American Airlines has round-trip flights from Dallas (DFW) to Las Vegas, Denver, or New York (LAS, DEN, LGA) for $119-$133, NONSTOP. Flights May to November. Departures on Tuesday, Wednesday, and Saturday. Extended weekends available. Origin/Destination reversible. No Thanksgiving dates.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.