Seattle to Denver, CO for $77RT! (DIRECT)
Frontier is back at it again with their crazy low fares to Denver, Colorado. Lowest dates are in February but deals can be found into March and April for a few dollars more. Frontier is an ultra low cost carrier meaning only small hand luggage that fits under the seat in front of you is free. Normal sized carry on and checked luggage will incur fees. Be sure to read my article about flying with Frontier for luggage tips and more. Use the calendar view and book direct through FlyFrontier.com for the frugal fares!