Jetstar Airways Philippines is having seat sale where you can avail one way airfare ticket at a cheaper price, e.g. Manila to Singapore starting at 49 USD. One way flights from Manila to various Asian and Australian destinations (via Singapore) e.g. Jakarta, Kuala Lumpur, Perth, Melbourne, and Auckland in New Zealand are also available, starting at 79 USD.
There are also seat sale for those who plan to travel on selected destinations in Australia from Manila (e.g. Manila to Darwin, Manila to Cairns).
For the list of Jetstar Airways promos, fares, destinations, and travel periods please see details below:
Sale ends on 19th of February, 2012 at 17:59pm unless sold-out earlier. Sale may be extended. Carry-on-baggage only for one way economy starter fare. If you want to have an extra checked baggage from 15 to 40kg there will be an extra fare of nine to 70 USD. For those who will avail business class fares, there are allowance of 30kg checked baggage. Seats are subject to availability. Other conditions may apply.
* Got this from an email