Originally Posted by
desidivo
Once you get to gold, United allows you to change your flight but only 24 hours out. So if you booked a ticket for Friday, you could change it to Sat.
Same-day change requires availability in the same fare bucket. A ticket for Friday
might be changeable to Saturday for no additional money. If same bucket not available, a $200 change fee and fare difference will be due.
Edit: My bad - fare difference applies.