From Frontier, here's another great little sale on nonstop flights to/from Denver. Travel is valid on Mondays through Saturdays, through February 13.

Fares include:

Omaha to Denver $86 round-trip, nonstop, including all taxes

Albuquerque to Denver $88 round-trip, nonstop, including all taxes

Kansas City to Denver $98 round-trip, nonstop, including all taxes

St Louis to Denver $98 round-trip, nonstop, including all taxes

Chicago to Denver $111 round-trip, nonstop, including all taxes

Indianapolis to Denver $116 round-trip, nonstop, including all taxes

Austin to Denver $116 round-trip, nonstop, including all taxes

Ft Lauderdale to Denver $144 round-trip, nonstop, including all taxes

Minneapolis to Denver $144 round-trip, nonstop, including all taxes

Orlando to Denver $148 round-trip, nonstop, including all taxes

Nashville to Denver $147 round-trip, nonstop, including all taxes