Southwest has round-trip flights from Dallas (DAL) to Denver (DEN) for $89, NONSTOP. $45 each-way. Flights from August to November on Mondays, Tuesdays, Wednesdays and Saturdays. Origin/Destination reversible. No Holidays.
Note: Last year these were $49 round-trip. This year has been more expensive overall.
Note: You may find additional savings if you purchase your Flight+Hotel together as a package on Southwest Vacations.
Read More Nonstop Flights: Dallas to/from Denver $89 r/t – Southwest