Airline ticket prices can vary due to a number of circumstances (season, booking date, etc.) more so as this is a peak season for air travel.

We paid also 6K+ per head for a MNL-TGL-MNL PAL flight before since I only booked a few weeks before my actual flight date, but upon further checking - if I book 2-3 months in advance online the price is much cheaper.

Though nothing beats MNL-HKG-MNL CebPac flight that I just got for 2.9K per pax.