Sril Lankan Airlines - one day sale (1 September, which is right now Sri Lankan time) is offering 35% off all fares for travel 15 october -10 December.
This gives a business class saver fare to Europe (I checked SIN-CDG) for SGD1600 a/i return (USD1280). With full flat beds ex CMB to Europe. (London more expensive with APD at SGD1900).
you'll have to check mileage earning.
other Asian starting points and European finishing ports available.