Southwest Airlines had a customer-friendly flight change policy, allowing passengers to modify their flights without incurring change fees. Passengers could log in to their accounts on the official Southwest website, locate their reservation, and choose the "Change Flight" option. While there were no change fees, passengers were required to pay any fare difference. The airline's flexibility extended to the "Southwest Same-Day Flight Change" option for Anytime and Business Select fares, subject to seat availability. Please verify the current policy on the official Southwest Airlines website or through their customer service, as policies may have changed.