Delta, Southwest, and American Airlines have round-trip flights from Dallas (DFW) to Detroit, Pittsburgh, Cincinnati, or Indianapolis (DTW, PIT, CVG, IND) for $131-$149, NONSTOP. Flights August to November. Most departures on Tuesday, Wednesday, and Saturday. Extended weekends available. No Thanksgiving dates.
A Carry-on bag and also a personal item is allowed for free on Delta. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.