Originally Posted by
kuroko
actually U is also a pre-upgradable saver fare.
So a SIN-FCO-SIN in U/Saver is 838USD and a W/Flex is 1181USD // same for SIN-DXB-SIN U/Saver is 765USD and W/Flex is 1032USD.
So rather 35 percent more than double the price.
modified post accordingly

... what matters is extra between lowest available non saver fare to an upgradeable saver fare rather than percentage extra for flex over that in relation to the claim I would suggest