Update: this popular deal may have sold out. See more deals >

If you book by Thursday, Frontier will give you a 14% discount on the price of any fare. Just book your flights at the airline’s website and use the promo code JACK14. These are the rules:

– You can fly January 6 through March 13, 2014, any day of the week.

– The code is good for both one-way and round-trip bookings.

– The code is good for both regular and sale fares.

– The discount is taken from your base fare only; taxes and fees added separately.

– All normal fare rules apply.

– The code expires 11:59pm ET August 15.

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