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

Return flights

25 Sep - 29 Sep	Asiana Airlines
22 Sep - 01 Oct	Delta	direct
22 Sep - 07 Oct	Delta	direct
24 Sep - 07 Oct	Delta	direct
24 Sep - 02 Oct	Delta	direct
29 Sep - 08 Oct	United
29 Sep - 10 Oct	United
26 Sep - 05 Oct	Asiana Airlines
27 Sep - 10 Oct	ANA
23 Sep - 30 Sep	American Airlines
10 Sep - 21 Sep	Air Canada
28 Sep - 14 Oct	Korean Air
21 Sep - 24 Sep	Philippine Airlines
14 Sep - 21 Sep	Philippine Airlines
17 Sep - 22 Sep	Air Canada
28 Sep - 14 Oct	United	direct
23 Sep - 30 Sep	ANA	direct
21 Sep - 28 Sep	Asiana Airlines
15 Sep - 25 Sep	Asiana Airlines
18 Sep - 23 Sep	Asiana Airlines

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 $625

Return flights