San Francisco to Manila, Philippines is as low as $509 round trip flying Eva Air in September.
Asiana, another Star Alliance airline member has ticket prices in the $560s if you prefer a flight via Seoul, South Korea. Prices drop to $569 in mid-August, then $533 in early September through November. Then $533 prices return in January 2019.
Air China has similar fares to Asiana in the $560s.
The deal here is Expedia has a $24 ticket discount price on the $533 fare for Eva Airlines flights for a total $508.49 ticket price.
Eva Airlines Expedia ticket San Francisco SFO – Taipei TPE – Manila MNL – Taipei TPE – SFO
I do not see Expedia discount rates on Asiana $569 fares.