United has round-trip flights from Dallas (DFW) to Chicago (ORD) for $59-$60, NONSTOP. Flights February to May. Weekends available. Origin/Destination reversible.
Change fees are waived, but United’s “Basic Economy” fares do not include a free carry-on bag. Only a personal item (like a small laptop bag) is free. Seats are randomly assigned for free prior to boarding. If you have the United MileagePlus credit-card, use the “free checked bag” perk.