Chicago to Vegas: the lakefront to the Strip in one flight
Chicago to Las Vegas is 1,515 miles, about three and three-quarter hours westbound. Every cabin from a light jet up flies it non-stop, so the choice is about comfort and the size of the group, not range. Las Vegas is two hours behind Chicago: a noon departure lands at about 1.45 pm local time.
In Las Vegas there are three airports to choose from. Harry Reid is ten to fifteen minutes from the Strip. Henderson Executive is quieter, about twenty minutes from the south end of the Strip and closest to Henderson and Lake Las Vegas. North Las Vegas is the shortest drive to Summerlin, suits light jets, and almost always has space on a busy weekend.
This route peaks with the conventions. CES in January and the big autumn trade shows bring Chicago companies west in numbers, and the winter months add the weekend traffic of people leaving the snow behind. Book those dates a week or two ahead.