Jetstar Airways is currently having a post lunar New Year sale where you can get one way airfare at a cheaper price (eg.Manila, Philippines to Singapore for only $48). There are also available one way flights from Manila to various destinations in Asia via Singapore (eg.Kuala Lumpur, Jakarta, Beijing) and Auckland in New Zealand.
Jetstar Airways also offer Manila to Australia (eg. Manila to Darwin, Manila to Perth).
For the list of promos, fares, routes and travel periods please see details below:
Sale will end on February 3, 2012 at 23:59pm. Carry on baggage only for one way economy starter fare. If you want to have an additional checked baggage from 15 to 40kg there will be an additional fare of 9 to 70 USD. For those who will avail business class fares there will be allowance of 30kg checked baggage. Seats are subject for availability other Conditions apply.
* Got it from an email