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

Return flights

23 Sep - 30 Sep	Air Canada
16 Sep - 22 Sep	Air Canada
08 Sep - 21 Sep	Air Canada
07 Sep - 28 Sep	Philippine Airlines
10 Sep - 24 Sep	Philippine Airlines
21 Sep - 01 Oct	Philippine Airlines
15 Sep - 25 Sep	Air Canada
17 Sep - 26 Sep	Korean Air
03 Sep - 11 Sep	Korean Air
09 Sep - 16 Sep	Korean Air
01 Sep - 10 Sep	Korean Air
21 Sep - 01 Oct	ANA	direct
01 Sep - 08 Oct	United	direct
30 Sep - 14 Oct	ANA	direct
15 Sep - 01 Oct	Delta	direct
05 Sep - 03 Oct	Philippine Airlines
21 Sep - 11 Oct	Korean Air
01 Sep - 18 Oct	Asiana Airlines
05 Sep - 03 Oct	ANA	direct
21 Sep - 11 Oct	ANA	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 $653

Return flights