Join Date: May 2004
Location: SIN (LEJ once a year)
Programs: SQ, LH, BA, IHG Diamond AMB, HH Gold, SLH Indulged, Accor Gold, Hyatt Discoverist
Posts: 8,813
You don't mention the currency, but even if Euro, if there is really F included for FRA-SIN-FRA then that would be a pretty good deal on SQ. If it is on an A388 even the better though the ticket price for a 77W wouldn't be different, only the RBD (aka fare bucket) would impact the price which should be A or F.
Such fare deals can appear from some Scandinavian countries or at times Italy or so. YMMV