The contributors of Flight-Report published 3 reviews on 1 airlines on the route London - Heathrow (LHR) → Las Vegas - Harry Reid (LAS). The airline with the best average rating is British Airways with 7.3/10. The average flight time is 10 hours and 43 minutes.
Airlines on this route are:
Frequent travelers recommend "British Airways Galleries First" at LHR for comfort and meals/catering.
London has an another airport to go to Las Vegas : London - Gatwick (LGW)