Not sure where you will be flying from in the US.
I am in Alabama, round trip from BHM to MNL was about 1800 to 2000 for a flight that was around 24-26 hrs. There were some that were cheaper but I am not wanting a 43 hour flight with 12-14 hour layovers.
I found it cheaper to take a flight from BHM to SFO, then a 2 stop flight from SFO to MNL. In fact it was still about the same to take a non stop from SFO to MNL on Philippine Air.
Anyway check all search engines as well, Google filters out some available flights, I have found more accurate info on Edge.