The airlines really do not recognize bereavement anymore. The best you can do is wait until things are set for the funeral, adjust accordingly, and hope for a sympathetic agent who might be willing to way the change fee (whilst still charging for the fare difference). Good luck and sorry for the circumstances.
Correction - seems like Delta does have a policy. See below.
Last edited by FlyingUnderTheRadar; Dec 11, 2017 at 8:47 pm