AirHint found the following cheapest return flights from Portland (PDX) to Osaka (KIX) in September 2025 (see full year).

Return flights

05 Sep - 09 Sep	Air Canada
17 Sep - 25 Sep	Air Canada
08 Sep - 16 Sep	Air Canada
07 Sep - 20 Sep	Air Canada
01 Sep - 15 Sep	Air Canada
07 Sep - 17 Sep	United
17 Sep - 26 Sep	United
02 Sep - 09 Sep	United
01 Sep - 08 Sep	United

Also check the deals for one-way flights from Portland to Osaka in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Portland to Osaka in September from 521€

Return flights