I got an email today that Frontier is offering a sale with one-way routes as low as $20 one-way. These types of sales happen fairly regularly across different airlines.
It looks like there is only one city pairs available for only $20 – Denver to Phoenix, but there are a variety of city pairs Here is a sampling from my hometown of Cincinnati (CVG)
Other routes are in the $20s such as Atlanta to Orlando ($24), Philadelphia to Raleigh ($26) or Denver to St. Louis ($29)
Different routes have different rules, restrictions and available dates, so check your route for the fine print. As a reminder, Frontier is a low-cost airline, so be prepared to pay for food, bags, seats etc. If you’re traveling Frontier with a family, check out these 6 tips for flying Frontier with a family but watch out for the huge problem flying Frontier
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Dan Miller travels with his wife and 6 (SIX!) children. He loves to help families travel for free / cheap, especially larger families. If you are looking for help, drop him an email at 
Watch out if anything occurs to hamper these flights as they may not be daily, and may be once per day. I avoid Frontier no matter the cost because everything adds up.