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

Return flights

01 Sep - 11 Sep	Asiana Airlines
07 Sep - 23 Sep	Asiana Airlines
08 Sep - 15 Sep	Asiana Airlines
22 Sep - 30 Sep	United	direct
07 Sep - 23 Sep	United	direct
01 Sep - 11 Sep	United	direct
07 Sep - 02 Oct	Delta	direct
08 Sep - 26 Sep	Delta	direct
09 Sep - 17 Sep	Delta	direct
07 Sep - 14 Sep	Asiana Airlines
01 Sep - 22 Sep	Asiana Airlines
19 Sep - 05 Oct	Philippine Airlines
20 Sep - 03 Oct	Delta	direct
27 Sep - 05 Oct	Korean Air
19 Sep - 05 Oct	Delta	direct
27 Sep - 05 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 613€

Return flights