United and American Airlines have round-trip flights from Austin or San Antonio (AUS/SAT) to Denver (DEN) for $97-$117, NONSTOP or with connections. Flights April, May, June, August, September, October, November, and December. Weekends available. Origin/Destination reversible.
Note: Carry-on bag is allowed for free on American Airlines, but the route has a connection. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Note: United “Basic Economy” fares are NONSTOP but 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.
Note: The personal item size on United flights is smaller (9-in/10-in/17-in) than Frontier or Spirit (8-in/14-in/18-in).
Click for more details and booking links Cheap Flights: Austin or San Antonio to/from Denver $97-$114 r/t – United / American