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Frontier is offering $19 one-way fares on many of their routes! Flights are actually advertised as $24, but you can use code 5OFF to bring it down to $19. While the site doesn’t specify when this promotion expires, it does state that it is limited to the first 300,000 seats booked. Fares are valid for travel October 20 through December 16, 2015.
I randomly selected flights from Philadelphia to Chicago and see the $19 fares ($24 prior to the discount code being applied), almost every day of the month!
For those that are able to find a cheap fare, enjoy!