The best way to see the dates applicable to the fares is by using the Matrix ITA site. Then plug the dates into Kayak or whatever site to get the fares. I can't seem to pull up the flights on Philippine Air's site. I'm seeing this price ($738) for most of the year.
This price is on par with Jetstar's deal of $410OW however looking at similar dates it would cost you $961 using Skoot & Jetstar (w/o fees). However, note Philippine air prices INCLUDE baggage, seats, credit card fees, and food. None of the drip pricing that Jetstar does. Using Skidoo my total including everything is AUD$691.14.
Note that some of the flights go into Haneda and some into Narita. You can even go into 1 airport and out the other if that's your thing. February would be ski season over there.
Had a look at Cebu and the current fares for similar dates are $673 from Sydney to Manilla and $426RT from Manilla to Tokyo, not including baggage fees.
Credit to Australian Frequent Flyer with their quote:
Not yet on OzBargain!
Bugger, I'm going the week before.