I'm trying to change our flights home to an earlier flight time. When I checked the flights today there was an earlier time that shows as $120 which is close to what we paid for our original flights. However, when I log into my SW account and go to change flights - the price comes up as $146 and if I log out and pull up flights it goes back to $120. Is this normal for SW? I was hoping to switch to an earlier flight without having to pay a ton of money.