I can't vouch for this for sure, but I'd recommend checking your flight online through southwest.com. If they're still selling tickets, it's probably not overbooked. Our return flight last March was listed on their website a few weeks before our trip, but was marked out so you couldn't select it and buy tickets. So, I assumed it was sold out, and was mentally prepared to jump at the chance to voluntarily be bumped if they asked. Sure enough they did ask for 3 volunteers, so my DH and my 2 DS volunteered to be bumped and received $300 vouchers each. They immediately placed them on another plane that was waiting for them and got home about 2 hours after me with a change of planes instead of non-stop like the original flight. I was able to go home and get unpacked before returning to the airport to pick them up. It worked out great and paid for our next trip!