One of the essential ways to save on airfare from Portland to Guangzhou is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 86% on airfare.
Leaving on a Friday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 325% on the overall cost on flights from Portland to Guangzhou.