You are permitted to bring almost any solid food item through security and onto a Southwest Airlines flight in 2026. This includes sandwiches, fruit, crackers, and even home-cooked meals. However, any "liquid or gel" food items—such as yogurt, peanut butter, hummus, or salsa—must comply with the TSA 3-1-1 rule (3.4 ounces or less) if they are in your carry-on. Southwest is famous for its own onboard snack service, which recently expanded in early 2026 to include Wonderful Pistachios for passengers in extra-legroom seats, alongside their standard pretzels and cookies. Because Southwest does not serve full meals, bringing your own protein-heavy snacks is a common "pro-traveler" move for longer hauls, such as flights between the mainland U.S. and Hawaii.