Southwest Airlines just dropped a flash sale, offering up to 40% off base fares! This is huge for budget travelers and anyone planning trips between December 3, 2025, and March 4, 2026. To snag the deal, use the promo code 40SALE when booking by October 23rd. Why should you care? Well, if you've got upcoming travel plans during those dates, now's the time to check Southwest's prices and potentially rebook at a lower rate. Even better, if you have a Chase credit card that offers extra rewards or discounts at Southwest, you can stack these deals for maximum savings! Keep in mind that "up to" 40% off might not apply to every flight, but it's definitely worth a quick search to see if you can save some serious cash on your next adventure. Don't delay, the sale ends soon!