Delta has round-trip flights from Houston (IAH) to Minneapolis (MSP) for $121, NONSTOP. $61 each-way. Flights from May to November. Mostly on Tuesdays, Wednesdays, and Saturdays. A few Weekends available in September and November.
Note: Carry-on bag and personal item are allowed for free. Checked bags cost +$30 each-way. Seats are randomly assigned prior to boarding. Upgrades into “Regular Economy are available for +$30 each-way.