Not everything was that expensive. but the average price is still 300-400 with a layover and almost 600 direct... with, yes even coach tickets, getting as high as 1,200!
Expedia is showing $400 direct or $315 with some unpleasant routing. Is this unusually high for ORD-LAS?
That's about what I would have guessed based on recent trips. Alot of capacity has been cut at LAS including on this particular route.
It also depends greatly if there is something in town or not. A conference week drawing tens of thousands of attendees will obviously greatly affect demand.