southwest booking Airlines today to keep your travel dreams alive. southwest Airlines check in can be done in multiple ways reserving evidence number followed by appearance field, credit card number, last name of the passenger and destination field, ticket number followed by the origin field or the SkyMiles number followed by the departure field. Not just multiple ways, the airline also offers two platforms for web check- heft. The southwest Airlines web check in can be performed 24 hours before the flight departure through desktop website or the mobile app.