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

Return flights

07 Sep - 23 Sep	Air Canada
02 Sep - 11 Sep	Alaska Airlines
01 Sep - 08 Sep	Korean Air
15 Sep - 26 Sep	United
03 Sep - 09 Sep	Air Canada
02 Sep - 16 Sep	United
01 Sep - 18 Sep	United
09 Sep - 23 Sep	United
10 Sep - 22 Sep	Korean Air
23 Sep - 14 Oct	Korean Air
02 Sep - 09 Sep	Air Canada
29 Sep - 06 Oct	Korean Air
24 Sep - 01 Oct	United
01 Sep - 08 Oct	United
26 Sep - 03 Oct	United
22 Sep - 01 Oct	Korean Air
26 Sep - 01 Oct	Frontier Airlines
26 Sep - 04 Oct	Frontier Airlines
21 Sep - 07 Oct	Alaska Airlines
24 Sep - 01 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 524€

Return flights