Spirit Airlines will tip its hat to the Windy City this fall, celebrating 25 years at Chicago O’Hare with a deal that feels like a birthday gift for travelers. From now through October 12, you can snag 25-percent off base fares from ORD for one-way travel between October 20 and December 10 with the promo code 25PCT. The catch? The discount excludes certain fare classes (Y, B, and H) and doesn’t stack with other offers.

For Free Spirit members, Spirit is sweetening the deal: book a qualifying round-trip and earn 1,500 bonus points (one-way bookings get 750 bonus points). And if you haven’t joined the loyalty program yet, you can score 500 points just for signing up.

This tie-in with Chicago is more than promotional optics. Spirit first launched service out of O’Hare in 2000. The move u

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