Southwest sale: Save up to 50% off base fares (& awards) with promo code MILLIONS

Southwest is running yet another sale that’s giving up to 50% off base fares, as well as a similar type of discount on award pricing when using promo code MILLIONS.

The Deal

• Save up to 50% on Southwest base fares when using promo code MILLIONS.
• Direct link to offer.

Key Terms

• Up to 50 percent off promotion code savings valid for qualifying one-way or round trip Basic and Choice fares booked on Southwest.com or swabiz.com from September 9 at 12:01 a.m. Pacific Time (“PT”) through September 12, 2025 11:59 p.m. PT (the “Booking Period”)”, and flown between September 30, 2025-March 4, 2026 for continental U.S. travel, September 30, 2025-March 4, 2026 for continental U.S. travel to/from international, Hawaii, and Puerto Rico, and February 2-March 4, 2026 for St. Thomas travel (collectively, the “Travel Period”).
• Interisland Hawaii travel is excluded.
• Continental U.S. travel blacked out November 21 through November 26, November 28 through December 1, December 19 through December 23, December 26 through December 29, 2025, January 2 through January 4, and February 16, 2026. Continental U.S. travel to Hawaii, international, St. Thomas, and San Juan, Puerto Rico blacked out November 20 through November 24, December 18, 2025 through January 6, and February 12 through February 15, 2026. Continental U.S. travel from Hawaii, international, St. Thomas, and San Juan, Puerto Rico blacked out November 28 through December 2, December 18, 2025 through January 6, and February 20 through February 22, 2026. Continental U.S. travel valid all days of the week. Travel continental U.S. to Hawaii, St. Thomas, and international is valid Sundays, Mondays, Tuesdays, and Wednesdays. Travel 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.
• Promotion code savings are applied before government taxes and fees. Enter promotion code MILLIONS in the Promo Code box when booking during the Booking Period.
• Seats, days, and markets are limited.
• If you have entered the promotion code MILLIONS in the Promo Code box on Southwest.com or swabiz.com during the Booking Period, then while selecting your flights, savings in the base fare will be visible as a strike-through of the original fare on eligible flights.
• 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.
• Discount is valid on new reservations only.
• Discount will apply only for select flights booked within the Booking Period, while supplies last, for travel flown within the Travel Period.
• Changes made to the itinerary after purchase will eliminate qualifications for this promotion and will result in forfeiture of any promotion code savings.
• The discount is only valid with the provided promotion code and is not combinable with other promotion codes or fares.

Quick Thoughts

It feels like these Southwest sales are increasing in frequency which is presumably bad news for Southwest’s load figures, but good news for anyone who needs to book flights with them in the next few days, provided fares didn’t get artificially increased in the meantime to compensate for this sale.

This is an ‘up to’ 50% sale, so you might not see any discount at all depending on your routes and dates, while if there is a discount it might not be quite as high as 50%.

As always with these types of Southwest offers, eligible flights using promo code MILLIONS will be discounted for both paid and award fares.

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