On most modern airlines, flying standby occurs when a passenger travels on a flight without a prior reservation for that specific flight. A few standby seats are free, but most will cost you.Standby tickets are only valid between the same city pairs and on the same day for which the ticket was valid. To travel standby on South west, firstly purchase a Southwest Airlines ticket. Business Select and Anytime tickets allow travelers to change the time of the flight with a standby ticket for no additional fee. After that, check with the Southwest Airlines ticket agent at the departing airport. She will be able to convert your flight to a standby ticket. Then as a standby passenger, check in at the departing gate and wait for your name to be called. Before the flight departs, the ticket agent will determine any seats are available. At last, receive your boarding pass. If there are any seats on the departing flight, the agent will issue a boarding pass and you will be able to board.