As of 2026, you do not have to wear a mask on a Southwest Airlines flight. The federal mask mandate for public transportation in the United States was vacated in 2022, and Southwest—along with all other major U.S. carriers—moved to a "mask-optional" policy for both employees and passengers. While the airline continues to follow guidance from the CDC and TSA, wearing a face covering is now a matter of personal choice. Southwest emphasizes a "respectful environment" where those who choose to wear a mask for their own health reasons are supported, but there is no longer a legal or corporate requirement to do so. In 2026, the airline continues to utilize HEPA air filtration systems on all its Boeing 737 aircraft, which refresh the cabin air every few minutes. Unless there is a sudden and significant change in federal health regulations or local laws at a specific destination, you can expect to fly mask-free on all Southwest domestic and international routes.