Delta's basic economy isn't too bad because they do allow a carryon bag in addition to your small personal item (purse, laptop bag).
Delta Airlines have a few round trip airfares travelling to and from Cincinnati (CVG) and Las Vegas (LAS) for $138, nonstop. This is a basic economy fare. On Delta, basic economy offers lower prices with some restrictions such as Seats assigned after check-in. No changes or refunds.
Departs CVG: Aug 14, 15, 18, 21
Returns: Aug 17-18, 21-25, 27-28
Departs LAS: Aug 8, 14, 18, 21
Returns: Aug 14, 15, 18, 21, 22, 25, 27, 28
Use dates and book it on Expedia [expedia.com]
. Bundling hotel with airfare will save money. And when searching for hotels in Vegas, be sure you check for a daily resort fee & parking that's not included in the rate. That's how the hotel get you.