Agreed. This is because Cambodia is still a third world
country.
There are currently 2 ways of getting there from Singapore:
Royal Air Cambodge ( which i dun noe whether it flies any more, i
doubt it does , can someone confirm? ) to Phnom Penh and then
transfer internla flight to Siem Reap. Even if its flying, the
airfare is horrendously high, and u will most prob get a B737
classic / second generation ( -300 i think )
Silkair direct to Siem reap with stopover in Phnom Penh, i think,
or its Siem Reap all the way. Uses A319s or A320s, but prices have
to depend on promotions and market conditions.
There are other ways to go to Angkor Wat , which is near Siem Reap,
like going from Vitenam Hanoi. I recommend searching the travel
agents in People's Park Complex/centre for the lowest
airfare.
Priceline does not work well in such countries for weird
reasons.