Best place to find cheap International Flights?

I am looking for a multi-city flight and am having a hard time finding something within my budget.

I need to get from Toronto - Bangkok. (with as many connections and layovers necessary, this doesn't matter)

then 2 weeks later Singapore - Toronto.



Any suggestions?

Is it possible to do this for less than $2,000?



Kind Regards.Best place to find cheap International Flights?
farecast.com
lastminute.com try that maybe if you haven't already?Best place to find cheap International Flights?
I'm stumped on this one
I think fanecast.com