Airline: Continental Airlines
Best Western Mardi Gras
The Best Western Mardi Gras is ideally situated just a short walk away from the Main Las Vegas Monorail terminal. This full service hotel offers large and affordable guest rooms, with a relaxing pool area, whirlpool spa, sunning terrace and a shaded gazebo courtyard. With friendly, helpful staff and a complimentary shuttle service to and from the centre of the Strip, this is an ideal place to stay near the neon lights of Vegas!
You may be able to get deals from other airports but I haven't tried
Flying direct will cost an extra £70 per person from a quick check