Originally Posted by
tarheelnj
Technically, there's always a buy-up. It could be the cost of a J ticket.
You can always upfare, but UA will
not always offer you a buy-up.
It's a dynamic situation. If you don't get offered a buy-up at check-in, or don't like the price offered, keep checking. Maybe it will change, maybe it won't. There is no work around.