Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,170
The previous answer isn't very helpful.
VS do of course fly direct from Manchester to Las Vegas. Perhaps not daily but a couple of times per week. You can book one-ways ex-MAN and returns, but I see the same issue for LAS-MAN.
I can only imagine that there is an IT glitch (since you can buy cash tickets the route must be legal), so you should call Flying Club.
(as always, surcharges ex-USA are higher - even worse post Brexit / sterling devaluation - so keep that in mind)