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Today only, Frontier Airlines cuts 20% off domestic flights via coupon code "CYBERSAVINGS" as part of its Cyber Monday Sale. (Click on "Use Promo Code" on the front page to use this coupon.) That's tied with our October mention as the biggest percent-off discount we've seen for flights on this airline. Blackout dates apply. Book this travel deal today for travel from December 6, 2014 through February 12, 2015.

A best bet: We found one-way fares starting from $30.80. This rate is based on departure from Dallas, TX, (DFW) with arrival in Memphis, TN, (MEM) on December 15. That's $4 off and the best price we could find for this this flight on another airline by $155.

All prices, dates, and booking details were valid at the time of publication.