By Editor , 18 September 2026 Southwest's 'Week of WOW' Sale Cuts Fares Up to 40% Through Sept. 17 Lead Image Dallas – September 17, 2026 -- Southwest Airlines kicked off its Week of WOW sale, offering up to 40% off base fares for flights booked by Sept. 17 for travel between Oct. 5, 2026, and March 3, 2027.
