The current SQ 4-to-go deal is SGD$1200/pax (excluding tax). I think tax will be $300-400, so the flight ticket alone will be around $1500-$1600.
Finnair, KLM and Qatar flies to Europe for about $1000, but it is not a direct flight. Including tax, it will cost around $1400. I wont mindpaying a bit more for a direct flight if possible.
I am not sure how much will accomodation cost. However, the good thing is, Feb is considered an off-peak in Spain, so accomodation will be alot cheaper than peak period (i think peak starts around April or May).