FlyerTalk Evangelist
Join Date: Feb 2009
Location: From ORK, live LCY
Programs: BA Silver, EI Silver, HH Gold, BW Gold, ABP, Seigneur des Horaires des Mucci
Posts: 14,214
It is absolutely price discrimination, of the third degree. It offers the same service at a different price to different segments of the market, and in this case is offering a favourable price to customers who do not require flexibility and want to stay on weekends.
Note that price discrimination has a particular economic definition. Please google it if you are not familiar.