AirHint found the following cheapest return flights from Seattle (SEA) to Tokyo (NRT) in September 2025 (see full year).

Return flights

08 Sep - 15 Sep	Asiana Airlines
04 Sep - 07 Sep	Asiana Airlines
07 Sep - 14 Sep	Asiana Airlines
01 Sep - 22 Sep	Asiana Airlines
07 Sep - 23 Sep	Asiana Airlines
01 Sep - 11 Sep	Asiana Airlines
02 Sep - 01 Oct	Asiana Airlines
08 Sep - 18 Sep	Hawaiian Airlines	direct
07 Sep - 20 Sep	Air Canada
09 Sep - 17 Sep	United
22 Sep - 30 Sep	Korean Air
07 Sep - 02 Oct	Air Canada
19 Sep - 05 Oct	Philippine Airlines
21 Sep - 07 Oct	United
27 Sep - 05 Oct	Asiana Airlines
24 Sep - 05 Oct	Air Canada
19 Sep - 05 Oct	Japan Airlines	direct

Also check the deals for one-way flights from Seattle to Tokyo 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 Seattle to Tokyo in September from 609€

Return flights