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

Return flights

19 Sep - 28 Sep	Air Canada
21 Sep - 01 Oct	Philippine Airlines
07 Sep - 01 Oct	Philippine Airlines
28 Sep - 26 Oct	Philippine Airlines
17 Sep - 24 Sep	Philippine Airlines
09 Sep - 10 Oct	Korean Air
08 Sep - 16 Sep	Air Canada
01 Sep - 10 Sep	Air Canada
01 Sep - 23 Sep	Korean Air
30 Sep - 28 Oct	Korean Air
09 Sep - 10 Oct	ANA	direct
02 Sep - 16 Sep	ANA	direct
21 Sep - 01 Oct	ANA	direct
01 Sep - 23 Sep	ANA	direct
02 Sep - 23 Sep	ANA	direct
16 Sep - 22 Sep	Korean Air
01 Sep - 10 Sep	ANA	direct
07 Sep - 02 Oct	ANA	direct
23 Sep - 07 Oct	Delta	direct
26 Sep - 26 Oct	Philippine 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.

Book a cheap hotel in Tokyo

Cheap car rent in Tokyo

Cheapest return flights from Seattle to Tokyo in September from $669

Return flights