American Airlines has round-trip flights from Houston (IAH) to Las Vegas (LAS) for $122-$131 with a connection. Flights August to September. Extended Weekends available. Origin/Destination reversible.
Note: Carry-on bag is allowed for free on American Airlines. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Note: United has flights for a bit cheaper, nonstop, but the fare doesn’t allow for a free carry-on bag.