United and American Airlines have round-trip flights from Houston (IAH/HOU) to Denver (DEN) for $97-$121, NONSTOP (UA) or with connections (AA). Flights March, May, August, September, October, and November. Mostly weekdays. Origin/Destination reversible.
Note: Carry-on bag is allowed for free on American Airlines. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Note: United “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.
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).
Note: Be sure to check both “HOU” and “IAH” for availability.
Read More Cheap Flights: Houston to/from Denver $97-$121 r/t – United / American