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Southwest Airlines is offering a new promo code for up to 50% off the base fare of one-way or round-trip Basic, Choice, and Choice Preferred bookings made with cash or Rapid Rewards points. This offer is available for new reservations made by September 12, 2025, for travel between the continental U.S., Hawaii, Puerto Rico, the Caribbean, and more.
Here's what you need to know about Southwest's newest up-to-50%-off promo code.
Page Contents
Southwest Airlines Promo Code for 50% Off
Now through September 12, 2025, Southwest flyers can use the promo code “MILLIONS” to save up to 50% off the base fare of revenue or award flights. This sale applies to qualifying one-way or round-trip Basic, Choice, and Choice Preferred fares booked through Southwest channels.
That sounds great at first. However, travel is only valid on certain days of the week and there are lots of blackout dates, which can make it challenging to find a discounted fare that works for you. Plus, Southwest is known to avoid discounting its cheapest fares, which negates the value of the promo code.
Southwest promo code key details
- Promo code: MILLIONS
- Discount: Up to 50% off base fare (excludes taxes and fees)
- Book by: September, 2025, at 11:59 PM PT
- Travel period:
- Continental U.S.: September 30, 2025–March 4, 2026
- International, Hawaii, and Puerto Rico: September 30, 2025–March 4, 2026
- St. Thomas (STT): February 2–March 4, 2026
- Advance purchase requirement: None specified
- Blackout dates:
- Continental U.S.: November 21–26, November 28–December 1, December 19–23, December 26–29, 2025; January 2–4, February 16, 2026
- To Hawaii, international, St. Thomas, and Puerto Rico: November 20–24, December 18, 2025–January 6, 2026; February 12–15, 2026
- From Hawaii, international, St. Thomas, and Puerto Rico: November 28–December 2, December 18, 2025–January 6, 2026; February 20–22, 2026
- Days travel is valid:
- Continental U.S.: All days of the week
- To Hawaii, St. Thomas, and International: Sundays, Mondays, Tuesdays, and Wednesdays
- From Hawaii, St. Thomas, and International: Tuesdays, Wednesdays, Thursdays, and Fridays
- To/from Puerto Rico: Mondays, Tuesdays, Wednesdays, and Thursdays
- Route exclusions: Interisland Hawaii
- Eligibility: Valid on cash or Rapid Rewards bookings (Basic, Choice, and Choice Preferred fares only); discount applies to new reservations only; changes to the itinerary after purchase will eliminate promotion eligibility
- Where to book: Southwest.com or Swabiz.com
- Full terms and conditions
Southwest Airlines recently overhauled its fare structure and introduced fees for checked bags and seat selection. Make sure to review the full inclusions (or lack thereof) of your selected fare class before completing your booking.
Related: Remember to Reprice Your Flights and Hotels to Save Money. Here's How.
How Effective Is This Southwest Airlines Promo Code?
Southwest rolls out promo codes pretty frequently, but not every deal is a slam dunk. While these offers are often limited to higher-priced fares, that wasn’t the case this time. On most routes we tested, the “MILLIONS” code applied to the lowest-priced Basic, Choice, and Choice Preferred fares.
The biggest catch, though, is that it’s tough (dare we say impossible?) to find a true 50% discount. Still, there are solid savings to be had. Here are some sample fares and the percent discounts we’re seeing:
| Route | Lowest Cash Cost | Cash Percent Savings | Lowest Points Cost | Points Percent Savings |
|---|---|---|---|---|
| Los Angeles (LAX) to Las Vegas (LAS) | Basic: $32 Choice: $47 Choice Preferred: $77 | Basic: 34.7% Choice: 40.5% Choice Preferred: 44.6% | Basic: 2,500 points + $5.60 Choice: 3,500 points + $5.60 Choice Preferred: 6,000 points + $5.60 | Basic: 28.6% Choice: 41.7% Choice Preferred: 42.9% |
| Myrtle Beach (MYR) to Chicago (MDW) | Basic: $107 Choice: $125 Choice Preferred: $155 | Basic: 46.2% Choice: 46.6% Choice Preferred: 47.3% | Basic: 8,500 points + $5.60 Choice: 10,000 points + $5.60 Choice Preferred: 12,500 points + $5.60 | Basic: 46.9% Choice: 45.9% Choice Preferred: 46.8% |
| San Diego (SAN) to Honolulu (HNL) | Basic: $150 Choice: $177 Choice Preferred: $213 | Basic: 35.3% Choice: 36.1% Choice Preferred: 36.8% | Basic: 10,500 points + $5.60 Choice: 12,500 points + $5.60 Choice Preferred: 15,500 points + $5.60 | Basic: 38.2% Choice: 39% Choice Preferred: 38% |
How to Get More Southwest Points
If you've found something that works for you but need more Southwest points for a redemption, you can transfer Chase Ultimate Rewards to Southwest or convert Bilt Rewards Points at a 1:1 transfer ratio. AwardWallet data shows that transfers are typically instant. Alternatively, you can transfer several types of hotel points to Southwest, including Marriott Bonvoy points at a 3:1 transfer ratio:
While it won't help you with this promotion, you can stock up on Ultimate Rewards points by applying for the Chase Sapphire Preferred® Card (Rates & Fees), which is currently offering a 75,000-point bonus after you spend $5,000 on purchases in the first 3 months from account opening.
- Earn 75,000 bonus points after you spend $5,000 on purchases in the first 3 months from account opening.
- Enjoy benefits such as 5x on travel purchased through Chase Travel℠, 3x on dining, select streaming services and online groceries, 2x on all other travel purchases, 1x on all other purchases
- Earn up to $50 in statement credits each account anniversary year for hotel stays through Chase Travel℠
- 10% anniversary points boost - each account anniversary you'll earn bonus points equal to 10% of your total purchases made the previous year.
- Count on Trip Cancellation/Interruption Insurance, Auto Rental Collision Damage Waiver, Lost Luggage Insurance and more.
- Complimentary DashPass which unlocks $0 delivery fees & lower service fees for a min. of one year when you activate by 12/31/27. Plus, a $10 promo each month on non-restaurant orders.
- Member FDIC
- Rates & Fees
- 5X points on Lyft rides through September 2027
- 5X points on travel purchased through Chase Travel℠
- 3X points on dining at restaurants worldwide
- 3X points on eligible streaming services
- 3X points on online grocery purchases (excluding Target, Walmart, and wholesale clubs)
- 2X points on all other travel
- 1X point per dollar spent on all other purchases
Our Take
Southwest's new up-to-50%-off fare sale is yours to take advantage of through September 12, 2025. While there are deals to be found, the terms are a mile long — and the cheapest fares fall into the Basic category, which means they can't be changed. But if you want to test your luck, don’t forget to apply the “MILLIONS” promo code.
For rates and fees of the cards mentioned in this post, please visit the following links: Chase Sapphire Preferred® Card (Rates & Fees)
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