Join Date: Jul 2002
Location: Still going through ORD security when boarding has already started
Programs: AA EXP, UA Silver, HH Gold, Bonvoy Gold, IHG Plat, Hyatt Disco, Reno Air MEGA Platinum
Posts: 10,311
tann's experiences sound about right.
Bereav. fares are typically 25% of full Y and are booked in Q class.
But the OP is asking about changing an existing ticket...