It will increase weekly flights from three to five starting November 25 2025, due to strong demand, PAL says.
The Seattle service launched last October and represents the only direct air link from Seattle to the Philippines.
The added flights will operate on Tuesday and Thursday.
PAL and Seattle based Alaska Airlines have an existing codeshare and reciprocal loyalty arrangement.
This enables onward domestic US connecting flights via Seattle-Tacoma Airport for PAL customers.
PAL’s new flights will operate on Boeing 777-300ER aircraft with 370 seats.
The airline flies to New York, LAX, San Francisco, Honolulu, and Guam as well as Seattle.