Southwest Airlines Sale with Up to 40% Discount, Book by Sept 17

Southwest Airlines Sale, Save Up to 40%

If you’re looking for an excuse to book your next getaway, Southwest Airlines has just the deal for you. The airline has launched a new fare sale, offering up to 40% off base fares. You need to book by September 17. Let’s go over the details of this latest Southwest Airlines sale.

Offer Details

Southwest Airlines is offering a sale with up to 40% off base fares. No promo code required.

• Save up to 40% off base fares
• Book by September 17, 2026
• Fly between October 5, 2026 – March 3, 2027

Travel dates and restrictions vary by route:

• Continental U.S travel blacked out October 12, November 20-November 25, November 28-November 30, December 18, 2026-January 4, February 12, and February 15, 2027.
• Continental U.S. travel to international, Hawaii, St. Thomas, and Puerto Rico blacked out November 19-25, and December 17, 2026-January 5, 2027.
• Continental U.S. travel from international, Hawaii, St. Thomas, and Puerto Rico blacked out November 27-December 1, and December 17, 2026-January 5, 2027.
• Continental U.S. travel valid Mondays, Tuesdays, Wednesdays, Thursdays, Fridays, and Saturdays.
• Travel from continental U.S. to Hawaii, St. Thomas, and international is valid Sundays, Mondays, Tuesdays, and Wednesdays.
• Travel to continental U.S. from Hawaii, St. Thomas, and international is valid Tuesdays, Wednesdays, Thursdays, and Fridays.
• Travel to/from Puerto Rico is valid Mondays, Tuesdays, Wednesdays, and Thursdays.

The discount applies to the base fare only and does not include taxes and fees. Availability is limited, and not all routes or travel dates will qualify for the full discount. While selecting your flights, savings in the base fare will be visible as a strike-through of the original fare on eligible flights.

BOOK NOW

Important Terms

• Up to 40 percent off promotion savings valid for qualifying one-way or round trip fares booked on Southwest.com® or swabiz.com from September 14, 2026 at 12:01 a.m. Pacific Time (“PT”) through September 17, 2026 11:59 p.m. PT (the “Booking Period”), and flown between October 5, 2026-March 3, 2027 (the “Travel Period”).
• Promotion code savings are applied before government taxes and fees.
• Discount availability may vary by destination, flight, and day of the week, and won’t be available on some flights that operate during very busy travel times and holiday periods. 

Southwest Airlines Sale: Guru’s Wrap-up

This can be a good opportunity to save on your next trip. Head to Southwest Airlines’ website and book now to lock in up to 40% off your base fare. This is also a good time to check your current bookings, and see if you can rebook and save.