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

Spirit is offering a flat $10 discount on any round-trip fare (with a few exceptions) booked at the airline’s website before midnight tonight. All you have to do is enter the promo code 10OFF when you select your flights, and your fare will be reduced by $5 in each direction. These are the rules:

– You can fly September 30 through November 25, December 3 through December 18, and January 7 through February 12.

– 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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