Spirit, United, and American Airlines have round-trip flights from Austin (AUS) to Chicago (ORD) for $22-$79, NONSTOP. Flights November to February. Weekends available. Origin/Destination reversible.
Spirit fares are the “cheapest” but they don’t waive change fees, and they also charge bag fees. United fares waive change fees, but still charge a bag fee. American fares waive change fees, and allow for a free carry-on bag.
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