What to do when due to any reason you miss your flight in the southwest? You must follow specific procedures in accordance with Southwest missed flight policy in order to be accommodated on a standby flight. You must alert the staff, give them an explanation of why you missed your flight, and then ask for a new flight. It can be beneficial to alert the airline staff as soon as possible about your missing flight. When you know that you will miss your flight, you can also let them know in advance. This will make it simpler for the airline to book you on a Southwest missed flight standby. If the airline is unable to book you on a standby flight or if your schedule conflicts with the flight that can accommodate you, you can choose to rebook your reservation.