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

Spirit is offering a discount voucher exclusively for MasterCard holders. You can save $24 on the price of a round-trip fare. Just use your MasterCard to book tickets at the airline’s website before midnight tonight, and enter the promo code MC24. These are the rules:

– You can fly August 21 through November 20 and again from December 4 through December 18.

– Round-trip purchase required.

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

– Certain routes are excluded from this offer — details on Spirit’s sale page.

– The code expires at 11:59pm local time tonight.

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