Southwest offers sales prices from/to many cities on Tuesday - Thursday every week for Wanna Get Away fares. The earlier you book your flight will be to your advantage for a discounted fare. Continue to check later Tuesdays to see if fare you have has been lowered. If it has go back in on "change flight" with your reservation number and change your flight to the one with the lower fare. You will not receive a refund but you will have a credit that can be used anytime within one year from the date you actually purchased your ticket.