If you're flying Southwest and think you may need a seat belt extender, the good news is that Southwest provides approved seat belt extenders free of charge on every flight. Simply request one from a flight attendant after boarding. There is no need to reserve one in advance.
This article summarizes Southwest's current published policies regarding seat belt extenders and customers requiring additional seating. Airline policies can change, so always verify directly with Southwest before traveling.
Southwest Seat Belt Extender Policy
Quick Summary
- Airline-issued extender available: ✅ Yes
- Personal extender permitted: ❌ No
- Advance reservation required: ❌ No
- Request onboard: ✅ Yes
- Exit row use permitted: ❌ No
- Second seat required if: Armrest standard not met
Southwest provides one airline-issued seat belt extender, free of charge, to any passenger who needs one. Flight attendants carry approved extenders on every aircraft and can provide one before, during, or after boarding.
Southwest's published policy is that passengers should use airline-issued seat belt extenders rather than personally owned extenders. Instead, the airline requires passengers to use extenders that are part of its own approved inspection and maintenance program. This helps ensure compatibility with the aircraft's restraint system and allows the airline to maintain inspection and maintenance records for the equipment being used.
Exit Rows - Seat belt extenders may not be used by passengers seated in an exit row. While exit rows tend to be more comfortable for those plus-sized passengers who need an extender because of the extra leg room, the Southwest policy requires the use of the aircraft's installed restraint system for eligibility to use these seats.
Practical Tip: If you're unsure whether you'll need a seat belt extender, simply ask a flight attendant after boarding.
Customer of Size / Extra Seat Policy
Importantly, needing a seat belt extender does not automatically mean you need a second seat under the airline's Customer of Size policy. These are separate policies evaluated independently.
The primary consideration is whether the passenger can safely occupy a single seat with both armrests lowered without encroaching on the adjacent seating area.
For reference, Southwest publishes the widest passenger seat width as approximately 17.0 in (43 cm) on the Boeing 737-700 and 17.8 in (45 cm) on the Boeing 737-800 and 737 MAX 8. While the Customer of Size policy is based on whether both armrests can be lowered—not on a specific measurement—these published dimensions may help travelers better understand the available seating.
Southwest's staff may also determine that an additional seat is necessary for safety reasons.
Under Southwest's current published policy, gate agents may provide a complimentary additional seat when adjacent seating is available.
Because availability cannot be guaranteed on the day of travel, Southwest continues to recommend purchasing the second seat in advance if you know you will require the additional space.
Additional Policy Details:
- Additional seats may not be purchased solely to keep the neighboring seat empty.
- If adjacent seating is unavailable, Southwest may rebook the passenger onto a later flight with appropriate seating availability.
- Travel involving partner airlines follows the partner carrier's own policies.
Recent Policy Changes
Southwest's Customer of Size policy changed significantly during 2026 as part of its transition from open seating to assigned seating.
Because of these changes, many older articles, travel blogs, forum discussions, and AI-generated answers no longer accurately describe the current policy.
If you encounter references to Southwest's former automatic refund program or the brief January–May 2026 advance-purchase requirement, they likely reflect policies that are no longer in effect.
Official Airline Policies
- Southwest Airlines — Extra Seat Policy
- Southwest Airlines — Customers of Size: Boarding & Airport Experience
Official policies last verified: August 1, 2026