Their interview is a two-step process where first round will be with the HR on the phone and the other will be at their HQ in Dallas. Both the rounds are identical in which they will ask a mix of behavioral and resume based questions. The process is not at all taxing and you should just make sure you are confident and know what you are saying.
I applied online. The process took 5 months. I interviewed at Southwest Airlines (Dallas, TX) in Mar 2018
Interview
Easy, conversation-like interview, took a while, applied in november, phone interview in January, flew me to Dallas for an in-person interview in March and got an offer the next day
I applied online. The process took 2 months. I interviewed at Southwest Airlines (Dallas, TX) in Jun 2014
Interview
Simple, behavioral, resume driven. They asked more about my previous work, project I did, challenges I faced, How can i help them,why southwest airlines. Which skills I have, do i have airline background, from when I can start