In regards to airfare, I am still looking into it. Are you heading to Winnipeg? I am planning to buy a ticket to Vancouver only because my friend will get me a flight from Vancouver to Winnipeg separately. But the price for Vancouver to Winnipeg is ranging around CAD$300 (one way).
For the flight from Manila to Vancouver, at the moment am leaning towards PAL with the cost of USD$715 (tax, airport tax and travel insurance included already, original price $668 - only with tax). I was given an offer of USD$638 for Cathay-Air Canada - stopover in HK with a layover in HK of 12 hours (only with tax). The 12hrs layover put me off, that I wasn't keen on doing that for the difference of USD$30.
My problem was that I can't book online with PAL, it wasn't accepting my UK card (2x) already. So, I will try to go PAL office and see if prices are similar online and will try my card again. Otherwise, it's cash payment. So, I am still looking into other travel agencies. But I think if you got Philippine bank cards, you won't get any problems booking online.
There are also promotional flights at PAL, just around USD$500, be careful in booking that, it only has 1 pc of luggage. If you only need 1 then that is very convenient. A blog will come up for this soon, first, I need to get myself a ticket.
...hth