American Airlines and United have round-trip flights from Houston (IAH) to Philadelphia or Los Angeles (PHL, LAX) for $139-$159, NONSTOP. Flights October to December. Departures on Monday, Tuesday, Wednesday, Thursday, and Saturday. Extended weekends available. Origin/Destination reversible. No Christmas dates available.
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.