Join Date: Nov 2018
Location: Istanbul, Turkey
Programs: TK Elite Plus,BAEC GGL,ITA Executive, AFKL Gold,QR Gold,HH Diamond,Bonvoy Gold,ALL Gold
Posts: 14,186
In addition to what TPJ mentioned in the previous post,
Cash upgrades usually appear 48-72 hours before departure rather than far in advance and the only way to upgrade in cash far in advance is to pay the fare difference.