Frontier just posted a 15% discount coupon that’s valid until midnight. To redeem the offer, just book your flights at the airlines’s website and enter the promo code WINTER15.

These are the rules:

– You can fly January 6 through February 28.

– Tuesday, Wednesday and Saturday flights only.

– Code is valid for both one-way and round-trip fares.

– Code is valid for both regular and sale fares.

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

– The code expires at 11:59pm PT tonight.

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