Denver – Dallas (or vice versa) $78 RT on United Airlines (travel Jan-Mar) Nonstop.

United Airlines have roundtrip airfares to and from Dallas (DFW) and Denver (DEN) for $78 including taxes and fees. This is a nonstop flight.
mod note: this is $2 cheaper than ultra low-cost air carrier Frontier. This is not the "basic economy" fare that United will be introducing, which means your carry-on bag will still be free.
Travel Availability:
from DEN – Jan 24, 26-28, Feb 1-4, 9, 10, 15, 17, 18; Mar 3, 4
from DFW – Jan 24, 28, 30, 31; Feb 3, 5, 6, 13, 14, 19, 28; Mar 1
returns have wide availability based on departure date
Use the dates above and book it on Priceline , Orbitz , CheapOAir or directly with United
My sample travel dates: Jan 24-31, 2017 with Priceline