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

Return flights

24 Sep - 02 Oct	Delta	direct
29 Sep - 08 Oct	Delta	direct
21 Sep - 07 Oct	Delta	direct
29 Sep - 10 Oct	United
23 Sep - 28 Sep	Asiana Airlines
28 Sep - 16 Oct	Korean Air
28 Sep - 16 Oct	United	direct
15 Sep - 24 Sep	Asiana Airlines
29 Sep - 10 Oct	ANA	direct
14 Sep - 24 Sep	Philippine Airlines
22 Sep - 29 Sep	Delta	direct
21 Sep - 06 Oct	Delta	direct
26 Sep - 03 Oct	United
25 Sep - 28 Sep	Asiana Airlines
26 Sep - 29 Sep	Asiana Airlines
26 Sep - 06 Oct	Asiana Airlines
21 Sep - 25 Sep	Delta	direct
22 Sep - 26 Sep	Alaska Airlines
18 Sep - 22 Sep	Asiana Airlines
21 Sep - 23 Sep	United

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 534€

Return flights