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

Return flights

29 Sep - 08 Oct	Frontier Airlines
29 Sep - 11 Oct	Frontier Airlines
17 Sep - 30 Sep	Air Canada
20 Sep - 06 Oct	Air Canada
30 Sep - 03 Oct	ANA
30 Sep - 08 Oct	ANA
29 Sep - 06 Oct	Frontier Airlines
22 Sep - 03 Oct	Air Canada
30 Sep - 10 Oct	ANA
27 Sep - 06 Oct	Asiana Airlines
27 Sep - 07 Oct	Asiana Airlines
20 Sep - 28 Sep	Alaska Airlines
24 Sep - 27 Sep	Air Canada
21 Sep - 28 Sep	Air Canada
22 Sep - 28 Sep	Air Canada
25 Sep - 30 Sep	ANA
28 Sep - 30 Sep	Korean Air
28 Sep - 30 Sep	ANA	direct
25 Sep - 30 Sep	ANA	direct
24 Sep - 27 Sep	ANA	direct

Also check the deals for one-way flights from Washington 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 Washington to Tokyo in September from $953

Return flights