Southwest Updates Plus-Size Seating and Refund Rules: What Travelers Need to Know
Southwest Airlines is changing how it handles seating for larger-bodied travelers. Beginning January 27, 2026, the airline will require customers who need extra space to book an additional, adjacent seat in advance. Refunds for that extra seat will still be possible, but only under specific conditions. Here is a clear, respectful breakdown of what is changing, why it matters, and how to book smart so your trip goes smoothly.
What Is Changing and When
Southwest’s revised Customer of Size policy takes effect on January 27, 2026. From that date forward, travelers who do not fit comfortably within the armrests will be expected to purchase an extra seat before travel so the adjacent seat is guaranteed. This update arrives alongside Southwest’s move to assigned seating, which also begins for flights departing on and after January 27, 2026. Together, the changes shift planning from the gate to the booking stage and make seat availability the key factor.
How Southwest Defines When You Need an Extra Seat
Southwest uses the armrest as the boundary between seats. If you cannot lower both armrests while seated or your body encroaches on a neighboring seat, the airline considers you a Customer of Size and requires a second seat for comfort and safety. The expectation under the new rules is to reserve the extra seat next to you during booking so there is no last-minute scramble at the gate.
How Refunds Will Work Under the New Rules
You can request a refund for the cost of the extra seat after you travel, but three conditions must be met. First, the flight must depart with at least one open seat. Second, both seats must be in the same fare class. Third, you need to submit your refund request within 90 days of your travel date. If all three conditions are met, Southwest will process the refund of the second seat you purchased. If the flight went out completely full, a refund will not be issued.
If You Did Not Book an Extra Seat in Advance
Life happens, and sometimes you may arrive at the airport without having booked the additional seat. In that case, speak with the Customer Service agent at the departure gate before boarding. If the agent determines you need a second seat and there is space available on your flight, you will be accommodated with an extra seat at no additional charge. If the flight is full, you will be rebooked to a later departure with available seating. That can mean delays, so the surest way to avoid disruption is to purchase the second seat during booking when you know you will need it.
Why Southwest Says It Is Making This Change
Southwest is moving from its long-time open-seating model to assigned seats. Once specific seats are assigned, the airline has less flexibility to manage space at the last minute. Requiring the extra seat to be purchased ahead of time is intended to ensure the adjacent seat is actually available and to reduce day-of-travel conflicts at the gate and onboard. The airline’s approach shifts more planning to the booking stage but aims to make boarding more predictable for everyone.
Baggage and Other Policy Changes You Should Factor In
Southwest introduced checked-bag fees for most fares on reservations booked and ticketed on or after May 28, 2025. Benefits vary by fare type and loyalty status, and certain customers still receive one or two checked bags free. If you have relied on two free checked bags in the past, review your fare and benefits carefully so you are not surprised at the airport. These baggage changes, combined with assigned seating and the updated Customer of Size rules, mean it is more important than ever to know your total trip cost before you click purchase.
What Advocates and Travelers Are Saying
Advocacy groups and many frequent travelers point out that Southwest’s earlier approach made flying more accessible for larger-bodied passengers because it offered a clear path to comfort without a permanent extra cost. The new refund conditions introduce uncertainty, especially on busy routes that often depart full. Others note the update brings Southwest’s policy more in line with carriers that already require an advance purchase for extra space. Whichever perspective you share, the practical takeaway is the same: plan ahead, reserve the space you need, and keep documentation for any refund requests.
Step-by-Step: Booking If You Need an Extra Seat
- Book two adjacent seats together. Make sure both are in the same fare class.
- Keep your receipts and itinerary. You will need them if you request a refund.
- At the airport, preboard as directed. Southwest may provide a “Seat Reserved” marker for the adjacent seat to avoid confusion.
- After travel, submit your refund request. Do this within 90 days and be prepared to provide your confirmation number, flight details, and payment information.
- If you did not buy in advance, talk to the gate agent early. If space is available, you can be accommodated with a complimentary extra seat; if not, expect to be moved to a later flight with availability.
Tips to Minimize Stress and Costs
- Choose off-peak flights. Midday and midweek departures are more likely to have open seats, which can help if you are seeking a refund later.
- Compare fare types. A slightly higher fare class may include better change flexibility or baggage allowances that offset other costs.
- Arrive early. If you need help at the gate, extra time makes a difference.
- Set a calendar reminder for your refund window. Do not miss the 90-day deadline.
- Document everything. Save screenshots of your seat selections and your final boarding passes so you can demonstrate that the adjacent seat was reserved.
The Bottom Line
From January 27, 2026, Southwest will ask larger-bodied travelers who need more room to buy a second seat in advance and will refund that seat only when certain conditions are met. If you do not purchase ahead of time, you may still receive a complimentary second seat when space allows, or you may be rebooked if your original flight is full. With assigned seating arriving the same day and checked-bag fees introduced in 2025 for most fares, smart planning and careful reading of the fine print will help you avoid surprises and fly more comfortably.
