Changes to the Southwest plus size policy will soon impact travelers who need more space. Starting January 27, 2026, the airline will require passengers who do not fit comfortably in one seat to buy an adjacent seat in advance. Refunds will be available under specific conditions, but the long standing practice of obtaining an extra seat at the airport without prepayment will cease. This update coincides with the airline’s move to assigned seating, replacing its classic open seating model.
Key dates and requirements
Southwest airlines passenger planes at terminal at Portland International Airport (PDX) | Photo: Around the World Photos / Shutterstock.com
The new rules start on January 27, 2026, the same day assigned seating begins systemwide. Under this policy, travelers who cannot fit within a single seat’s armrests must purchase an adjacent seat at booking. This updated approach prioritizes advance planning, reducing reliance on the day of travel discretion that once helped customers secure extra space for free.
Refund eligibility explained
Refunds for the extra seat are still possible but depend on three conditions. First, the flight must have departed with at least one empty seat. Second, both seats must be bought in the same fare class on the same reservation. Finally, any refund request must be made within 90 days of travel. These requirements introduce new limitations compared to the past practice of nearly automatic refunds for a second seat purchase.
How seating needs are defined
Empty seats on a Southwest airlines plane. | Photo: Red Herring / Shutterstock.com
Southwest uses a simple measurement to decide if an extra seat is needed. If a traveler cannot fit between the armrests of one seat without intruding on another passenger’s space, a second seat is necessary. This guideline is similar to many airlines, but with assigned seating, the process becomes more structured and less flexible than before.
What happens without advance purchase
Failing to buy an adjacent seat ahead of time could mean rebooking on a full flight, as space may be unavailable at the airport. Booking two seats upfront guarantees space and also helps meet the criteria for a potential refund later if conditions are met.
Why the airline is changing course
These adjustments are part of Southwest’s broader strategy. The shift to assigned seating requires more formal rules for situations that previously depended on last minute availability. By standardizing the process, Southwest aims to reduce confusion, improve revenue management, and set clearer expectations for travelers and staff alike.
Booking tips for travelers needing two seats
- Purchase both seats in the same fare class on one reservation to simplify refund eligibility.
- Book early to secure better placement and lower the risk of a full flight.
- Submit any refund requests within the 90 day window, and keep all receipts and confirmation numbers handy.
- Review assigned seating maps during booking to better understand the cabin layout and options available.
Traveler concerns
Southwest Airlines Boeing 737-700 | Photo: Angel DiBilio / Shutterstock.com
Advocacy groups for larger passengers have raised concerns about the financial burden and potential stress of managing extra seat requirements. Critics note that while a refund process exists, it creates hurdles and uncertainty compared to the old system. Southwest states that buying an extra seat in advance is the most reliable way to ensure comfort and prevent travel disruptions.
Bottom line for travelers
The new system highlights the need for planning ahead. Buying two seats when needed provides certainty and protects against last minute problems. With proper booking and timely refund requests, travelers can still control costs effectively.
As the Southwest plus size policy begins alongside assigned seating, the best approach is to prepare early, maintain detailed records, and stay updated on airline guidance.