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

Frontier has released a new 12% discount voucher that is valid until midnight Thursday. To redeem this offer, just book your flights at the airline’s website and enter the promo code HITTHEBOOKS.

These are the rules:

– You can fly August 20 through December 12.

– No travel November 21-26 or November 29 – December 1.

– 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 July 17.

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