To check in online for a Southwest Airlines flight, navigate to Southwest.com, and click the Check In tab at the top of the page. This opens a box with spaces for confirmation number, first name and last name. You can also access online check in from a Web-enabled mobile device.
The Check In tab is always accessible on the Southwest website, but the system only allows you to use it beginning 24 hours before your flight's scheduled departure time. Access to the online check-in process closes one hour before the schedule departure time. After accessing the Check In page, verify that the information is correct, and print your boarding pass. If you use a mobile device, print your boarding pass at an E-Ticket Check-In kiosk.