A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 102,617
It will be expensive, but you *might* be able to save money if you ask after all "outbound" segments have been flown. I don't know what your destination is or whether the segment you want to change is part or the outbound or inbound journey. Unfortunately AF/KLM have no voluntary SDC/SDS concept.