Air Asia is a budget airline based in Malaysia and currently has two destinations coming from Clark, Pampanga:
Kuala Lumpur and Kota Kinabalu
It's also the same airline where I was able to book round trip tickets to Kota Kinabalu for roughly 1,200 pesos all in! Their website is quite user-friendly and has convenient features such as early check-in, online shops, etc. Their was formed in 1993 and initiated low cost traveling in Asia.
To check out flight schedules, please log on to : http://www.airasia.com
Getting to Clark Airport is pretty easy as there are Philtranco buses coming from Pasay and Mega Mall Building A that takes you to the airport doors. They have aligned their trip schedules with the flights. You may buy your ticket two days in advance.
Bus Ticket Cost:
Coming from Pasay (It's across Cabrera St.) - 350 pesos
Coming from Mega Mall - 300 pesos
It's a bit hard to get through their hotline but buying bus ticket is a breeze.
Address: Edsa corner Apelo Cruz Street
*Earliest trip coming from Pasay is at 6:30AM; next I think is at 11:00am.
Another option is two ride a bus to Dau - more info provided here at my friend's blog:
*Will provide more info when I get back from my trip. :)