Choosing between Southwest and United Airlines depends on your travel priorities, whether you value affordability, flexibility, or premium perks. The better airline depends on your travel needs: Southwest excels for budget-conscious domestic travelers with perks like two free checked bags, no change fees, and a relaxed open-seating policy, making it ideal for leisure trips. United, however, shines for international travel and premium experiences, offering global routes through its Star Alliance network, assigned seating, and upgraded cabins (like Polaris business class). While Southwest wins on flexibility and customer service, United provides better long-haul comfort and elite status benefits. Choose Southwest for affordable, hassle-free U.S. travel, or United for international reach and premium amenities.