This fee is one of the more annoying features of traveling with a “legacy” carrier. One hundred dollars is already excessive, and $150 is even more so. Fingers crossed that no one else picks this up, or it will stick.
Picked this gem up on Flyertalk.com. United has increased the domestic change fee from $100 to $150 dollars. As of now, no other carrier has matched this change. Fingers crossed that they do not. I can remember when the fee was $25 dollars. It has increased over time to $100 dollars. Some carriers charge less, and Southwest has never charged a fee to change your reservation to my knowledge.