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Spirit is offering two discount coupons for flights book on its website by 11:59pm ET. You can save $24 or 7.5% on the price of a round-trip fare. To redeem either coupon, just enter the relevant promo code when you book your flights.
To save $24, use the code 24OFF. You can fly September 4 through November 20. Details here.
To save 7.5%, use the code 7.5OFF. You can fly May 18 through June 11. Details here.
These codes are good for round-trip bookings only. The discount is taken from your base fare; taxes and fees are added separately. Don’t forget: both codes expire at midnight ET.