I have a ticket purchased from Seattle to Central Europe and I've decided to swap my flight dates to an earlier date. Before trying to use the change function on British Airways' website, I've decided to look up the same flight on Google Flights:
Given that my original ticket for April cost $1360, I've expected to be asked to pay $2000+ to change this flight. But lo and behold, the BA website actually let me change it for less than $300:
Why is this the case?