Alternative Airlines has a better choice of flights to Manila.

Manila Airport is the home base of
Philippine Airlines which operates a network of flights to Manila from 18 domestic destinations and 25 international destinations in 12 countries across Asia, Middle East, North America and Oceania.
Flights to Manila on other airlines.
Alongside Philippine Airlines, over 30 international airlines operate flights to Manila, including the very popular service on Air Niugini to Port Moresby.
Flights to Manila - statistics
Manila Ninoy Aquino Airport has three terminals and 24,108,825 passengers arrived on flights to Manila in 2009.