Distance from San Francisco to Manila (Not pH)

The question mentions "manila pH," but pH measures acidity, not distance. Assuming you mean Manila, Philippines:

The great-circle distance from San Francisco (SFO) to Manila (MNL) is approximately 11,200 km (6,960 miles). Non-stop flights take about 14–15 hours westbound; eastbound is faster due to tailwinds.

If you intended a different location, please clarify.