CAT 16 pointed to CAT 31 - Voluntary Changes
$300 is the answer
but appears you found that earlier
Originally Posted by
Mike Jacoubowsky
... A $300 cancel fee is less cheaper than two visits to a therapist.
Another approach is to call and ask
As far as the change time period -- yes it is from purchase . The only way to extend that is for UA to make a refundable change
Sometimes a ticket change will reset the issue date, this generally take more than a simple date change.