If you call the
Southwest Customer Relations line in Dallas they can extend the expiration date one time. They will give you 6 months additional time to use the funds but they will take $50 off the value. It was a good deal for me since I would have lost $170 in funds, instead I kept $120. Hated to leave $50 but it was better than the alternative.
Give them a call at 214-792-4223 Mon - Fri, 8:00 am - 5:00 pm CT