Cheapest deals are to/from Denver, available on widely scattered dates (mostly late Aug. and Sept.).
Sample Frontier deals:
- Atlanta – Denver, from $101 one-way
- Chicago – Denver/Salt Lake, from $69/$104 one-way
- Dallas – Omaha, Salt Lake or Sioux Falls, from $104 one-way
- Denver – Kansas City, from $59 one-way
- Ft. Lauderdale – Denver, from $99 one-way
- Houston – Los Angeles, San Francisco or Spokane, from $119 one-way
- Las Vegas – Denver/Nashville, from $74/$96 one-way
- New York – Denver/Austin, from $99/$136 one-way
- San Francisco – Albuquerque, from $104 one-way
- Washington DC – Denver or Los Angeles, from $150 one-way
Book by May 20. Travel through Sept. 21 on a Tues/Wed/Sat only, with 14-day advance purchase. Blackout dates: July 6-8, Aug. 29-30, Sept. 2. See Frontier for more but don’t forget to compare prices at FareCompare, the home of the cheap flight.