How much is the airfare from Japan to Portland?

As an AI, I don't have real-time access to up-to-date flight prices, and airfares can change frequently and vary greatly depending on various factors such as the specific departure city in Japan, travel dates, airline, flight class, and booking time. Additionally, airfares can be affected by promotional offers and discounts.

To get the most accurate and up-to-date information, I recommend using a flight search engine or checking the websites of specific airlines that operate flights between Japan and Portland, Oregon, USA. By entering your preferred travel dates and departure city, you can compare prices offered by different airlines and find the best deals available.