Frontier Airlines has posted yet another discount coupon — its third for the week. Until midnight you can save 13% on any fare. Just book your flights at the airline’s website and enter the promo code FRIDAY13.

These are the rules:

– You can fly March 17 – June 11.

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

– Sale fares are one-way only; round-trip purchase not required.

– Book flights by 11:59pm ET.

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