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

Spirit has just posted a 15% discount coupon that is valid for today only. To redeem the offer, just book your flights at the airline’s website and enter the promo code 15PCT.

These are the rules:

– You can fly October 21 through November 20, December 2 through December 17, or January 6 through February 11.

– No Sunday flights.

– Round-trip bookings only.

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

– Some routes are excluded from this offer. Details on Spirit’s sale page.

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

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