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

Frontier will let you save 15% on the price of any fare booked before midnight Thursday. Just book your flights at the airline’s website and enter the promo code REFUND. These are the rules:

– You can fly now through June 12.

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

– No Friday or Sunday flights.

– 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 April 17.

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