You always get $10 off roundtrip when you book on Spirit's site (compared to, say, booking on Travelocity or anywhere else, plus you don't pay the booking fee imposed by third party sites, so you save even more). But by entering 50OFF in the promo code box on Spirit's site between now and midnight ET tonight, you'll get an additional $40 off the usual $10 discount.
This offer is valid for travel between Mar 3 and Mar 31.
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